USACE / NAVFAC / AFCESA / NASA UFGS-07 52 00 (November 2008)
-----------------------------
Preparing Activity: NAVFAC Superseding
UFGS-07 52 00 (January 2007)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 07 52 00
MODIFIED BITUMINOUS MEMBRANE ROOFING
11/08
NOTE: This guide specification covers the requirements for modified bitumen
sheet roofing. Hot mopped asphalt, torch applied, hot air, and cold-applied
adhesive applications are included. Both SBS and APP modified bitumen membranes
are included.
Edit this guide specification for project specific requirements by adding, deleting,
or revising text. For bracketed items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in respective project, whether
or not brackets are present.
Comments and suggestions on this guide specification are welcome and should
be directed to the technical proponent of the specification. A listing of technical
proponents, including their organization designation and telephone number, is
on the Internet.
Recommended changes to a UFGS should be submitted as a Criteria Change Request
(CCR).
NOTE: APP systems are allowed for Army projects only. This guide specification
does not include the structural roof deck, insulation, or sheet metal fascias,
gravel stops, gutters, downspouts, or flashing.
Acids, hydrocarbons, oil, and cooking greases attack modified sheet roofing.
When these contaminants may be a problem on a roof, contact modified bitumen
sheet manufacturers for specific recommendations.
Coordinate this section with other roof system components specifications such
as rough carpentry, electrical, mechanical, insulation and sheet metal flashing,
and structure. Also coordinate this section with the criteria contained in
Unified Facilities Criteria (UFC) 3-110-06 DESIGN: ROOFING as it relates to
the specific project and Service Exceptions indicated therein.
Requirements for special conditions, including Hurricane force wind (uplift)
and seismic design considerations are included in brackets. References and
paragraphs which do not apply to specific projects should be deleted.
PART 1 GENERAL
1.1 REFERENCES
NOTE: This paragraph is used to list the publications cited in the text of
the guide specification. The publications are referred to in the text by basic
designation only and listed in this paragraph by organization, designation,
date, and title.
Use the Reference Wizard's Check Reference feature when you add a RID outside
of the Section's Reference Article to automatically place the reference in the
Reference Article. Also use the Reference Wizard's Check Reference feature
to update the issue dates.
References not used in the text will automatically be deleted from this section
of the project specification when you choose to reconcile references in the
publish print process.
The publications listed below form a part of this specification to the extent referenced. The publications are
referred to within the text by the basic designation only.
[AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)ANSI/SPRI ES-1(2003) Wind Design Standard for Edge Systems Used with Low Slope Roof Systems][AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)ASCE 7(2005; Supp 1) Minimum Design Loads for Buildings and Other Structures][AMERICAN SOCIETY OF SAFETY ENGINEERS (ASSE/SAFE)ASSE/SAFE A10.24(2006) Roofing - Safety Requirements of Low-Sloped RoofsASSE/SAFE Z87.1(2003) Standard for Occupational and Educational Eye and Face Protection][ASPHALT ROOFING MANUFACTURER'S ASSOCIATION (ARMA)ARMA 410BUR88(2001) Manual of Roof Maintenance and RepairARMA 460LSR97(2002) NRCA/MRCA Repair Manual for Low Slope Membrane Roof SystemsARMA PMBRG98(1998) Quality Control Guideline for the Application of Polymer Modified Bitumen Roofing][ASTM INTERNATIONAL (ASTM)ASTM C 1153(1997; R 2003e1) Standard Practice for Location of Wet Insulation in Roofing Systems Using Infrared ImagingASTM C 1289(2008) Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation BoardASTM C 208(2008a) Cellulosic Fiber Insulating BoardASTM C 552(2007) Standard Specification for Cellular Glass Thermal InsulationASTM C 578(2008b) Standard Specification for Rigid, Cellular Polystyrene Thermal InsulationASTM C 726(2005e1) Mineral Fiber Roof Insulation BoardASTM C 728(2005) Perlite Thermal Insulation BoardASTM D 1668(1997a; R 2006) Glass Fabrics (Woven and Treated) for Roofing and WaterproofingASTM D 1863(2005) Mineral Aggregate Used on Built-Up RoofsASTM D 2170(2007) Kinematic Viscosity of Asphalts (Bitumens)ASTM D 2824(2006) Aluminum-Pigmented Asphalt Roof Coatings, Non-Fibered, Asbestos Fibered, and Fibered without AsbestosASTM D 312(2000; R 2006) Standard Specification for Asphalt Used in RoofingASTM D 4073(2006) Standard Test Method for Tensile-Tear Strength of Bituminous Roofing MembranesASTM D 41(2005) Asphalt Primer Used in Roofing, Dampproofing, and WaterproofingASTM D 4402(2006) Viscosity Determination of Asphalt at Elevated Temperatures Using a Rotational ViscometerASTM D 4586(2007) Asphalt Roof Cement, Asbestos-FreeASTM D 4601(2004) Asphalt-Coated Glass Fiber Base Sheet Used in RoofingASTM D 4637(2008) EPDM Sheet Used in Single-Ply Roof MembraneASTM D 4897(2001) Asphalt-Coated Glass-Fiber Venting Base Sheet Used in RoofingASTM D 5147(2007b) Standard Test Methods for Sampling and Testing Modified Bituminous Sheet MaterialASTM D 6162(2000a; R 2008) Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using a Combination of Polyester and Glass Fiber ReinforcementsASTM D 6163(2000; R 2008) Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using Glass Fiber ReinforcementsASTM D 6164(2005e1) Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using Polyester ReinforcementsASTM D 6222(2002e1) Atactic Polypropylene (ARP) Modified Bituminous Sheet Materials Using Polyester ReinforcementsASTM D 6223(2002e1e2) Atactic Polypropylene (ARP) Modified Bituminous Sheet Materials Using a Combination of Polyester and Glass Fiber ReinforcementsASTM D 6298(2005e1) Fiberglass Reinforced Styrene-Butadiene-Styrene (SBS) Modified Bituminous Sheet with Factory Applied Metal SurfaceASTM D 6848(2002) Aluminum Pigmented Emulsified Asphalt Used as a Protective Coating for RoofingASTM E 108(2007a) Fire Tests of Roof Coverings][FM GLOBAL (FM)FM 4470(1986; R 1992) Class I Roof CoversFM P7825(2005) Approval GuideFM P7825c(2005) Approval Guide Building Materials][INTERNATIONAL CODE COUNCIL (ICC)ICC IBC(2006; Errata 2006; Errata 2007; Supplement 2007; Errata 2007) International Building Code][MIDWEST ROOFING CONTRACTORS ASSOCIATION (MRCA)CERTA(2003) NRCA/MRCA Certified Roofing Torch Applicator Program][NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)NFPA 241(2004) Safeguarding Construction,Alteration, and Demolition OperationsNFPA 58(2007; Amendment 1 2007; Amendment 2 2007; Amendment 3 2007; Amendment 4 2008) Liquefied Petroleum Gas Code][NATIONAL ROOFING CONTRACTORS ASSOCIATION (NRCA)NRCA Details(2003) NRCA Roof Perimeter Flashing Systems Construction Details for Class 1 Roof ConstructionNRCA RWM(2003) Roofing and Waterproofing Manual][SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION (SMACNA)SMACNA 1793(2006) Architectural Sheet Metal Manual, Sixth Edition, Second Printing][U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)29 CFR 1910Occupational Safety and Health Standards29 CFR 1910.12Construction Work29 CFR 1926Safety and Health Regulations for Construction29 CFR 1926.16Rules of Construction][UNDERWRITERS LABORATORIES (UL)UL 790(2004; Rev thru Oct 2008) Test Methods for Fire Tests of Roof CoveringsUL RMSD(2008) Roofing Materials and Systems Directory]1.2 DESCRIPTION OF ROOF MEMBRANE SYSTEM[S]
NOTE: Coordinate with Part 2 materials specification.
Where one membrane system is required for all roof areas, use the first paragraph.
Where different systems are required, use the second paragraph successively
and replace the open brackets with a description of the substrate(s) and area
of the building or project where each system is to be applied.
Specify the three-ply option including base sheet, interply sheet and cap sheet
when mechanical fastening of bottom ply is required either directly to nailable
deck or over insulation substrate and into nailable deck, and when perforated
base sheet is used. Otherwise, specify two-ply option including modified bitumen
base sheet and cap sheet.
Two-ply option may also be considered when the mechanical fastening of the modified
bitumen base ply is concealed in the finished base ply installation (i.e., no
exposed fasteners in the base ply prior to application of cap sheet such as
occurs in base sheets fastened only in the side lap area and where the overlapping
adjacent base sheet is torch sealed over the fasteners in the lap area).
One ply modified bitumen roof membrane must not be specified without prior Government
approval and only be considered for application on open air sheds or light storage
structures and ancillary buildings of little importance. One ply membrane includes
application of a single ply directly to deck or insulation substrate or over
mechanically fastened or perforated base sheets.
Specify SBS for all hot asphalt membrane applications. Torch applied and cold
adhesive applications may include either or both SBS and APP, selected based
on the specific application and service conditions intended. APP systems are
allowed on Army projects only.
Felt base sheet may be specified in a low to moderate service three-ply application.
Specify venting base sheet for application directly to new concrete deck and
over nailable lightweight fill substrate materials.
[Minimum [two-ply][three-ply] SBS [or] [APP] [modified bitumen roof membrane consisting of [modified bitumen
base sheet][fiberglass felt [venting ]base sheet] [,interply sheet] and cap sheet. Modified bitumen roof membrane
must be [set in hot asphalt][torch applied]][set in cold-applied adhesive].]
[[_____]: Minimum [two-ply][three-ply] SBS [or] [APP] modified bitumen roof membrane consisting of [modified
bitumen base sheet][fiberglass felt [venting ] base sheet] [,interply sheet] and cap sheet. Modified bitumen
roof membrane must be [set in hot asphalt][torch applied][set in cold-applied adhesive].]
All work must follow the NRCA RWM guidelines and standards stated within this Section.
1.3 SUBMITTALS
NOTE: Review Submittal Description (SD) definitions in Section 01 33 00 SUBMITTAL
PROCEDURES and edit the following list to reflect only the submittals required
for the project. Submittals should be kept to the minimum required for adequate
quality control.
A “G” following a submittal item indicates that the submittal requires Government
approval. Some submittals are already marked with a “G”. Only delete an existing
“G” if the submittal item is not complex and can be reviewed through the Contractor’s
Quality Control system. Only add a “G” if the submittal is sufficiently important
or complex in context of the project.
