USACE / NAVFAC / AFCESA / NASA UFGS-07 53 23 (November 2008)
--------------------------------
Preparing Activity: NAVFAC Superseding
UFGS-07 53 23 (January 2007)
UFGS-07 53 00.00 40 (April 2006)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 07 53 23
ETHYLENE-PROPYLENE-DIENE-MONOMER ROOFING
11/08
NOTE: This guide specification covers the requirements for ethylene propylene
diene terpolymer (EPDM) elastomeric sheet roofing, with associated elastomeric
sheet flashing, for installations with the insulation below the membrane.
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: Standard application methods include loose-laid ballasted, fully adhered,
and mechanically fastened systems. Also included is a special combined fully
adhered and mechanically fastened system for excessive wind loading conditions.
This guide specification does not include the structural roof deck, insulation,
sheet metal fascias, gravel stops, flashings, nor use of elastomeric sheets
for roofing located adjacent to kitchen or food service exhaust system discharge
ducts. Grease and oil attack EPDM. Exhaust fumes must be directed away from
the roofing system.
Coordinate this section with other roof system components specifications such
as rough carpentry, insulation and sheet metal flashing. 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.
Specified membrane attachment must be compatible with the insulation specified.
Do not adhere membrane directly to polystyrene, perlite or standard wood fiber,
insulation. Facer on polyisocyanurate insulations must be compatible with the
adhesive of a fully adhered membrane application. Glass mat, moisture resistant
gypsum roof board can be used as an underlayment over insulation for adhesive
application of roof membrane with approval of the membrane manufacturer. Top
insulation layer under ballasted roofing systems must be wood fiberboard, perlite,
or glass mat, moisture resistant gypsum roof board.
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 RD-1(2004) Standard for Retrofit Roof Drains][AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)ASCE 7(2005; Supp 1) Minimum Design Loads for Buildings and Other Structures][ASTM INTERNATIONAL (ASTM)ASTM D 448(2008) Sizes of Aggregate for Road and Bridge ConstructionASTM D 4637(2008) EPDM Sheet Used in Single-Ply Roof MembraneASTM D 4811(2006) Nonvulcanized (Uncured) Rubber Sheet Used as Roof FlashingASTM D 6369(1999; R 2006) Design of Standard Flashing Details for EPDM Roof MembranesASTM 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][NATIONAL ROOFING CONTRACTORS ASSOCIATION (NRCA)NRCA 0405(2001; R 2003, 5th Ed) Roofing and Waterproofing Manual][SINGLE PLY ROOFING INDUSTRY (SPRI)SPRI RP-4(2002) Wind Design Standard for Ballasted Single-Ply Roofing Systems][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.
Select the application method required. Delete other options.
Where EPDM systems are utilized, fully adhered systems applied over minimum
two layers of rigid board roof insulation is the preferred norm.
Do not specify stone ballasted systems along flight lines, in wind zones exceeding
160 km/h 100 mph, within 8 km 5 miles of coastline, within 457 m 1500 feet of
open body of water, and on or adjacent to critical facilities such as hospitals.
Where ballasted systems are required, utilize interlocking pavers designed to
resist the required wind loads. Ballasted systems on air permeable decks (e.g.,
metal decks, precast concrete panels or planks) must incorporate an air barrier
in the assembly.
Mechanically fastened systems must also incorporate an air barrier in the roof
assembly. Use reinforced membrane in wind zones exceeding 160 km/h 100 mph,
within 8 km 5 miles of coastline or within 457 m 1500 feet of open body of water.
Specify combination attachment only for isolated geographic locations that
experience extreme and extended wind conditions such as portions of Alaska and
Iceland, or as otherwise required by the Government.
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) or area
of the building or project where each system is to be applied.
[Fully adhered][Mechanically fastened][Ballasted][Combination fully adhered and mechanically fastened] EPDM roof
membrane system applied over [insulation][recovery board][concrete roof deck] substrate.
[_______]: [Fully adhered][Mechanically fastened][Ballasted][Combination fully adhered and mechanically fastened]
EPDM roof membrane system applied over [insulation][recovery board][concrete roof deck] substrate.
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 Drawing
Wind Load Calculations
Boundaries of Enhanced Perimeter
Corner Attachments of Roof System Components
Location of Perimeter Half-Sheets
Spacing of Perimeter, Corner, and Infield Fasteners
Slopes and Drain Locations
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.