For submittals requiring Government approval on Army projects, a code of up
to three characters within the submittal tags may be used following the "G"
designation to indicate the approving authority. Codes for Army projects using
the Resident Management System (RMS) are: "AE" for Architect-Engineer; "DO"
for District Office (Engineering Division or other organization in the District
Office); "AO" for Area Office; "RO" for Resident Office; and "PO" for Project
Office. Codes following the "G" typically are not used for Navy, Air Force,
and NASA projects.
Choose the first bracketed item for Navy, Air Force and NASA projects, or choose
the second bracketed item for Army projects.
Government approval is required for submittals with a "G" designation; submittals not having a "G" designation
are [for Contractor Quality Control approval.][for information only.][ When used, a designation following the
"G" designation identifies the office that will review the submittal for the Government.] Submit the following
in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-02 Shop Drawings
Roof plan[[; G][; G, [_____]]] drawing depicting wind loads and boundaries of enhanced perimeter
and corner attachments of roof system components, as applicable
SD-03 Product Data
NOTE: Edit the product data submission requirements as necessary for the system
specified. Include bracketed requirements as applicable to the system being
specified (e.g., torch applied systems may not require asphalt in the installation).
Modified Bitumen Sheets[[; G][; G, [_____]]]
[Asphalt]
[Cold-Applied Membrane Adhesive[[; G][; G, [_____]]]]
[Fiberglass Felt[[; G][; G, [_____]]]
Primer[[; G][; G, [_____]]]
Modified Bitumen Roof Cement[[; G][; G, [_____]]]
[Pre-Manufactured Accessories]
Fasteners And Plates[[; G][; G, [_____]]]
Vapor Pressure Relief Vents
Sample Warranty certificate[[; G][; G, [_____]]]
Submit all data required by Section 07 22 00 ROOF AND DECK INSULATION, together with requirements
of this section. Include in data written acceptance by the roof membrane manufacturer of the
products and accessories provided. Products must be as listed in the applicable wind uplift
and fire rating classification listings, unless approved otherwise by the Contracting Officer.
SD-05 Design Data
NOTE: Coordinate with requirements of "Wind Uplift" paragraph. Include bracketed
requirement where non-rated systems may be permissible.
Wind Uplift Calculations[[; G][; G, [_____]]]
[Provide Engineering calculations, signed, sealed, and dated by a qualified Engineer validating
the wind resistance per ASCE 7, ASTM D 4073, and ANSI/SPRI ES-1 of non-rated roof system.]
SD-07 Certificates
Provide evidence that products used within this specification are manufactured in the United
States.
Qualification of Manufacturer
Certify that the manufacturer of the modified bitumen membrane meets requirements specified
under paragraph entitled "Qualification of Manufacturer."
Qualification of Applicator
Certify that the applicator meets requirements specified under paragraph entitled "Qualification
of Applicator."
Qualification of Engineer of Record
Certify that the Engineer of Record is fully qualified, competent, and currently licensed to
practice in the project jurisdiction.
NOTE: Include bracketed requirement when hot-mopped membranes are used or base
sheets are hot-mopped to non-nailable substrates.
[Bill of Lading
Submit bill of lading when labels of asphalt containers do not bear the flash point (FP), finished
blowing temperature (FBT), and equiviscous temperature (EVT).]
Wind Uplift Resistance[[; G][; G, [_____]]] classification, as applicable
Fire Resistance classification[[; G][; G, [_____]]]
Submit the roof system assembly [wind uplift and] fire rating classification listings.
SD-08 Manufacturer's Instructions
NOTE: Edit the manufacturers instructions submission requirements as necessary
for the system specified. Include bracketed requirements only as applicable
to the system being specified (e.g., torch applied systems may not require asphalt
in the installation).
Modified Bitumen Membrane Application[[; G][; G, [_____]]]
Flashing[[; G][; G, [_____]]]
[Temperature Limitations for Asphalt]
[Torches]
[Cold Adhesive Applied Modified Bitumen Membrane[[; G][; G, [_____]]]]
Base Sheet attachment, including pattern and frequency of mechanical attachments required in
field of roof, corners, and perimeters to provide for the specified wind resistance.]
Primer
Roof Cement
Fasteners
Ventilating Base Sheets
[Coating Application[[; G][; G, [_____]]]]
Cold Weather Installation [[; G][; G, [_____]]]
Include detailed application instructions and standard manufacturer drawings altered as required
by these specifications. [Include membrane manufacturer requirements for nailers and backnailing
of roof membrane on steep slopes.] Explicitly identify in writing, differences between manufacturer's
instructions and the specified requirements.
SD-11 Closeout Submittals
Warranty
Information Card
Instructions To [Government][Contractor] Personnel
Include copies of Material Safety Data Sheets for maintenance/repair materials.
Submit 20 year "No-Dollar-Limit" warranty for labor and materials.
1.4 QUALITY ASSURANCE
1.4.1 Qualification of Manufacturer
NOTE: Specify minimum five years manufacturer experience unless directed otherwise
by the Government
Modified bitumen sheet roofing system manufacturer must have a minimum of [5][_____] years experience in manufacturing
modified bitumen roofing products.
1.4.2 Qualification of Applicator
NOTE: Specify minimum three years as an approved contractor unless directed
otherwise by the Government
Roofing system applicator must be approved, authorized, or licensed in writing by the modified bitumen sheet
roofing system manufacturer and have a minimum of [five][_____] years experience as an approved, authorized,
or licensed applicator with that manufacturer and be approved at a level capable of providing the specified warranty.
The applicator must supply the names, locations and client contact information of five projects of similar size
and scope that the applicator has constructed using the manufacturer's roofing products submitted for this project
within the previous three years.
1.4.3 Qualification of Engineer of Record
[Engineer of Record must be currently licensed within the jurisdiction of the project.]
[Engineer of Record must be approved, authorized, and currently licensed by the state of [Florida][_____], and
have a minimum of five years experience as an approved Engineer for manufacturers of similar roof systems. Engineer
of Record must supply the names and locations of five projects of similar size and scope for which he has provided
engineering calculations using the manufacturer's products submitted for this project within the previous three
years. Engineer of Record must provide certified engineering calculations for:]
[Wind uplift requirements][in accordance with [Local and State codes]
ASCE 7,in accordance with International Building Code.
[Seismic requirements per [local] [and state] building codes]
[Seismic requirements per ICC IBC Chapter 16, Section 1608.3]
[Snow load requirements per ICC IBC Chapter 16 Section 1608.3 and Section 7 of ASCE 7]]
1.4.4 Fire Resistance
Complete roof covering assembly must:
NOTE: Specify Class B option only when Class A may not be attainable such as
membrane system application directly to wood deck. Provide justification/rationale
for Class B option with design submission
a. Be Class A [or B] rated in accordance with ASTM E 108, FM 4470, or UL 790; and
b. Be listed as part of Fire-Classified roof deck construction in UL RMSD, or Class I roof
deck construction in FM P7825.
FM or UL approved components of the roof covering assembly must bear the appropriate FM or UL label.
1.4.5 Wind Uplift Resistance
NOTE: Determine the required wind uplift resistance based on ASCE 7 wind loading
calculations or applicable building code requirements. The specified FM rating
incorporates a safety factor of 2 over the maximum calculated uplift pressure.
Therefore, a FM rating of 1-90 correlates to a maximum uplift calculation of
2.2 kPa (45 psf). When a rated system is specified, ensure the specified roof
system is capable of meeting the wind uplift resistance specified. Where non-rated
systems may be permissible, include the bracketed option.
Higher ratings are available if wind load calculations determine a need.
Complete roof covering assembly, including insulation, must be rated Class 1-[60][90][_____] in accordance with
FM P7825 and ASTM D 4073 capable of withstanding an uplift pressure of [2.85][3.59][4.31][5.03][5,75][6.46][_____]
kPa per square meter [60][75][90][105][120][135][_____] psf. Non-rated systems must not be installed[, except
as approved by the Contracting Officer].[ Provide wind load calculations and submit engineering calculations
with substantiating data to validate wind resistance of any non-rated roof system.] Base all Wind uplift calculations
on a design wind speed of [_____] km/h [_____] mph in accordance with ASCE 7, ASTM D 4073, or applicable building
code requirements.
1.4.6 Preroofing Conference
After approval of submittals and before performing roofing [and insulation] system installation work, hold a
preroofing conference to review the following:
a. Drawings, including Roof Plan, specifications and submittals related to the roof work
NOTE: Delete the following statement if the roof work is for a new structure.
[Field inspection and verification of all existing conditions, including all fire safety issues,
existing structure, and existing materials, including concealed combustibles, which may require
additional protection during installation.]
b. Roof system components installation
c. Procedure for the roof manufacturer's technical representative's onsite inspection and acceptance
of the roof structure, and roofing substrate, the name of the manufacturer's technical representatives,
the frequency of the onsite visits, distribution of copies of the inspection reports from the
manufacturer's technical representatives to roof manufacturer
d. Contractor's plan for coordination of the work of the various trades involved in providing
the roofing system and other components secured to the roofing
e. Quality control, (ARMA PMBRG98) plan for the roof system installation
f. Safety requirements
Coordinate preroofing conference scheduling with the Contracting Officer. The conference must be attended by
the Contractor, the Contracting Officer's designated personnel, and personnel directly responsible for the installation
of roofing [and insulation], flashing and sheet metal work, [[mechanical] [and] [electrical] work], other trades
interfacing with the roof work, designated safety personnel trained to enforce and comply with ASSE/SAFE A10.24
,[ Fire Marshall,] and representative of the roofing materials manufacturer. Before beginning roofing work,
provide a copy of meeting notes and action items to all attending parties. Note action items requiring resolution
prior to start of roof work.
1.5 DELIVERY, STORAGE, AND HANDLING
1.5.1 Delivery
NOTE: Include bracketed requirement when hot-mopped membranes are used or base
sheets are hot-mopped to non-nailable substrates.
Deliver materials in manufacturers' original unopened containers and rolls with labels intact and legible. Mark
and remove wet or damaged materials from the site. Where materials are covered by a referenced specification,
the container must bear the specification number, type, and class, as applicable. [Labels or bill of lading
for roofing asphalt must indicate asphalt type, FP, FBT, and EVT, that is, the temperature at which the viscosity
is either 125 centistokes when tested in accordance with ASTM D 2170 or 75 centipoise when tested in accordance
with ASTM D 4402.] Deliver materials in sufficient quantity to allow work to proceed without interruption.