Cement
EPDM Sheet[; G][; G, [_____]]
Seam Tape
Bonding Adhesive
Lap Splice Adhesive
Water Cutoff Mastic/Water Block
Lap Cleaner, Lap Sealant, and Edge Treatment
Flashings
Flashing Accessories
Flashing Tape
Fasteners and Plates
[Ballast]
Roof Insulation
[Protection Mat]
[Pre-Manufactured Accessories]
Sample warranty certificate[; G][; G, [_____]]
Submit all data required together with requirements of this section. Include a written acceptance
by the roof membrane manufacturer of the insulation and other products and accessories to be
provided. List products in the applicable wind uplift and fire rating classification listings,
unless approved otherwise by the Contracting Officer.
SD-05 Design Data
NOTE: Incorporate this paragraph for ballasted systems and anytime non-FM rated
systems are permissible. Coordinate with requirements of "Wind Uplift" paragraph.
Wind Uplift Calculations[; G][; G, [_____]]
[Engineering calculations validating the wind resistance of roof system.]
SD-07 Certificates
Qualification of Manufacturer
Certify that the manufacturer of the roof 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."
Wind Uplift Resistance classification, as applicable[; G][; G, [_____]]
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.
Application[; G][; G, [_____]]
Application Method[; G][; G, [_____]], including pattern and frequency of mechanical attachments
required in the field of roof, corners, and perimeters to provide for the specified wind resistance
Membrane Flashing[; G][; G, [_____]]
Seam Tape
Tape Seams / Lap Splices
Adhesive Seams / Lap Splices
Perimeter Attachment
Primer
Fasteners
[Pavers]
[Protection Mat]
[Pre-Manufactured Accessories]
Cold Weather Installation[; G][; G, [_____]]
Include detailed application instructions and standard manufacturer drawings altered as required
by these specifications. Explicitly identify in writing, differences between manufacturer's
printed instructions and the specified requirements.
SD-11 Closeout Submittals
Warranty
Information Card
Instructions To Government Personnel
Include copies of Material Safety Data Sheets for maintenance/repair materials.
1.3.1 Shop Drawings
Roof plan drawing depicting wind load calculations and boundaries of enhanced perimeter and corner attachments
of roof system components, [location of perimeter half-sheets][, spacing of perimeter, corner, and infield fasteners
,] as applicable. The drawing must reflect the project roof plan of each roof level and conditions indicated.
Provide all slopes and drain locations.
1.4 QUALITY ASSURANCE
1.4.1 Qualification of Manufacturer
NOTE: Specify 5 years manufacturer experience unless directed otherwise by
the Government
EPDM sheet roofing membrane manufacturer must have at least [5][_____] years experience in manufacturing EPDM
roofing products.
1.4.2 Qualification of Applicator
NOTE: Specify 3 years as an approved Contractor unless directed otherwise by
the Government
Roofing system applicator must be approved, authorized, or licensed in writing by the roof membrane manufacturer
and must have a minimum of [three][_____] 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 5 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 Fire Resistance
Complete roof covering assembly must:
a. Be Class A 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 the UL RMSD or Class I roof
deck construction in the FM P7825.
FM or UL approved components of the roof covering assembly must bear the appropriate FM or UL label.
1.4.4 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 approval rating incorporates a safety factor of 2 over the
maximum calculated uplift pressure in inch-pound units. Therefore, a FM approval
rating of 1-90 correlates to a maximum uplift calculation of 2.2 kPa 45 psf.
When specifying an FM rated system, ensure the designed roof system is capable
of providing the specified FM approval rating. Where non-rated systems may
be permissible, include the bracketed portion of the second sentence and the
third sentence.
Ballast for loose-laid ballasted application should be designed in accordance
with ANSI/RMA/SPRI RP-4. Where ballasted systems are specified include the
bracketed option at the end of the paragraph.
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 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. Do not install non-rated systems[, except as approved by the
Contracting Officer]. Provide wind load calculations and submit engineering calculations and substantiating
data to validate wind resistance of any non-rated roof system. Apply wind uplift calculations based on a design
wind speed of [_____] km/h [_____] mph in accordance with ASCE 7[ or applicable building code requirements].
[Resistance to wind uplift for loose-laid ballasted application must be in accordance with requirements of SPRI RP-4
.]