1.5.2 Storage
Protect materials against moisture absorption and contamination or other damage. Avoid crushing or crinkling
of roll materials. Store roll materials on end on clean raised platforms or pallets one level high in dry locations
with adequate ventilation, such as an enclosed building or closed trailer. Do not store roll materials in buildings
under construction until concrete, mortar, and plaster work is finished and dry. Maintain roll materials at
temperatures above 10 degrees C 50 degrees F for 24 hours immediately before application. Do not store materials
outdoors unless approved by the Contracting Officer. Completely cover felts stored outdoors, on and off roof,
with waterproof canvas protective covering. Do not use polyethylene sheet as a covering. Tie covering securely
to pallets to make completely weatherproof. Provide sufficient ventilation to prevent condensation. Do not
store more materials on roof than can be installed the same day and remove unused materials at end of each days
work. Distribute materials temporarily stored on roof to stay within live load limits of the roof construction.
Maintain a minimum distance of 10.67 meters 35 foot for all stored flammable materials, including materials covered
with shrink wraps, craft paper and/or tarps from all torch/welding applications.
Immediately remove wet, contaminated or otherwise damaged or unsuitable materials from the site. Damaged materials
may be marked by the Contracting Officer.
1.5.3 Handling
Prevent damage to edges and ends of roll materials. Do not install damaged materials in the work. Select and
operate material handling equipment to prevent damage to materials or applied roofing.
1.6 ENVIRONMENTAL REQUIREMENTS
Do not install roofing system when air temperature is below 4.44 degrees C40 degrees F, during any form of precipitation,
including fog, or when there is ice, frost, moisture, or any other visible dampness on the roof deck. Follow
manufacturer's printed instructions for Cold Weather Installation.
[1.7 [TORCH][HOT-MOPPED ASPHALT] APPLIED [(HEAT WELD)] MODIFIED BITUMEN MEMBRANE SAFETY
NOTE: Retain the respective brackets and paragraphs indicating a "Torch Applied"
system from the following requirements when membrane or flashing is torch applied.
Retain the respective brackets and paragraphs indicating a "Hot-Mopped Asphalt"
application from the following requirements when membrane or flashing is hot-mopped
applied.
If a combination of both torch applied and hot mopped applied systems is used,
retain both sets of paragraphs and brackets.
1.7.1 Property Protection
Take all precautions necessary to prevent ignition of combustible materials during [torch application][hot-mopped
asphalt application] of roofing. Immediately call the fire department if a fire commences. Review all fire
safety procedures as outlined at the pre-roofing conference.
NOTE: The following two paragraphs apply to both torch and hot-mopped application
methods.
Install materials using the techniques recommended by CERTA NRCA/MRCA Certified Roofing Torch Applicator Program
available from the National Roofing Contractors Association (NRCA) and the Midwest Roofing Contractors Association
(MRCA} as endorsed by the Asphalt Roofing Manufacturers Association (ARMA) and the United Union of Roofers, Waterproofers
and Allied Workers. Application procedures must comply with NFPA 241, OSHA 29 CFR 1910 and 29 CFR 1910.12, 29 CFR 1926.16
, 29 CFR 1926 Subpart F.[, UL Fire Resistance Directory Volume No. 1, NRCA R&W Manual, and Florida Building
Code Volume 2004.]
Do not store flammable liquids on the roof.
NOTE: Torch Applied
Provide a minimum of two 10 liter 2.65 gallon containers of water and two fully charged minimum [9.072 kg 20
pound CO2][9.072 kg 20 pound ABC (dry chemical)] fire extinguishers in separate, easily accessible locations
on the roof and within [9.144 meters 30 foot][3.048 meters 10 foot] of each [torch work area][hot-mopped kettle]
at all times.
NOTE: Hot-Mopped Applied
No Asphalt/Tar Kettles are allowed on roofs. Locate kettles and supply LP-Gas Cylinders safely and secured per
NFPA 241 outside of the building's perimeter a minimum of 6.096 m 20 foot from the structure and any combustible
materials.
Maintain a minimum separation of 6.096 m 20 foot between LP-Gas Cylinders and kettle. Provide protective fire
retardant blanket barrier or shield between any building structure to a minimum height of 8 foot and a clear
surround distance of 2.44 m 4 foot if operations force placement of kettle within a distance of 6.096 m 20 foot
. Do not obstruct or place kettles or Cylinder storage within 3.048 m 10 foot of exits, means of egress, gates,
roadways, entrances. Locate kettles downwind and away from any building air intakes.
Provide a minimum of two portable fully charged [9.072 kg 20 pound CO2]
[9.072 kg 20 pound ABC (dry chemical)] fire extinguishers no closer than 1.524 m 5 foot and no further than 7.62
m 25 foot of horizontal travel distance from each kettle at all times while kettle is in operation, in easily
accessible and identifiable locations. Also provide [a minimum of one][two] multipurpose 2-A:20-B:C portable
fire extinguisher on the roof being covered or repaired.
Comply with the following safety procedures:
a. Fuel containers, burners, and related appurtenances of roofing equipment in which liquefied
petroleum gas is used for heating must comply with the requirements of NFPA 58.
b. Fuel containers having capacities greater than one pound must be located a minimum of 3.048
m 10 foot clear distance from the burner flame.
c. All LP-Gas Cylinders must be clearly labeled "Flammable Gas", and secured to prevent accidental
tip-over.
d. Check all pressure regulators and hoses prior to use for proper functioning and integrity.
e. Turn off fuel supply at LP Gas Cylinder when kettle is not in use.
f. Equip all kettles with a functioning temperature measuring device to ensure no heating in
excess of 10 degrees C50 degrees F below the flash point.
g. Provide covers, lid, or top which are close fitting, constructed of minimum No.14 manufacturer's
gauge steel, and can be gravity closed on all kettles.
h. Clean all roofing mops and rags free of excess asphalt and store safely away from all combustible
materials. Store discarded roofing mops and rags in a non-combustible container and remove
from site each day.
i. Position all pump lines handling hot asphalt securely and equip all pump lines with a shut-off
valve on each with a coupler which may be opened when lines are full. Do not subject pump lines
to pressures in excess of safe and recommended NRCA and ARMA working pressures. Station an
operator near the equipment to cut off flow and care for other emergencies while conducting
heating, pumping and application operations.
j. Asphalt/tar bucket used by roofers or workers in similar trades must be constructed of minimum
No. 24 gauge or heavier sheet steel and have a metal bail of no less than 6.35 mm 1/4 inch diameter
material. The bail is to be fastened to offset ears or equivalent which have been riveted, welded,
or otherwise safely and securely attached to the bucket. Soldered bail sockets are prohibited.
Position workers and other employees to avoid being struck by bucket or other roofing materials,
which may accidentally fall while being hoisted, lowered, or used in the roofing operation.
Provide safety barriers and caution signs at all skylights or other roof holes.
k. Do not use flammable liquids with a flash point below 100 degrees F (gasoline and similar
products) for cleaning purposes.
Do not use solid fuel or Class I liquids as fuel for roofing asphalt/tar kettles. Provide a minimum of one employee
fully knowledgeable of kettle operations and hazards to maintain constant surveillance during kettle operation
within a minimum distance of 7.62 m 25 foot of the kettle.
NOTE: Torch Applied and Hot-Mopped Applied
Check all fire extinguishers prior to commencement of work, and upon completion of the day's work, to ensure
fullness and operability.
Project supervisor must make daily inspections with the facility manager of all conditions and operations which
could present hazards during [torching][hot-mopped] applications and issue directives to address all such concerns
and items of the work and existing conditions.
Identify and protect all combustible roof components, possible fire traps, and hidden hazards. Seal off voids
or openings in the substrate with non-combustible materials prior to installing [torch-applied][hot-mopped applied]
materials in the area. Install protective fire retardant blankets and shields at building walls, eaves, parapets
and equipments curbs constructed of combustible materials within 0.9144 meter3 foot radius of the area of [torch
work][hot-mopped kettle] prior to commencement of the work.
When working around intakes and openings, temporarily disconnect and block to prevent [flame of torch][fumes
from kettle] from being drawn into the opening.[ Provide non-combustible shielding or flame guard protection
where gaps or voids occur in the construction in area of torch work.]
1.7.2 Fire Watch
NOTE: Torch Applied and Hot-Mopped Applied
All personnel on the roof during [torch application][hot-mopped application] must be properly trained to use
a fire extinguisher. Provide a fire watch for a minimum of [two hours after completion of all torch work][30
minutes after completion of hot-mopped kettle operations] at the end of each work shift. Maintain the fire watch
for additional time required to ensure no potential ignition conditions exist. [Utilize heat sensing meters
to scan for hot spots in the work.][For torch applications, provide and utilize a minimum of one certified heat
detection gun per torch for use during the fire watch to verify cool, safe and non-combustible conditions exist.
Provide a minimum duration fire watch of two hours conducted by personnel properly trained to survey the underside
of the roof deck (where possible) and the topside of possible smoldering elements.]
NOTE: Torch Applied
Do not torch in areas of poor and/or no visibility (curbs, corners, eaves, expansions joints, flashing, other
voids and small penetrations) which could allow a torch flame to ignite combustible material(s) hidden from view
or within the underside of the roof deck or building interior. Use cold finish applications in these areas whenever
possible and per manufacturer's printed instructions, NRCA 4002, MRCA R&NW manual for "cold adhered" materials.
NOTE: Torch Applied and Hot-Mopped Applied
Do not leave the rooftop unattended during breaks in work during a work shift. Walk and scan all areas of application
checking for hot spots, fumes, or smoldering, especially at wall and curb areas, prior to departure at the end
of each work shift. Ensure any and all suspect conditions are eliminated prior to leaving the site each work
shift.
NOTE: Torch Applied
1.7.3 Open Flame Application (Torch) Equipment and Personnel Safety
Only NRCA/MRCA CERTA certified roofing applicators are allowed to operate any torching equipment. Verify that
all such applicators maintain and are currently carrying a valid Certified Roofing Torch Applicator (CERTA) card.
NOTE: Torch Applied and Hot-Mopped Applied
All crew members must be trained in preventive measures for indirect and direct dangers and hazards associated
with roofing work, which include, but are not limited to the following:
a. Heat Stress: Wear light colored clothing, a hat for ultra-violet protection, and other
eye protective devices. Drink sufficient quantities of non-alcoholic, non-caffeine liquids.
Stage shifts for crew members to allow for breaks from heat and sun exposure without interfering
with work progress.
b. First Aid for Burns: Immediately call for an ambulance. Contact local Occupational Health
Services (OHS).
All crew members must wear correct personal protective equipment (PPE), including. but not limited to the following
items:
a. Long-sleeved shirts buttoned at the collar and cuffs,and must be made of non-flammable materials.