1.4.5 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, specifications and submittals related to the roof work;
b. Roof system components installation;
c. Procedure for the roof manufacturer's technical representative's onsite inspection and acceptance
of the 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 representative;
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; and
e. Quality control 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, 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, 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
Deliver materials in their original, unopened containers or wrappings with labels intact and legible. Where
materials are covered by a referenced specification number, the labels must bear the specification number, type,
class, and shelf life expiration date where applicable. Deliver materials in sufficient quantity to allow continuity
of work.
1.5.2 Storage
Store and protect materials from damage and weather in accordance with manufacturer's printed instructions, except
as specified otherwise. Keep materials clean and dry. Store and maintain adhesives, sealants, primers and other
liquid materials above 15 degrees C 60 degrees F. Insulated hot boxes or other enclosed warming devices must
be required in cold weather. Mark and remove damaged materials from the site. Use pallets to support and canvas
tarpaulins to completely cover material materials stored outdoors. Do not use polyethylene as a covering. Locate
materials temporarily stored on the roof in approved areas, and distribute the load to stay within the live load
limits of the roof construction. Remove unused materials from the roof at the end of each days work.
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 so as not to damage materials or applied roofing. Do not use materials contaminated
by exposure or moisture. Remove contaminated materials from the site. When hazardous materials are involved,
adhere to the special precautions of the manufacturer. Adhesives may contain petroleum distillates and may be
extremely flammable; prevent personnel from breathing vapors, and do not use near sparks or open flame.
1.6 ENVIRONMENTAL REQUIREMENTS
Do not install EPDM sheet roofing during high winds or inclement weather, or when there is ice, frost, moisture,
or visible dampness on the substrate surface, or when condensation develops on surfaces during application.
Unless recommended otherwise by the EPDM sheet manufacturer and approved by the Contracting Officer, do not install
EPDM sheet when air temperature is below 4 degrees C 40 degrees F or within 3 degrees C 5 degrees F of the dewpoint.
Follow manufacturer's printed instructions for installation during cold weather conditions.
1.7 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 counterflashing 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.]
1.8 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.
1.8.1 Roof Membrane Manufacturer Warranty
NOTE: Insulated and routinely occupied facilities or facilities containing
sensitive equipment or operations require a warranty of not less than 15 years.
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 potential water intrusion. Environmentally controlled interiors
require minimum 10 year warranty regardless of small size.
Furnish the roof membrane manufacturer's [5][10][15][_____] year no dollar limit roof system materials and installation
workmanship warranty, including flashing, insulation, and accessories necessary for a watertight roof system
construction. The warranty must run directly to the Government and commence 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, splits, tears, cracks, delaminates, separates
at the seams, shrinks to the point of bridging or tenting membrane at transitions, 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 must be the responsibility of the roof membrane manufacturer.
The roof membrane manufacturer is responsible for all costs associated with the repair or replacement
work.
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.
1.8.2 Roofing System Installer Warranty
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. The warranty must run directly to the Government. The
roof system installer is responsible for correction of defective workmanship and replacement of damaged or affected
materials. The installer is responsible for all costs associated with the repair or replacement work.
1.8.3 Continuance of Warranty
Approve repair or replacement work that becomes necessary within the warranty period, as required, and accomplish
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.
1.9 CONFORMANCE AND COMPATIBILITY
The entire roofing and flashing system must be in accordance with specified and indicated requirements, including
fire and wind resistance requirements. Work not specifically addressed and any deviation from specified requirements
must be in general accordance with recommendations of the NRCA 0405, membrane manufacturer published recommendations
and details, ASTM D 6369, 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
2.1 MATERIALS
Coordinate with other specification sections related to the roof work. Furnish a combination of specified materials
that comprise a roof system acceptable to the roof membrane manufacturer and meeting specified requirements.
Protect materials provided from defects and make suitable for the service and climatic conditions of the installation.
2.1.1 EPDM Sheet
NOTE: Refer to Designer Note in PART 1 - DESCRIPTION OF ROOF MEMBRANE SYSTEM
for guidance regarding membrane attachment method and in editing the membrane
materials requirements.
Specify 1.1 mm 0.045 inch Type II reinforced membrane for mechanically fastened
applications in wind zones exceeding 160 km/h 100 mph, within 8 km 5 miles of
coastline or within 457 m 1500 feet of open body of water.