Polyester materials are not allowed.
b. Work boots covering ankles with rubber or composite soles.
c. Long pants without cuffs to extend over the top of the work boots, and must be made of non-flammable
materials. No polyester allowed.
d. Heavy leather gloves and/or flame retardant gauntlets which must be worn during all handling
of a torch, whether operating or not.
e. OSHA and ASSE/SAFE Z87.1 approved face shields, goggles and/or safety glasses to be worn
during torching and any other applicable roofing functions.
f. OSHA and ANSI approved hard hats.
1.7.4 Wind Conditions
Use side shields with all torching operations when winds are occurring to prevent flame distortion of end burners.
Use torch machine equipment with bottom shield plate to prevent flame spread on to roof deck and substrate.
When high wind gusts are present, notify the safety officer and cease all use of torching equipment until wind
conditions lower and authorization from the safety officer to proceed is received.
]1.8 SEQUENCING
Coordinate the work with other trades to ensure that components which are to be secured to or stripped into the
roofing system are available and that permanent flashing and counter flashing, per NRCA Details, and are installed
as the work progresses. Ensure temporary protection measures are in place to preclude moisture intrusion or
damage to installed materials. [Application of roofing must immediately follow application of insulation as
a continuous operation. Coordinate roofing operations with insulation work so that all roof insulation applied
each day is covered with roof membrane installation the same day.]
1.9 WARRANTY
Provide roof system material and workmanship warranties meeting specified requirements. Provide revision or
amendment to standard membrane manufacturer warranty as required to comply with the specified requirements.
1.9.1 Roof Membrane Manufacturer Warranty
NOTE: Designer may specify 5 or 10 year manufacturer warranty on facilities
of small roof area and of minor importance where interiors and contents are
not severely impacted by water intrusion and any time a one-ply modified bitumen
membrane system is specified. Environmentally controlled interiors with one-ply
membrane require a minimum 10 year warranty.
Furnish the roof membrane manufacturer's [5][10][20]-year no dollar limit roof system materials and installation
workmanship warranty, including flashing, insulation in compliance with [ASTM C 1289], and accessories necessary
for a watertight roof system construction. Provide warranty directly to the Government and commence warranty
effective date at time of Government's acceptance of the roof work. The warranty must state that:
a. If within the warranty period the roof system, as installed for its intended use in the
normal climatic and environmental conditions of the facility, becomes non-watertight, shows
evidence of moisture intrusion within the assembly, blisters, splits, tears, delaminates, separates
at the seams, or shows evidence of excessive weathering due to defective materials or installation
workmanship, the repair or replacement of the defective and damaged materials of the roof system
assembly and correction of defective workmanship are the responsibility of the roof membrane
manufacturer. All costs associated with the repair or replacement work are the responsibility
of the roof membrane manufacturer.
b. When the manufacturer or his approved applicator fail to perform the repairs within 72 hours
of notification, emergency temporary repairs performed by others does not void the warranty.
c. Damage to the roofing system caused by sustained winds having a velocity of [160 kph 100
mph][177 kph 110 mph][209 kph 130 mph]or
less is covered by the warranty.
d. Upon completion of installation, and acceptance by the [Contracting Officer] [, Architect][,
Construction Manager] and Roofing System Engineer of Record, the manufacturer must supply the
appropriate warranty to the Owner.
e. Installer must submit a minimum two year warranty to the membrane manufacturer from the
date of acceptance, with a copy to the [Contracting Officer] [, Architect][, Construction Manager]
and Roofing System Engineer of Record.
1.9.2 Roofing System Installer Warranty
The roof system installer must warrant for a period of not less than two years that the roof system, as installed,
is free from defects in installation workmanship, to include the roof membrane, flashing, insulation, accessories,
attachments, and sheet metal installation integral to a complete watertight roof system assembly. Make warranty
directly to the Government. Correction of defective workmanship and replacement of damaged or affected materials
are the responsibility of the roof system installer. All costs associated with the repair or replacement work
are the responsibility of the installer.
1.9.3 Continuance of Warranty
Repair or replacement work, ARMA 410BUR88, ARMA 460LSR97 that becomes necessary within the warranty period must
be approved, as required, and accomplished in a manner so as to restore the integrity of the roof system assembly
and validity of the roof membrane manufacturer warranty for the remainder of the manufacturer warranty period.
1.10 CONFORMANCE AND COMPATIBILITY
The entire roofing and flashing system must be in accordance with specified and indicated requirements, including
fire and wind resistance (ANSI/SPRI ES-1) requirements. Work not specifically addressed and any deviation from
specified requirements must be in general accordance with recommendations of the NRCA Roofing and Waterproofing
Manual, membrane manufacturer published recommendations and details, and compatible with surrounding components
and construction. Submit any deviation from specified or indicated requirements to the Contracting Officer for
approval prior to installation.
PART 2 PRODUCTS
NOTE: Edit the materials specification requirements as necessary for the system(s)
specified in PART 1 - DESCRIPTION OF ROOF MEMBRANE SYSTEM.
See the Note in PART 1 - DESCRIPTION OF ROOF MEMBRANE SYSTEM for useful information
in editing the membrane materials requirements.
Include bracketed requirements only as applicable to the system being specified
(e.g., torch applied systems may not require asphalt in the installation; granule
surfaced cap sheets do not require gravel or coating surfacing).
2.1 MODIFIED BITUMEN SHEETS AND FIBERGLASS FELT MATERIALS
Furnish a combination of specified materials that comprise the modified bitumen manufacturer's standard system
of the number and type of plies specified. Materials provided must be suitable for the service and climatic
conditions of the installation. Modified bitumen sheets must be watertight and visually free of pinholes, particles
of foreign matter, non-dispersed raw material, factory splices, or other conditions that might affect serviceability.
Polymer modifier must comply with ARMA PMBRG98 and be uniformly dispersed throughout the sheet. Edges of sheet
must be straight and flat.
NOTE: Select the base sheet option required and delete other base sheet options.
Specify base sheets under insulation in the insulation specification section.
Modified bitumen base sheet must be specified for two-ply membrane systems and
incorporated in three-ply membrane systems.
Perforated venting base sheet option should only be specified for application
directly on concrete deck. Base sheets with perforations are rolled into place
and then top mopped with hot asphalt. Base sheets without perforations are
mechanically attached to nailable substrates.
[a. Venting Base Sheet: ASTM D 4897, Type II, [without][with] perforations and as approved
by the modified bitumen roof membrane manufacturer.]
[b. Fiberglass Felt Base Sheet: ASTM D 4601,ASTM D 1668 Type II, [without][with] perforations
and as approved by the modified bitumen roof membrane manufacturer.]
NOTE: When specifying a two-ply membrane system or application over a fiberglass
felt base sheet, delete any reference to Interply sheet. Use modified bitumen
base sheet and cap sheet.
Specify polyester-reinforced membrane for high traffic roofs and where enhanced
puncture resistance and overall durability are required. Where polyester reinforced
sheet is required, delete any reference to ASTM D 6163.
Do not specify fiberglass membrane layer over a polyester-reinforced membrane
layer.
Specify Type II modified bitumen materials for all two-ply membrane installations,
heavy-duty or high traffic service conditions and for all instances where fiberglass
reinforced modified bitumen cap sheets are permitted.
[c. SBS Base Sheet: [ASTM D 6162] [or] [ASTM D 6164] [or]
[ASTM D 6163], Type [I or] II, Grade S, minimum 2.0 mm (80 mils) thick.]
[d. SBS Interply Sheet: [ASTM D 6162] [or] [ASTM D 6164] [or] [ASTM D 6163], Type [I or] II,
Grade S, minimum 2.0 mm (80 mils) thick.]
NOTE: Specify Grade S cap sheet only with the approval of the Government and
when gravel surfacing or field applied coating is required in lieu of factory-applied
mineral granule surfacing.
Specify 3.7 mm (145 mils) minimum thickness for SBS cap sheet unless directed
otherwise by the Government.
[e. SBS Cap Sheet: [ASTM D 6162] [or] [ASTM D 6164] [or]
[ASTM D 6163]; Type II, Grade [G][S], minimum [3.7 mm (145 mils)] [_____] thick at selvage edge,
and as required to provide specified fire safety rating.]
NOTE: APP membrane materials are allowed on Army projects only. Delete APP
on all other projects and in any case where torch application is not permitted.
[f. APP Base Sheet: ASTM D 6222, Type I or II; or ASTM D 6223; Grade [G][S], minimum 3.5 mm
(140 mils) thick at the selvage edge.]
NOTE: Specify Grade S cap sheet only with the approval of the Government and
when gravel surfacing or field applied coating is required in lieu of factory-applied
mineral granule surfacing.
Specify minimum 4 mm (160 mil) APP cap sheet thickness unless directed otherwise
by the Government.
[g. APP Cap Sheet: ASTM D 6222, Type II; or ASTM D 6223; Grade [G][S], minimum 4.0 mm (160
mils) thick at selvage edge.]
2.2 BASE FLASHING MEMBRANE
NOTE: Include metal clad flashing membrane option only where the foil surfacing
will not create an aesthetic issue and reflectance of no concern. Do not specify
foil surfaced materials for facilities along flight line or adjacent to telemetry
or tracking equipment.
Metal clad membrane flashing should not be considered effective grease protection
for the flashing or roof membrane in areas where the roof may be exposed to
cooking grease release. Lap areas remain susceptible to degradation from exposure
to grease and solvents.
Membrane manufacturer's standard, minimum two-ply modified bitumen membrane flashing system compatible with the
roof membrane specified and as recommended in membrane manufacturer's published literature. Flashing membranes
must meet or exceed the properties of the material standards specified for the modified bitumen [base][, interply]
and cap sheet, except that flashing membrane thickness must be as recommended by the membrane manufacturer.[
Metal clad flashing membrane must comply with ASTM D 6298].
[2.3 ASPHALT
NOTE: Include paragraph or bracketed requirement when hot-mopped membranes
are used or base sheets are hot-mopped to non-nailable substrates.
ASTM D 312, Type III or IV, in accordance with modified bitumen membrane manufacturer requirements and compatible
with the slope conditions of the installation.
][2.4 COLD-APPLIED MEMBRANE ADHESIVE
NOTE: Materials standards and application requirements vary for cold applied
membrane adhesives. Ensure product data and application instructions are included
under "Submittals" when cold-process membrane applications are specified. This
information will be referenced by the field personnel in monitoring the application
process.
Consider low VOC adhesives for cold-process applications on occupied buildings
and when otherwise necessary.
Membrane manufacturer's recommended [low volatile organic compound (VOC)] cold process adhesive for application
of the membrane plies.
][2.5 MEMBRANE SURFACING
NOTE: Coordinate surfacing requirements with the type of system specified in
paragraph entitled "Description of Roof Membrane System". Factory-applied granule
surfaced membrane must be specified except under non-typical conditions where
aggregate or coating applications may be considered. Factory-applied granules
or aggregate surfacing should be used where possible. Specify required finished
membrane surfacing. Delete other options.
Provide modified bitumen roof membrane cap sheet with factory-applied granule surfacing of [light][_____] color
[as selected from membrane manufacturer's standard colors].[ Provide modified bitumen membrane manufacturer's
recommended field-applied protective coating of [white][light gray][_____] color. [Aluminized coating must
comply with ASTM D 2824 or ASTM D 6848, Type I or III, as recommended by the modified bitumen roof membrane manufacturer].][
Light colored, opaque water-worn gravel aggregate surfacing material conforming to ASTM D 1863, or other aggregate
as recommended by the membrane manufacturer and approved by the Contracting Officer[, and applied in flood coat
of hot asphalt].]
]2.6 PRIMER
ASTM D 41, or other primer compatible with the application and as approved in writing by the modified bitumen
membrane manufacturer.
2.7 MODIFIED BITUMEN ROOF CEMENT
ASTM D 4586, Type II for vertical surfaces, Type I for horizontal surfaces, compatible with the modified bitumen
roof membrane and as recommended by the modified bitumen membrane manufacturer.
2.8 CANT AND TAPERED EDGE STRIPS
NOTE: Use wood cant in non-supported flashing and wood blocking details (i.e.,
expansion joints, area dividers, and wall/roof intersections where roof deck
is not supported by a wall).
The use of wood cants on new NASA projects is not allowed.
Provide standard cants and tapered edge strips of [perlite conforming to ASTM C 728][the same material as the
roof insulation][or when roof insulation material is not available, provide pressure preservative treated wood,
wood fiberboard, or rigid perlite board cants and edge strips as recommended by the manufacturer.] [or wood fiber
conforming to ASTM C 208] treated with bituminous impregnation, sizing, or waxing and fabricated to provide maximum
45 degree change in direction of membrane. Cant strips must be minimum [38.1 mm 1-1/2 inch thick and provide
for minimum 127 mm
5 inch face and 88.9 mm 3-1/2 inch vertical height when installed at 45 degree face angle][101.6 mm 4 inch vertical
height with 45 degree cant angle], except where clearance restricts height to lesser dimension. Taper edge strips
at a rate of 25.4 mm to 38.1 mm per 304.8 mm one to 1-1/2 inch per foot to a minimum of 3.175 mm 1/8 inch of
thickness. Provide kiln-dried preservative-treated wood cants, in compliance with requirements of UFGS Section
06 10 00 ROUGH CARPENTRY at base of wood nailers set on edge and wood curbing and where otherwise indicated.
2.9 FASTENERS AND PLATES
Provide coated, corrosion-resistant fasteners as recommended by the modified bitumen sheet manufacturer's printed
instructions and meeting the requirements of FM 4470 and FM P7825c for Class I roof deck construction and the
wind uplift resistance specified. For fastening of membrane or felts to wood materials, provide fasteners driven
through 25.4 mm 1 inch diameter metal discs, or one piece composite fasteners with heads not less than 25.4 mm
1 inch in diameter or 25.4 mm 1 inch square with rounded or 45 degree tapered corners.
2.9.1 Masonry or Concrete Walls and Vertical Surfaces
Use hardened steel nails or screws with flat heads, diamond shaped points, and mechanically deformed shanks not
less than 25.4 mm 1 inch long for securing felts, modified bitumen sheets, metal items, and accessories to masonry
or concrete walls and vertical surfaces. Use power-driven fastenersonly when approved in writing by the Contracting
Officer.
2.9.2 Metal Plates
Provide flat corrosion-resistant round stress plates as recommended by the modified bitumen sheet manufacturer's
printed instructions and meeting the requirements of FM 4470; not less than 50.8 mm 2 inch in diameter. Form
discs to prevent dishing or cupping.
[2.10 PRE-MANUFACTURED ACCESSORIES
NOTE: Edit, delete, and insert accessory materials requirements as required
for the specific project and components to be installed.
Pre-manufactured accessories must be manufacturer's standard for intended purpose,[ comply with applicable specification
section,] compatible with the membrane roof system and approved for use by the modified bitumen membrane manufacturer.
[2.10.1 Vapor Pressure Relief Vents
NOTE: Venting of roof insulation may be advisable when vapor barrier material
is provided beneath insulation or in recover projects when the old roof membrane
remains intact. The vapor barrier material should be specified in Section 07220
ROOF AND DECK INSULATION. Coordinate with Section 06100 ROUGH CARPENTRY to
ensure that kerfed wood nailers are specified at edge of roof insulation and
placed around periphery. For roofs requiring venting that are more than 12.192
meters (40 feet wide), stack venting should be provided to supplement edge venting.
Underside ventilation for steel decks should consist of continuous openings
3 mm to 5 mm (1/8 to 3/16 inch) wide between adjacent deck units. Coordinate
these requirements with appropriate specification sections.
Provide vents manufactured for the purpose of releasing vapor pressure from the roofing system by heat and pressure.
Vents must be one-way type design to prevent reverse flow of moisture laden air into roofing system. Valve cap
must effectively seal out wind-blown rain, snow, and not permit water entry if submerged.
][2.10.2 Pre-fabricated Curbs
Provide [_____] gauge [G90 galvanized][AZ55 galvalume][_____] curbs with minimum 101.6 mm 4 inch flange for attachment
to roof nailers. Curbs must be minimum height of 254 mm 10 inch above the finished roof membrane surface.
][2.10.3 Elevated Metal [Walkways] [and] [Platforms]
As specified in UFGS Section[ 05 50 13 MISCELLANEOUS METAL FABRICATIONS][ 05 51 33 METAL LADDERS][ 05 52 00 METAL
RAILINGS][ 05 51 00 METAL STAIRS].
]][2.11 WALKPADS
NOTE: Use walkpads as walkways and at roof access points and where the roof
or areas of the roof are intended to bear foot traffic for maintenance or other
purposes once a month or more frequently.
Roof walkpads must be polyester reinforced, granule-surfaced modified bitumen membrane material, minimum [_____]
[5 mm] ([_____][197] mils) thick, compatible with the modified bitumen sheet roofing and as recommended by the
modified bitumen sheet roofing manufacturer. Panels must not exceed 1.219 meters 4 foot in length. Other walkpad
materials require approval of the Contracting Officer prior to installation.
][2.12 PAVER BLOCKS
NOTE: Use concrete pavers as walkways on aggregate surface roofs where the
roof or areas of the roof are intended to bear foot traffic for maintenance
or other purposes once a month or more frequently. Use paver blocks under heavy
bearing components, irregular base bearings and for support and attachment of
lightweight pipe, conduit, and drainage lines routed along roof surface.
Precast concrete, minimum 38.1 mm 1-1/2 inch thick, minimum 457 mm 18 inch square for walkways and minimum 152.4
mm by 304.8 mm 6 inch by 12 inch for use in supporting surface bearing components but extending not less than
50.8 mm 2 inch beyond all sides of surface bearing bases. Install walkpad material under all paver blocks.
][2.13 ROOF INSULATION BELOW MODIFIED BITUMEN MEMBRANE SYSTEM
NOTE: If the roofing system contains insulation, coordinate with the appropriate
insulation specification section. The insulation specification should include
materials and installation up to the substrate on which the roof membrane base
sheet and or membrane layers are to be installed. Coordinate base sheet attachment
(mechanically fastened or mopped) with FM or UL fire and wind uplift requirements.
Insulation must be compatible with the roof membrane, approved by the membrane manufacturer and meeting all the
requirements of [ASTM C 552][ASTM C 578][ASTM C 726] as specified in UFGS Section 07 22 00 ROOF AND DECK INSULATION.
]2.14 MEMBRANE LINER
Provide self-adhering modified bitumen underlayment conforming to ASTM D 1970, EPDM membrane liner conforming
to ASTM D 4637, or other waterproof membrane liner material as approved by the Contracting Officer.
PART 3 EXECUTION
3.1 EXAMINATION
Ensure that the following conditions exist prior to application of the roofing materials:
a. [Drains,] [curbs,] [cants,] [control joints,] [expansion joints,] [perimeter walls,] [roof
penetrating components,] [and] [equipment supports] are in place.
b. Surfaces are rigid, clean, dry, smooth, and free from cracks, holes, and sharp changes in
elevation. Joints in the substrate are sealed to prevent dripping of bitumen into building
or down exterior walls.
c. The plane of the substrate does not vary more than 6.35 mm 1/4 inchwithin an area 3.048
by 3.048 meters 10 by 10 foot when checked with a 3.048 meter 10 foot straight edge placed anywhere
on the substrate.
d. Substrate is sloped as indicated to provide positive drainage.
e. Walls and vertical surfaces are constructed to receive counter flashing, and will permit
mechanical fastening of the base flashing materials.
f. Treated wood nailers are in place on non-nailable surfaces, to permit nailing of base flashing
at minimum height of 203.2 mm 8 inch above finished roofing surface.
g. Protect all combustible materials and surfaces which may contain concealed combustible or
flammable materials. All fire extinguishing equipment has been placed as specified.
h. Verify all Fire Watch personnel assignments.
NOTE: Coordinate with Section 06100 ROUGH CARPENTRY to ensure that waterborne
preservative treatment is specified for wood which will be in contact with roofing
components.
i. Treated wood nailers are fastened in place at eaves, gable ends, openings, and intersections
with vertical surfaces for securing of membrane, edging strips, attachment flanges of sheet
metal, and roof fixtures. [Embedded nailers are flush with deck surfaces.] [Surface-applied
nailers are the same thickness as the roof insulation.]
NOTE: Wood cants should also be used where there are non-wall supported flashing
at wood blocking forming area dividers and expansion joints, and at wall and
roof intersections where roof deck is not supported on wall.
j. Cants are securely fastened in place in the angles formed by walls and other vertical surfaces.
The angle of the cant is 45 degrees and the height of the vertical leg is not less than 88.9
mm 3-1/2 inch.
NOTE: Include venting provision for wet fill substrate materials like lightweight
cellular concrete.
[k. Venting is provided in accordance with the following:
[(1) Edge Venting: Perimeter nailers are kerfed across the width of the nailers to permit escape
of gaseous pressure at roof edges.]
[(2) Underside Venting: Vent openings are provided in steel form decking for cast-in-place
concrete substrate.]
[(3) Vapor pressure relief vents: Holes equal to the outside diameter of vents are provided
through the insulation where vents are required. Space vents in accordance with membrane manufacturer's
recommendations.]]
l. Exposed nail heads in wood substrates are properly set. Warped and split [boards] [sheets]
have been replaced. There are no cracks or end joints 6.35 mm 1/4 inch in width or greater.