Typically specify 1.5 mm 0.060 inch Type II non-reinforced membrane for fully
adhered or ballasted application, except that 1.1 mm 0.045 inch Type III membrane
with fleece-backing may be used in fully adhered installations. When Type III
membrane is required the adhesive is typically a spray applied compound, spray
foam adhesive, or hot asphalt. Modify related portions of this specification
for proper adhesive and application parameters when Type III membrane is specified.
2.3 mm 0.090 inch membrane is a special material with limited availability.
Specify 2.3 mm 0.090 inch membrane only for applications that experience regular
heavy traffic conditions or regular extreme wind conditions. 2.3 mm 0.090 inch
membrane must only be fully adhered.
Ethylene Propylene Diene Terpolymer (EPDM), ASTM D 4637, [Type I, non-reinforced][Type II, scrim or fabric reinforced][Type
III, fabric or fleece backed], 1.1 mm 0.045 inch 1.5 mm 0.060 inch 2.3 mm 0.090 inch nominal thickness for [mechanically
fastened] [fully adhered] [loose-laid ballasted] [combined fully adhered and mechanically fastened] application.
The minimum thickness must not be less than minus 10 percent of the specified thickness value. EPDM membrane
thickness specified is exclusive of backing material on the EPDM membrane. Principal polymer used in manufacture
of the membrane sheet must be greater than 95 percent EPDM. Width and length of sheet must be [as recommended
by the manufacturer.][maximum width attainable as recommended by the manufacturer to minimize field formed seams
in the field of the roof.]
2.1.2 Seam Tape
NOTE: Seam tapes have proven most effective in maintaining long term seal of
field seams of roof membrane. Seam tapes can be difficult to apply to membrane
flashing situations. As such, lap splice adhesive or self-adhering flashing
membrane are used as alternatives in difficult membrane flashing areas.
Seam tapes must be minimum 75 mm 3 inch wide. Some specific situations may
require wider seam tapes as recommended by the membrane manufacturer.
Double-sided synthetic rubber tape, minimum 0.76 mm 0.03 inch thick, minimum75 mm 3 inch wide. The roof membrane
manufacturer must supply seam tape recommended by the manufacturer's printed data for forming watertight bond
of EPDM sheet materials to each other for the application specified and conditions encountered. 150 mm 6 inch
wide tape is required for seam seals along lines of mechanical attachment of membrane.
2.1.3 Lap Splice Adhesive
NOTE: Lap splice adhesive is used for some membrane to membrane bond applications.
Include bracketed options as applicable.
Low VOC materials may be required in some geographic locations and on occupied
buildings to minimize potential irritation to occupants.
Include second and third brackets options at end of paragraph when lap splice
adhesive is prohibited for field seams of roof membrane.
[Low volatile organic compound (VOC)] synthetic rubber adhesive as supplied by roof membrane manufacturer and
recommended by the manufacturer's printed data for forming watertight bond of EPDM sheet membrane materials to
each other [in areas of membrane flashing]. [Do not use splice adhesive to form membrane seams in field of roof
or at standard base flashing conditions.]
2.1.4 Bonding Adhesive
NOTE: Bonding adhesive is used for adhering EPDM membrane to materials other
than EPDM.
Low VOC materials may be required in some geographic locations and on occupied
buildings to minimize potential irritation to occupants.
When Type III (fleece-backed) membrane is specified, include the first bracketed
option as applicable, delete the second bracketed option, and write in a description
of the adhesive required as the third bracketed option. When hot asphalt is
the specified adhesive, in Part 3, include parameters for heating of asphalt
and application similar to those found in UFGS 07511.
[Low volatile organic compound (VOC)] [synthetic rubber][_____] adhesive as supplied by roof membrane manufacturer
and recommended by the manufacturer's printed data for bonding EPDM membrane materials to insulation, wood, metal,
concrete or other substrate materials. Do not use bonding adhesive to bond membrane materials to each other.
2.1.5 Lap Cleaner, Lap Sealant, and Edge Treatment
As supplied by the roof membrane manufacturer and recommended by the manufacturer's printed data.
2.1.6 Water Cutoff Mastic/Water Block
As supplied by the roof membrane manufacturer and recommended by the manufacturer's printed data.
2.1.7 Membrane Flashings and Flashing Accessories
Membrane flashing, including self-adhering membrane flashing, perimeter flashing, flashing around roof penetrations,
and prefabricated pipe seals, must be minimum 1.1 mm 0.045 inch minimum cured EPDM, as recommended by the roof
membrane manufacturer or minimum 1.4 mm 0.055 inch thick uncured EPDM sheet in compliance with ASTM D 4811, Type
I. Use cured EPDM membrane to the maximum extent recommended by the roof membrane manufacturer. Limit uncured
flashing material to reinforcing inside and outside corners and angle changes in plane of membrane, and to flash
scuppers, pourable sealer pockets, and other formed penetrations or unusually shaped conditions as recommended
by the roof membrane manufacturer where the use of cured material is impractical.
2.1.7.1 Flashing Tape
EPDM-backed synthetic rubber tape, minimum 150 mm 6 inch wide as supplied by the roof membrane manufacturer and
recommended by the manufacturer's printed data.
2.1.8 Membrane Fasteners and Plates
Coated, corrosion-resistant fasteners as recommended by the roof membrane manufacturer and meeting the requirements
of FM 4470 and FM P7825c for Class I roof deck construction and the wind uplift resistance specified. As supplied
and warranted for the substrate type(s) by EPDM sheet manufacturer and recommended by EPDM sheet manufacturer's
printed data.
2.1.8.1 Stress Plates for Fasteners
Flat corrosion-resistant round stress plates as recommended by the roof membrane manufacturer's printed instructions
and meeting the requirements of FM 4470; not less than 50 mm 2 inch in diameter. Provide pre-formed discs to
prevent dishing or cupping.
2.1.8.2 Auxiliary Fasteners
Corrosion resistance screws, nails, or anchors suitable for intended attachment purpose and as recommended by
the roof membrane manufacturer.
2.1.8.3 Powder-Driven Fasteners
Powder-driven fasteners may be used only when approved in writing.
2.1.8.4 Metal Disks
Provide flat metal disks of minimum 25 mm 1 inch in diameter. Metal disks must be of nonferrous material compatible
with the nails or fasteners.
[2.1.9 Ballast
NOTE: Delete these paragraphs unless loose-laid ballasted system is specified.
Normally specify stone ballast for a ballasted system. Specify paver ballast
when:
a. There is danger of aggregate being drawn into air intakes of jet aircraft.
b. There is danger of wind-blown aggregate jeopardizing property and life safety.
c. In wind zones exceeding 160 km/h 100 mph, within 8 km 5 miles of coastline,
within 457 m 1500 feet of open body of water, and on or adjacent to critical
facilities such as hospitals.
d. Heavy foot traffic over large areas of roof is expected.
[2.1.9.1 Stone Ballast
Smooth, rounded, river-washed stone graded in accordance with ASTM D 448, sizes 1, 2, 24, 3, and 4, nominal 19
mm to 38 mm 3/4 inch to 1-1/2 diameter, except as recommended otherwise by the roof membrane manufacturer and
approved by the Contracting Officer.
][2.1.9.2 Ballast Pavers
NOTE: Specify paver weight based on calculated wind load conditions and ANSI/RMA/SPRI RP-4.
Lightweight interlocking paver ballast may be used in lieu of heavier weight
non-interlocking pavers in wind zones in excess of 160 km/h 100 mph, within
8 km 5 miles of coastline or within 457 m 1500 feet of open body of water.
Non-interlocking pavers should weight not less than 88 kg per square meter 18
pounds per square foot.
Elevated paver systems and pavers intended to support pedestrian traffic, such
as plaza decks or observation decks, should be minimum 50 mm 2 inch thick, 600
mm 24 inch square, and minimum 51,700 kPa 7500 psi compressive strength.
Specify paver pedestrals for pavers without drainage channels. Specify adjustable
pedestals for systems required to be elevated to a level plane such as a plaza
or observation deck.
Provide weather resistant, precast [interlocking] concrete roof pavers [with drainage channels on the underside],
and as recommended by the roof membrane manufacturer. Provide pavers of minimum 20,680 kPa 3000 psi 51,700 kPa
7500 psi compressive strength, weigh not less than 58 kg per square meter 12 pounds per square foot 88 kg per
square meter 18 pounds per square foot [_____], not less than 30 mm 1-1/4 inch 50 mm 2 inch thick and nominal
600 mm 24 inch [_____] in length and width and without sharp edges and projections. [Elevate pavers above the
roof membrane surface with paver manufacturer's recommended [adjustable] pedestal system [to provide for level
walking surface] as required by the roof membrane manufacturer.]