Knot holes are covered with sheet metal and nailed in place. [Wood] [Plywood] decks are covered
with rosin paper or unsaturated felt prior to base sheet or roof membrane application.[ Joints
in plywood substrates are taped or otherwise sealed to prevent air leakage from the underside.]
[m. Insulation boards are installed smoothly and evenly, and are not broken, cracked, or curled.
There are no gaps in insulation board joints exceeding 6.35 mm 1/4 inch in width. Insulation
is being roofed over on the same day the insulation is installed.]
[n. Cast-in-place substrates have been allowed to cure and the surface dryness requirements
specified under paragraph entitled "Field Quality Control" have been met.]
[o. Joints between precast concrete deck units are grouted, leveled, and stripped in with felt
or bituminous stripping membrane set in bituminous cement prior to applying other roofing materials
over the area.]
p. Roof deck and framing are sloped as indicated to provide positive drainage.
3.2 PREPARATION
3.2.1 Protection of Property
3.2.1.1 Protective Coverings
NOTE: Include bracketed requirement when hot-mopped membranes are used or base
sheets are hot-mopped to non-nailable substrates.
Install protective coverings at paving and building walls adjacent to hoists[, tankers][, and kettles] prior
to starting the work. Lap protective coverings not less than 15.24 cm 6 inch, secure against wind, and vent
to prevent collection of moisture on covered surfaces. Keep protective coverings in place for the duration of
the roofing work.
[3.2.1.2 Bitumen Stops
NOTE: Include paragraph when hot-mopped membranes are used or base sheets are
hot-mopped to non-nailable substrates.
Provide felt bitumen stops or other means to prevent bitumen drippage at roof edges, openings, and vertical projections
before hot mopped application of the roofing membrane.
][3.2.2 Equipment
NOTE: Select equipment references as applicable to the project. Delete paragraphs
that are not applicable.
[3.2.2.1 Mechanical Application Devices
Mount mechanical application devices on pneumatic-tired wheels. Use devices designed and maintained to operate
without damaging the insulation, roofing membrane, or structural components.
][3.2.2.2 Flame-Heated Equipment
Do not place flame-heated equipment on roof. Provide and maintain a fire extinguisher adjacent to flame-heated
equipment and on the roof.
][3.2.2.3 Open Flame Application Equipment
NOTE: Include this requirement when torch-applied modified bitumen sheet roofing
is specified or when torch application of base flashing is permitted.
Torches and other open flame equipment must be specifically designated for use in application of modified bitumen
materials and approved by the modified bitumen sheet manufacturer. Open flame equipment must not be ignited
(burning) when left unattended. Provide and maintain a fire extinguisher adjacent to open flame equipment on
the roof. Specific requirements for fire watches and burn permits exist. These requirements will be reviewed
at the preroofing conference.
]3.2.2.3 Electric-Heated Equipment
Provide adequate electrical service as required by manufacturer of electrical equipment to ensure against damage
to equipment and property and to ensure proper application of roofing materials.
][3.2.3 Heating of Asphalt
NOTE: Include paragraph when hot-mopped membranes are used or base sheets are
hot-mopped to non-nailable substrates.
Break up solid asphalt on a surface free of dirt and debris. Heat asphalt in kettle designed to prevent contact
of flame with surfaces in contact with the asphalt. Kettles must have visible working thermometer and thermostatic
controls set to the temperature limits specified herein. Keep controls in working order and calibrated. Use
immersion thermometer, accurate within a tolerance of plus or minus one degree C 1.8 degrees F, to check temperatures
of the asphalt frequently. When temperatures exceed maximums specified, remove asphalt from the site. Do no
permit cutting back, adulterating, or fluxing of asphalt.
[3.2.3.1 Temperature Limitations for Asphalt
NOTE: Include paragraph when hot-mopped membranes are used or base sheets are
hot-mopped to non-nailable substrates.
Heat and apply asphalt at the temperatures specified below unless specified otherwise by manufacturer's printed
application instructions. Use thermometer to check temperature during heating and application. Have kettle
attended constantly during heating process to ensure specified temperatures are maintained. Do not heat asphalt
above its finished blowing temperature (FBT). Do not heat asphalt between 260 and 274 degrees C 500 and 525
degrees F for longer than four consecutive hours. Do not heat asphalt to the flash point (FP). Apply asphalt
and embed membrane sheets when temperature of asphalt is within plus or minus 14 degrees C 25 degrees F of the
equiviscous temperature (EVT) but not less than 204 degrees C 400 degrees F. Before heating and application
of asphalt refer to the asphalt manufacturer's label or bill of lading for FP, FBT, and EVT of the asphalt used.
]]3.2.4 Priming of Surfaces
Prime all surfaces to be in contact with adhered membrane materials. Apply primer at the rate of 3 liters per
10 sq. meters 0.75 gallon per 100 sq. ft. or as recommended by modified bitumen sheet manufacturer's printed
instructions to promote adhesion of membrane materials. Allow primer to dry prior to application of membrane
materials to primed surface. Avoid flammable primer material conditions in torch applied membrane applications.
3.2.4.1 Priming of Concrete and Masonry Surfaces
NOTE: Include this paragraph when roofing and flashing are applied directly
to concrete or masonry surfaces.
After surface dryness requirements have been met, coat concrete and masonry surfaces which are to receive membrane
materials uniformly with primer.
3.2.4.2 Priming of Metal Surfaces
Prime flanges of metal components to be embedded into the roof system prior to setting in bituminous materials
or stripping into roofing system.
3.2.5 Membrane Preparation
Unroll modified bitumen membrane materials and allow to relax a minimum of 30 minutes prior to installation.
In cold weather, adhere to membrane manufacturer's additional recommendations for pre-installation membrane handling
and preparation. Inspect for damage, pinholes, particles of foreign matter, non-dispersed raw material, factory
splices, or other conditions that might affect serviceability. Edges of seams must be straight and flat so that
they may be seamed to one another without forming fish mouths or wrinkles. Discard damaged or defective materials.
3.2.6 Substrate Preparation
Apply membrane to clean, dry surfaces only. Don not apply membrane to surfaces that have been wet by rain or
frozen precipitation within the previous 12 hours. Provide cleaning and artificial drying with heated blowers
or torches as necessary to ensure clean, dry surface prior to membrane application.
3.3 APPLICATION
Apply roofing materials as specified herein unless approved otherwise by the Contracting Officer. Keep roofing
materials dry before and during application. Complete application of roofing in a continuous operation. Begin
and apply only as much roofing in one day as can be completed that same day. Maintain specified temperatures
for asphalt. [Provide temporary roofing and flashing as specified herein prior to application of permanent roofing
system.]
3.3.1 Phased Membrane Construction
Phased application of membrane plies is prohibited unless otherwise approved by the Contracting Officer and supported
by the membrane manufacturer's written application instructions. If cap sheet installation is delayed, thoroughly
clean the applied membrane material surface and dry immediately prior to cap sheet installation. Priming of
the applied membrane surface may be required at the discretion of the Contracting Officer prior to cap sheet
installation.
3.3.2 Temporary Roofing and Flashing
NOTE: Include requirements for temporary roofing and flashing when construction
will require considerable work on roof, such as, installing cooling towers,
antennas, pipes, ducts, solar collectors, or other equipment, and temporary
roofing is considered necessary to ensure that permanent roofing is not damaged
during construction.
Provide watertight temporary roofing and flashing where considerable work by other trades, such as installing
[cooling towers,] [antennas,] [pipes,] [ducts,] [_____,] is to be performed on the roof or where construction
scheduling or weather conditions require protection of the building's interior before permanent roofing system
can be installed. Do not install temporary roofing over permanently installed insulation. Provide rigid pads
for traffic over temporary roofing.
[3.3.2.1 Removal
Completely remove temporary roofing and flashing before continuing with application of the permanent roofing
system.
]3.3.3 Application Method
NOTE: Specify the applicable application method(s) and distinguish any varying
requirements or options related to membrane and base flashing (e.g., in general
manufacturer may allow base flashing membrane to be torched or set in cold adhesive
on hot mopped roof membrane installations; however, this may or may not be desirable
for a specific project installation.).
[3.3.3.1 Hot Asphalt Application of Modified Bitumen Membrane
NOTE: Include paragraph when hot-mopped membranes are used or base sheets are
hot-mopped to non-nailable substrates.
Apply membrane immediately following application of hot asphalt. Apply hot asphalt within 1.829 m 6 foot of
roll. Do not work ahead with asphalt. Asphalt must be completely fluid, with mop temperatures within the asphalt's
EVT range, but not less than 204.4 degrees C 400 degrees F, at the instant membrane comes into contact with asphalt.
Application of bitumen between layers must be such as to provide full, continuous, uniform coverage and complete
contact of hot asphalt with the sheet above and below. Embed sheets in asphalt. As sheets are being rolled
into hot asphalt, immediately and thoroughly apply uniform positive pressure by squeegee, roll, or broom to ensure
full adhesion and lap seal, eliminate trapped air and to provide tight, smooth laminations. Avoid excessive
extrusion of asphalt at lap areas. Control asphalt bleed out to approximately 25.4 mm 1 inch maximum.
]3.3.3.2 Torch Applied [Heat Welded] Modified Bitumen Membrane [Flashing]
NOTE: Include the first bracketed sentence if base flashing may be torch-applied
on hot mopped membrane work. Include requirement to roll lap areas with weighted
roller when heat welding technique is specified.
Where heat welding is specified, coordinate with language in "Description of
Roof Membrane System" and other parts of this specification.
[Base flashing membrane may be torch applied.] Ensure substrate membrane surfaces are warmed either naturally
or by torch during the installation. Apply heat evenly to underside of roll membrane being installed and exposed
side lap area of previously installed sheet. Provide for slight, uniform flow of bitumen in front of roll and
full width of roll as the material is being rolled or set into place. Apply uniform positive pressure to ensure
membrane is fully adhered and all laps are sealed. Prior to forming lap over granulated surfaces, embed granules
of the receiving sheet by heating and troweling-in the granules to form a uniform black compound surface. [Roll
all lap areas with a weighted roller immediately after forming lap. Provide for visual bleed out of compound
in lap areas.][ Avoid overheating the membrane or burning through to membrane reinforcement. Inspect and ensure
all lap areas are fully sealed.]
[3.3.3.3 Cold Adhesive Applied Modified Bitumen Membrane
Apply cold adhesive with airless sprayer or 6.35 mm 1/4 inch saw-toothed rubber squeegee to prepared surfaces
in accordance with membrane manufacturer's application instructions. Fully cover substrate with adhesive. Roll
or lay membrane in adhesive in accordance with manufacturer's recommendations and within the time limitations
of adhesive application. Broom the membrane to ensure full contact with adhesive. Seal laps with adhesive or
by heat fusing with torch or hot air welder as required by membrane manufacturer. Minimize traffic on installed
membrane during the adhesive cure and set time.