]][2.1.10 Protection Mat / Slip Sheet
NOTE: Specify protection mat for application between roof membrane and ballast
when ballasted systems are specified.
Minimum 154 gram per square meter 4.5 ounce per square yard 200 gram per square meter 6 ounce per square yard
ultraviolet resistant polypropylene, non-woven, needle punched fabric for use as protection mat under ballast
system and as recommended by the roof membrane manufacturer.
][2.1.11 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 roof membrane manufacturer.
[2.1.11.1 Pre-fabricated Curbs
Provide [_____] gauge [G90 galvanized][AZ55 galvalume][_____] curbs with minimum 100 mm 4 inch flange for attachment
to roof nailers. Provide minimum height of 250 mm 10 inch above the finished roof membrane surface.
]][2.1.12 [Rubber Walkboards] [and] [Precast Concrete Paver Block Walkways]
NOTE: Use pavers or rubber walkboards as walkways where the roof or areas of
the roof are intended to bear foot traffic for maintenance or other purposes
once per month or more frequently.
Provide [either of] the following:
[2.1.12.1 Rubber Walkboards
Preformed reprocessed rubber, compatible with the EPDM sheet, 6 mm 1/4 inch minimum thickness, and weighing not
less than .68 kg per square meter 1-1/2 pounds per square foot.
][2.1.12.2 Precast Concrete Paver Block
Precast concrete blocks, 450 mm by 450 mm 18 inch by 18 inch 600 mm by 600 mm 24 inch by 24 inch, without sharp
edges and projections, and weighing no more than 20 kg 45 pounds 36 kg 80 pounds each.
]]2.1.13 Roof Insulation Below EPDM Sheet
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 is applied.
Do not fully adhere single ply membrane to perlite, polystyrene, or standard
wood fiber insulation board. High density wood fiber board is acceptable if
approved by the roof membrane manufacturer for the wind resistance condition
specified.
Coordinate insulation system attachment with the wind resistance requirements.
In many instances, insulation system must be adhered or mechanically fastened
to deck in corner and perimeter areas, if not throughout the field of the roof,
when specifying a ballasted roof system.
Insulation system and facer material must be compatible with membrane application specified and as approved by
the roof membrane manufacturer.
2.1.14 Wood Products
NOTE: Coordinate with Section 06 10 00 ROUGH CARPENTRY. Some fire retardant
treatment (FRT) chemicals may affect EPDM materials. MSDS listing active ingredients
for the FRT wood must be submitted to EPDM manufacturer prior to applying EPDM
materials in contact with FRT wood.
Do not allow fire retardant treated materials be in contact with EPDM membrane or EPDM accessory products, unless
approved by the membrane manufacturer and the Contracting Officer.
2.1.15 Membrane Liner
[Self-adhering ]EPDM membrane liner conforming to ASTM D 4637, or other waterproof membrane liner material as
approved by the roof membrane manufacturer and the Contracting Officer.
2.2 FLASHING CEMENT
Provide a self-vulcanizing butyl compound flashing cement for splicing laps and for flashings workable at minus
7 degrees C 20 degrees F. Obtain a recommendation for such flashing cement from the roofing membrane manufacturer.
PART 3 EXECUTION
3.1 EXAMINATION
Ensure that the following conditions exist prior to application of the roofing materials:
a. [Drains,] [curbs,] [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.
c. The plane of the substrate does not vary more than 6 mm 1/4 inch within an area 3 by 3 meters
10 by 10 feet when checked with a 3 meter 10 foot straight edge placed anywhere on the substrate.
d. Substrate is sloped to provide positive drainage.
e. Walls and vertical surfaces are constructed to receive counterflashing, 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 200 mm 8 inch above finished roofing surface.
NOTE: Coordinate with Section 06 10 00 ROUGH CARPENTRY to ensure that preservative
treatment is specified for wood which will be in contact with roofing components.
g. Pressure-preservative 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.]
h. Avoid contact of EPDM materials with fire retardant treated wood, except as approved by
the roof membrane manufacturer and Contracting Officer.