][3.3.4 Ventilating Base Sheets
NOTE: Include this paragraph when ventilating base sheets are specified in
the paragraph entitled "Description of Roof Membrane System" and in the absence
of rigid board roof insulation. Include mechanical attachment or top mop requirements
as applicable. Where rigid board roof insulation is a component of the roof
system, ventilating base sheets should be specified in the roof insulation section
07220.
Apply ventilating base sheets with 76.2 mm 3 inch side laps and 152.4 mm 6 inch end laps in accordance with manufacturer's
printed application instructions for substrate [and wind uplift conditions ]specified. [Mechanical attachments
must be as required for wind resistance specified and to include increased frequency of attachment at corner
and perimeter areas. Drive fasteners flush with no dishing or cupping of fastener plate.] [Top mop perforated
sheet with a full, continuous mopping of hot asphalt.]
]3.3.5 [Fiberglass Felt][Modified Bitumen] Base Sheet
NOTE: Select the applicable application method. Delete other options. Delete
requirements for adhered base sheets where the sheet is to be mechanically fastened
through to nailable deck. Apply base sheets at right angles to roof slope,
except on insulated roofs where nailers (insulation stops) have been applied
at right angles to slope and on decks sloped one inch per foot or more, apply
felts parallel to roof slope. Include requirements for applying felts to barrel-type
roofs only when applicable.
[Fully adhere [spot adhere] base sheets in accordance with membrane manufacturer's printed instructions.] [Spot
adhesion must be with hot asphalt applied in 304.8 mm 12 inch diameter spots installed in two staggered rows,
centered 304.8 mm 12 inch in from edge of the base sheet.][Apply cold adhesive with airless sprayer or a 6.35
mm 1/4 inch saw-toothed rubber squeegee and at application rate recommended by the membrane manufacturer. Fully
cover substrate with cold adhesive. Ensure laps areas of base sheet are fully sealed.] Roll and broom in the
base sheet to ensure full contract with the [hot asphalt][adhesive] application. [On nailable substrates, mechanically
fasten base sheet in conformance with specified wind resistance requirements and membrane manufacturer's printed
instructions, and to include increased fastening frequency in corner and perimeter areas. Drive fasteners flush
with no dishing or cupping of fastener plate. Where applicable, mechanically fasten base sheet in conjunction
with insulation to the substrate, in accordance with membrane manufacturers printed instructions.] Apply sheets
in a continuous operation. Apply sheets with side laps at a minimum of 50.8 mm 2 inch unless greater side lap
is recommended by the manufacturer's standard written application instructions. Provide end laps of not less
than 152.4 mm 6 inch and staggered a minimum of 914.4 mm 36 inch. Apply sheets [at right angles to the roof
slope so that the direction of water flow is over and not against the laps] [parallel to the roof slope] [so
that plies of sheets extend from eave line on one side of the barrel-type roof and 457.2 mm 18 inch over the
center line of the crown of the roof. Apply sheets on the other side in the same manner, resulting in twice
the normal amount of roofing sheets and asphalt at the crown]. Extend base sheets approximately 50.8 mm 2 inch
above the top of cant strips at vertical surfaces and to the top of cant strips elsewhere. Trim base sheet
to a neat fit around vent pipes, roof drains, and other projections through the roof. Application must be free
of ridges, wrinkles, and buckles.
3.3.6 Modified Bitumen Membrane Application
NOTE: On slopes up to 1:6 (2 inches per foot), specify membrane application
perpendicular to slope of roof. On slopes greater than or equal to 1:6 (2 inches
per foot), specify membrane application parallel to roof slope.
Ensure proper sheet alignment prior to installation. [Apply membrane layers perpendicular to slope of roof in
shingle fashion to shed water, including application on areas of tapered insulation that change slope direction.][Apply
membrane layers parallel to slope of roof.] Bucking or backwater laps are prohibited. Fully adhere membrane
sheets to underlying substrate materials. Provide minimum 76.2 mm 3 inch side laps and minimum 152.4 mm 6 inch
end laps and as otherwise required by membrane manufacturer. Stagger end laps minimum 914.4 mm 36 inch. Offset
side laps between membrane layers a minimum of 304.8 mm 12 inch. Offset end laps between membrane layers a minimum
of 914.4 mm 36 inch. Install all membrane layers the same workday, unless supported otherwise by roof membrane
manufacturer application instructions and approved by the Contracting Officer. Provide tight smooth laminations
of each membrane layer without wrinkles, ridges, buckles, kinks, fishmouths, or voids. Ensure full membrane
adhesion and full lap seals. Rework to seal any open laps prior to application of subsequent membrane layers.
The completed membrane application must be free of surface abrasions, air pockets, blisters, ridges, wrinkles,
buckles, kinks, fishmouths, voids, or open seams.
3.3.6.1 Cap Sheet Installation
NOTE: Include the option of hot asphalt or torch application of cap sheet where
permissible. Torch applied cap sheet can be applied over hot mopped membrane
plies. Torch application of cap sheet may reduce instances of cap sheet blistering.
Where finished appearance of the roof is of consequence, include the bracketed
requirement for granule application in areas of bitumen bleed out.
Underlying applied membrane must be inspected and repaired free of damage, holes, puncture, gouges, abrasions,
and any other defects, and free of moisture, loose materials, debris, sediments, dust, and any other conditions
required by the membrane manufacturer prior to cap sheet installation. Do not apply cap sheet if rain or frozen
precipitation has occurred within the previous 24 hours. Align cap membrane and apply by the specified method
with the proper side and end lap widths. [Set cap sheet in hot asphalt or torch apply as recommended by the
modified bitumen membrane manufacturer.] Cut at a 45 degree angle across selvage edge of cap membrane to be
overlapped in end lap areas prior to applying overlapping cap membrane. [Apply matching granules in any areas
of [bitumen][adhesive] bleed out while the [asphalt is still hot][adhesive is still tacky].] Minimize traffic
on newly installed cap sheet membrane.
[3.3.6.2 Backnailing of Cap Sheet
NOTE: Include this paragraph for roof slopes greater than or equal to 1:6 (2
inches per foot). Coordinate with insulation Section 07220 ROOF AND DECK INSULATION
and nailer requirements Section 06100 ROUGH CARPENTRY to allow for backnailing
of the membrane.
Unless otherwise recommended by the modified bitumen membrane manufacturer and approved by the Contracting Officer,
provide minimum 88.9 mm 3-1/2 inch wide nailing strips matching insulation thickness and applied perpendicular
to roof slope for backnailing of roof membrane. Space nailing strips as recommended by the membrane manufacturer,
but not exceeding 4.88 m 16 foot on center unless approved otherwise by the Contracting Officer. Coordinate
the nailer installation with insulation requirements. Install the modified bitumen cap sheet to provide for
end laps at nailer locations. Nail the modified bitumen cap sheet at the end lap area across the width of the
sheet. Nail within 25.4 mm 1 inch of each edge of the sheet and at 203.2 mm to 215.9 mm 8 inch to 8-1/2 inch
on center across the width of the sheet in a staggered fashion. Nails must have 25.4 mm 1 inch diameter metal
cap or be nailed through 25.4 mm 1 inch diameter caps. Cover nails by overlapping adjacent upslope sheet at
the end lap area.
]3.3.7 Membrane Flashing
Apply two-ply modified bitumen strip flashing and sheet flashing in the angles formed where the roof deck abuts
walls, curbs, ventilators, pipes, and other vertical surfaces, and where necessary to make the work watertight.
Apply membrane flashing in accordance with the roof membrane manufacturers printed instructions and as specified.
Cut at a 45 degree angle across terminating end lap area of cap membrane prior to applying adjacent overlapping
cap membrane. Press flashing into place to ensure full adhesion and avoid bridging. Ensure full lap seal in
all lap areas. Mechanically fasten top edge of modified bituminous base flashing 150 mm (6 inches) on center
through minimum 25.4 mm 1 inch diameter tin caps with fasteners of sufficient length to embed minimum one inch
into attachment substrate.[ Apply matching granules in any areas of [asphalt][adhesive] bleed out while the [asphalt
is still hot][adhesive is still tacky].] Apply membrane liner over top of exposed nailers and blocking and to
overlap top edge of base flashing installation at curbs, parapet walls, expansion joints and as otherwise indicated
to serve as waterproof lining under sheet metal flashing components. Metal flashing per SMACNA 1793 guidelines
and standards is specified under UFGS Section 07 60 00 FLASHING AND SHEET METAL. Do not set metal flashing in
hot asphalt.
3.3.7.1 Membrane Strip Flashing
Set primed flanges of metal flashing in full bed of modified bituminous cement material and securely fasten through
to attachment substrate. Strip-in with membrane flashing so that strip extends not less than 101.6 mm4 inch
beyond outer edge of flange. Where multiple membrane stripping plies are installed, extend each additional stripping
ply minimum 101.6 mm 4 inch beyond edge of previous ply.
[3.3.7.2 Membrane Flashing at Roof Drain
NOTE: Include this paragraph when roof drains are indicated.
Roof drains are specified in UFGS Section 22 00 00 PLUMBING, GENERAL PURPOSE. Flashing for roof drains, is specified
in UFGS Section 07 60 00 FLASHING AND SHEET METAL. Extend membrane sheets to edge of drain bowl opening at the
roof drain deck flange in accordance with membrane manufacturer's printed application instructions. Securely
clamp membrane sheets and metal roof drain flashing and strip flashing in the flashing clamping ring. Secure
clamps so that sheets and metal flashing are free from wrinkles and folds. Trim stripping must be flush with
inside of clamping ring.
][3.3.7.3 Pre-fabricated Curbs
Securely anchor prefabricated curbs to nailer or other base substrate and flash with modified bitumen membrane.
]3.3.7.4 Set-On Accessories
Where pipe or conduit blocking, supports and similar roof accessories are set on the membrane, adhere walkpad
material to bottom of accessories prior to setting on roofing membrane. Specific method of installing set-on
accessories must permit normal movement due to expansion, contraction, vibration, and similar occurrences without
damaging roofing membrane. Do not mechanically secure set-on accessories through roofing membrane into roof
deck substrate.
3.3.7.5 Lightning Protection
Flash and attach lightning protection system components to the roof membrane in a manner acceptable to the roof
membrane manufacturer.