NOTE: Wood cants should also be used where there are non-wall supported flashings
at wood blocking forming area dividers and expansion joints, and at wall and
roof intersections where roof deck is not supported on wall.
i. 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 89 mm
3-1/2 inch.
NOTE: Include venting provision for wet fill substrate materials like lightweight
cellular concrete.
[j. 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.]
][k. 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 mm 1/4 inch in width or greater. [Joints
in plywood substrates are taped or otherwise sealed to prevent air leakage from the underside.]]
[l. Insulation boards are installed smoothly and evenly, and are not broken, cracked, or curled.
There are no gaps in insulation board joints exceeding 6 mm 1/4 inch in width. Insulation is
being roofed over on the same day the insulation is installed.]
3.2 APPLICATION
NOTE: Coordinate application method with paragraphs "Description of Roof Membrane
System" and appropriate subparagraph under "EPDM Sheet Roofing".
Apply entire EPDM sheet utilizing [fully adhered] [loose-laid ballasted] [mechanically fastened] [combined fully
adhered and mechanically fastened] application method[s]. Apply roofing materials as specified herein unless
approved otherwise by the Contracting Officer.
3.2.1 Special Precautions
a. Do not dilute coatings or sealants unless specifically recommended by the materials manufacturer's
printed application instructions. Do not thin liquid materials with cleaners used for cleaning
EPDM sheet.
b. Keep liquids in airtight containers, and keep containers closed except when removing materials.
c. Use liquid components, including adhesives, within their shelf life period. Store adhesives
at 15 to 27 degrees C 60 to 80 degrees F prior to use. Avoid excessive adhesive application
and adhesive spills, as they can be destructive to some elastomeric sheets and insulations;
follow adhesive manufacturer's printed application instructions. Mix and use liquid components
in accordance with label directions and manufacturer's printed instructions.
d. Provide clean, dry cloths or pads for applying membrane cleaners and cleaning of membrane
e. Do not use heat guns or open flame to expedite drying of adhesives or primers.
f. Require workmen and others who walk on the membrane to wear clean, soft-soled shoes to avoid
damage to roofing materials.
g. Do not use equipment with sharp edges which could puncture the EPDM sheet.
h. Shut down air intakes and any related mechanical systems and seal open vents and air intakes
when applying solvent-based materials in the area of the opening or intake. Coordinate shutdowns
with the Contracting Officer.
3.2.2 EPDM Sheet Roofing
Provide a watertight roof membrane sheet free of contaminants and defects that might affect serviceability.
Provide a uniform, straight, and flat edge. Unroll EPDM sheet roofing in position without stretching membrane.
Inspect for holes. Remove sections of EPDM sheet roofing that are damaged. Allow sheets to relax minimum 30
minutes before seaming. Lap sheets as specified, to shed water, and as recommended by the roof membrane manufacturer's
published installation instructions for the application required but not less than 75 mm 3 inch in any case.
3.2.3 Application Method
[3.2.3.1 Combined Fully Adhered and Mechanically Fastened Application
NOTE: Delete this paragraph unless a combined fully adhered and mechanically
fastened application is specified. Where this paragraph is included, include
and edit the fully adhered and mechanically fastened membrane application paragraphs
to remove redundancy of requirements.
Install combined fully adhered and mechanically fastened roof membrane system in the manner specified and including
seaming, perimeter and infield fastening and half sheets.
][3.2.3.2 Fully Adhered Membrane Application
NOTE: Delete this paragraph unless a fully adhered or combined fully adhered
and mechanically fastened application is specified.
Delete the bracketed option in the fourth sentence and delete the fifth sentence
when non-standard adhesives are specified such as sprayed foam or hot asphalt
used with fleece-backed membrane.
Layout membrane and side lap adjoining sheets in accordance with membrane manufacturer's printed installation
instructions. Allow for sufficient membrane to form proper membrane terminations. Remove dusting agents and
dirt from membrane and substrate areas where bonding adhesives are to be applied. Apply specified adhesive evenly
and continuously to substrate [and underside of sheets] at rates recommended by the roof membrane manufacturer's
printed application instructions. When adhesive is spray applied, roll with a paint roller to ensure proper
contact and coverage. Do not apply bonding adhesive to surfaces of membrane in seam or lap areas. Allow adhesive
to flash off or dry to consistency prescribed by manufacturer before adhering sheets to the substrate. Roll
each sheet into adhesive slowly and evenly to avoid wrinkles; broom or roll the membrane to remove air pockets
and fishmouths and to ensure full, continuous bonding of sheet to substrate. Form field lap splices or seams
as specified. Check all seams and ensure full lap seal. Apply lap sealant to all adhesive formed seams and
all cut edges of reinforced membrane materials.