3.3.8 Roof Walkpads
Install walkpads at roof access points and where otherwise indicated for traffic areas and for access to mechanical
equipment, in accordance with the modified bitumen sheet roofing manufacturer's printed instructions. Provide
minimum 152.4 mm 6 inch separation between adjacent walkpads to accommodate drainage. Provide walkpad [or an
additional layer of cap sheet] under precast concrete paver blocks to protect the roofing.
[3.3.9 Elevated Metal [Walkways] [and] [Platforms]
Install over completed roof system in accordance with UFGS[ Section 05 50 13 MISCELLANEOUS METAL FABRICATIONS][
Section 05 51 33 METAL LADDERS][ Section 05 52 00 METAL RAILINGS][ Section 05 51 00 METAL STAIRS]. Provide protection
mat of walkpad material, or other material approved by the Contracting Officer, at all surface bearing support
locations.
]3.3.10 Paver Blocks
Install paver blocks where indicated and as necessary to support surface bearing items traversing the roof area.
Set paver block on a layer of walkpad [or cap sheet] applied over the completed roof membrane.
[3.3.11 Vapor Pressure Relief Vents
NOTE: Include this paragraph only where vapor pressure relief venting over
wet fill substrate material or insulation over vapor barrier material is required.
Coordinate with venting provisions in other paragraphs of this specification.
Provide vents in a uniform pattern and at a minimum rate of one for each 92.9 square meters 1000 square feet
of roof area. Space and install in strict accordance with manufacturer's instructions. Cut a hole, of diameter
to suit base opening size of vent, through the roofing membrane and down to the deck [vapor barrier material]
surface. Fill the cut out with loose fill fiberglass or crumbled polyisocyanurate insulation. Set vent flange
over hole on top of roofing membrane in a 3.175 mm 1/8 inch thick bed of modified bitumen roof cement or special
adhesive or cement recommended by vent manufacturer. Strip-in vent flanges with strip flashing membrane and
provide bead of modified bitumen sealant at membrane termination at base of vent.
][3.3.12 Field Applied Surfacing
NOTE: Delete "Field Applied Surfacing" and associated paragraphs if factory-applied
granule surfaced membrane is specified. Otherwise, include only the applicable
surfacing, delete all others.
After completion of roof membrane and flashing installation, and correction of tears, gouges, and other deficiencies
in the installed work, apply specified surfacing.
[3.3.12.1 Aggregate
Uniformly flood coat the surface with hot asphalt at a rate of approximate 27.2 kg 60 pounds per square. While
asphalt is still hot, apply gravel aggregate surfacing material at a rate of 181.4 kg 400 pounds per square or
136.1 kg 300 pounds per square for slag or other approved aggregate surfacing. Provide for full and uniform
coverage of the roof surface. Solidly adhere approximately 50 percent of the aggregate in the asphalt.
][3.3.12.2 Coating Application
Apply surface coating materials to membrane and flashing in accordance with coating material manufacturer's recommendations.
]]3.3.13 Correction of Deficiencies
Where any form of deficiency is found, additional measures will be taken as deemed necessary by the Contracting
Officer to determine the extent of the deficiency and corrective actions must be performed as directed by the
Contracting Officer.
3.3.14 Clean Up
Remove debris, scraps, containers and other rubbish and trash resulting from installation of the roofing system
from job site each day.
3.4 PROTECTION OF APPLIED ROOFING
At the end of the day's work and when precipitation is imminent, protect applied modified bitumen roofing system
from water intrusion.
[3.4.1 Water Cutoffs
NOTE: Include this paragraph when roof insulation is a substrate for the modified
bitumen sheet roofing.
Straighten insulation line using loose-laid cut insulation sheets and seal the terminated edge of modified bitumen
roofing system in an effective manner. [Seal off flutes in metal decking along the cutoff edge.] Remove the
water cut-offs to expose the insulation when resuming work, and remove the insulation sheets used for fill-in.
]3.4.2 Temporary Flashing for Permanent Roofing
Provide temporary flashing at drains, curbs, walls and other penetrations and terminations of roofing sheets
until permanent flashing can be applied. Remove temporary flashing before applying permanent flashing.
3.4.3 Temporary Walkways, Runways, and Platforms
Do not permit storing, walking, wheeling, and trucking directly on applied roofing materials. Provide temporary
walkways, runways, and platforms of smooth clean boards, mats or planks as necessary to avoid damage to applied
roofing materials, and to distribute weight to conform to live load limits of roof construction. Use rubber-tired
equipment for roofing work.
3.5 FIELD QUALITY CONTROL
Perform field tests in the presence of the Contracting Officer. Notify the Contracting Officer one day before
performing tests.
[3.5.1 Test for Surface Dryness
NOTE: Include paragraph or bracketed requirement when hot-mopped membranes
are used or base sheets are hot-mopped to non-nailable substrates.
Before application of membrane sheets and starting work on the area to be roofed, perform test for surface dryness
in accordance with the following:
a. Foaming: When poured on the surface to which membrane materials are to be applied, one
pint of asphalt when heated in the range of 176 to 204 degrees C 350 to 400 degrees F, must
not foam upon contact.
b. Strippability: On cementitious substrate surfaces, after asphalt used in the foaming test
application has cooled to ambient temperatures, test coating for adherence. Should a portion
of the sample be readily stripped clean from the surface, do not consider the surface to be
dry and do not start application. Should rain occur during application, stop work and do not
resume until surface has been tested by the method above and found dry.
]3.5.2 Construction Monitoring
During progress of the roof work, Contractor must make visual inspections as necessary to ensure compliance with
specified parameters. Additionally, verify the following:
a. Materials comply with the specified requirements.
b. Materials are not installed in adverse weather conditions.
All materials are properly stored, handled and protected from moisture or other damages.
c. Equipment is in working order. Metering devices are accurate.
d. Substrates are in acceptable condition, in compliance with specification, prior to application
of subsequent materials.
(1) Nailers and blocking are provided where and as needed.
Insulation substrate is smooth, properly secured to its substrate, and without excessive gaps
prior to membrane application.
(2) The proper number, type, and spacing of fasteners are installed.
Membrane heating, hot mopping, or adhesive application is provided uniformly and as necessary
to ensure full adhesion of roll materials. Asphalt is heated and applied within the specified
temperature range.
The proper number and types of plies are installed, with the specified overlaps.
Applied membrane surface is inspected, cleaned, dry, and repaired as necessary prior to cap
sheet installation.
(3) Lap areas of all plies are completely sealed.
Membrane is fully adhered without ridges, wrinkles, kinks, fishmouths, or other voids or delaminations.
Installer adheres to specified and detailed application parameters.
Associated flashing and sheet metal are installed in a timely manner in accord with the specified
requirements.
Temporary protection measures are in place at the end of each work shift.
[3.5.2.1 Manufacturer's Inspection
NOTE: Include this paragraph when manufacturer's inspection of work is required.
Select desired frequency of manufacturer inspection and coordinate with text
of optional second and third bracketed sentences.
Manufacturer's technical representative must visit the site a minimum of three [_____] times [once per week]
during the installation for purposes of reviewing materials installation practices and adequacy of work in place.
[ Inspections must occur during the first 20 squares of membrane installation, at mid-point of the installation,
and at substantial completion, at a minimum. Additional inspections must not exceed one for each 100 squares
of total roof area with the exception that follow-up inspections of previously noted deficiencies or application
errors must be performed as requested by the Contracting Officer.] After each inspection, submit a report, signed
by the manufacturer's technical representative to the Contracting Officer within 3 working days. Note in the
report overall quality of work, deficiencies and any other concerns, and recommended corrective action.
]3.5.3 Samples of Roofing
NOTE: This requirement is included for optional enforcement at the discretion
of the Contracting Officer. It is not the intent to require cut samples on
all roof projects.
Take samples per ASTM D 5147, sized 101.6 mm by 1016 mm 4-inch by 40-inch cut across width of modified bitumen
sheets as directed by the Contracting Officer. Cut samples will be examined by the Contracting Officer for specified
number of plies, proper lap width, complete lap seal, full uniform adhesive compound application and adhesion,
full bond between plies, harmful foreign materials, presence of moisture, and wet insulation. Where cuts are
not retained by the Contracting Officer or disposed, set cut strip back in cut area in bed of modified bitumen
cement. Repair area of cut with new minimum two-ply modified bitumen membrane patch.
3.5.4 Roof Drain Test
NOTE: Include this paragraph when roof drains are required. Consult with structural
engineer to verify loading capability of roof structural system.
After completing roofing, but prior to Government acceptance, perform the following test for watertight integrity.
Plug roof drains and fill with water to edge of drain sump for 8 hours. Do not plug secondary overflow drains
at the same time as adjacent primary drain. To ensure some drainage from roof, do not test all drains at same
time. Measure water at beginning and end of the test period. When precipitation occurs during test period,
repeat test. When water level falls, remove water, thoroughly dry, and inspect installation; repair or replace
roofing at drain to provide for a properly installed watertight flashing seal. Repeat test until there is no
water leakage.
[3.6 INFRARED INSPECTION
NOTE: This optional requirement should be included only under special circumstances
and on roof systems conducive to effective infrared scanning, or as otherwise
instructed.
[Eight][_____] months after completion of the roofing system, the Contractor must inspect the roof surface using
infrared (IR) scanning as specified in ASTM C 1153. Where the IR inspection indicates moisture intrusion, wet
insulation and damaged or deficient materials or construction must be replaced in a manner to provide watertight
construction and maintain the specified roof system warranties.
]3.7 INSTRUCTIONS TO [GOVERNMENT][CONTRACTOR] PERSONNEL
Furnish written and verbal instructions on proper maintenance procedures to designated Government personnel.
Furnish instructions by a competent representative of the modified bitumen membrane manufacturer and include
a minimum of 4 hours on maintenance and emergency repair of the membrane. Include a demonstration of membrane
repair, and give sources of required special tools. Furnish information on safety requirements during maintenance
and emergency repair operations.
3.8 INFORMATION CARD
For each roof, furnish a typewritten information card for facility Records and a card laminated in plastic and
framed for interior display at roof access point, or a photoengraved 1 mm 0.039 inch thick aluminum card for
exterior display. Card must be 215 mm by 275 mm 8 1/2 by 11 inch minimum. Information card must identify facility
name and number; location; contract number; approximate roof area; detailed roof system description, including
deck type, membrane, number of plies, method of application, manufacturer, insulation and cover board system
and thickness; presence of tapered insulation for primary drainage, presence of vapor barrier material; date
of completion; installing contractor identification and contact information; membrane manufacturer warranty expiration,
warranty reference number, and contact information. The card must be a minimum size of 215 mm by 275 mm 8 1/2
by 11 inch. Install card at roof top or access location as directed by the Contracting Officer and provide a
paper copy to the Contracting Officer.