][3.2.3.3 Mechanically Fastened Membrane Application
NOTE: Delete this paragraph unless a mechanically fastened or combined fully
adhered and mechanically fastened application is specified.
Membrane side lap depends on method of mechanical attachment, wind resistance
testing of the specific system provided, and requirements of the membrane manufacturer.
Generally, attachments must be positioned such that minimum 75 mm 3 inch seam
width remains beyond the outer edge of the attachment plate or batten strip.
Fastener and plate attachment typically requires 175 mm to 200 mm 7 to 8 inch
membrane overlap. Batten attachment typically requires 100 mm to 150 mm 4 to
6 inch membrane overlap.
Layout membrane and lap adjoining sheets in accordance with membrane manufacturer's printed instructions such
that a minimum 75 mm 3 inch [_____] seam width is maintained and seam width is as required by tested assembly
meeting specified wind resistance requirements. Account for additional overlap required for placement of fasteners
and plates or battens beyond the closed seam. Allow for sufficient membrane to form proper membrane terminations.
Ensure membrane is free of wrinkles and ridges in the installation. Mechanically secure the membrane sheet with
specified fasteners in the lap area. Space fasteners as required to provide the wind uplift resistance specified
and in accordance with submitted fastener patterns for the field, corner, and perimeter roof areas. Set fasteners
firm to plate or batten. Form field lap splices or seams as specified. Check all seams and ensure full lap
seal. Apply lap sealant to all adhesive formed seams and all cut edges of reinforced membrane materials.
][3.2.3.4 Ballasted Membrane Application
NOTE: Delete this paragraph unless a loose-laid ballasted application is specified.
Layout membrane and side lap adjoining sheets minimum 100 mm 4 inch and according to membrane manufacturer's
printed instructions. Allow for sufficient membrane to form proper membrane terminations. Ensure membrane is
free of wrinkles and ridges in the installation. Form field lap splices or seams as specified and of width required
by the membrane manufacturer's installation instructions. Check seams to ensure continuous seal before proceeding
with further work. Apply continuous lap sealant to all adhesive formed seams and all cut edges of reinforced
membrane materials.
]3.2.4 Tape Seams / Lap Splices
NOTE: Seam tape must be the primary seaming, or lap splice, technique. Adhesive
seaming in the field of the roof must only be specified with Government approval.
Adhesive seaming of flashing in limited areas may be required where tapes are
difficult to apply.
Field form seams, or lap splices, with seam tape in accordance with membrane manufacturer's printed instructions
and as specified. Clean and prime mating surfaces in the seam area. After primer has dried or set in accordance
with membrane manufacturer's instructions, apply seam tape to bottom membrane and roll with a 75 mm to 100 mm
3 inch to 4 inch wide smooth silicone or steel hand roller, or other manufacturer approved rolling device, to
ensure full contact and adhesion of tape to bottom membrane. Tape end laps must be minimum 25 mm 1 inch. Roll
top membrane into position to check for proper overlap and alignment. Remove release paper from top of seam
tape and form seam splice. Ensure top membrane contact with seam tape as release paper is removed. Roll the
closed seam with a smooth silicone or steel hand roller, rolling first across the width of the seam then along
the entire length, being careful not to damage the membrane. Apply minimum 225 mm 9 inch long strip of membrane-backed
flashing tape over T-intersections of roof membrane. Roll tape to ensure full adhesion and seal over T-joint.
[3.2.5 Adhesive Seams / Lap Splices
NOTE: Include the bracketed option in the first sentence as the norm. Government
approval required for adhesive formed seams in the field of the roof.
Use only field-applied adhesive formed seams [in flashing areas] where approved by the membrane manufacturer
and the Contracting Officer. Do not use adhesive formed seams for field of roof membrane seaming[, except as
approved by the membrane manufacturer and the Contracting Officer]. Thoroughly and completely clean mating surfaces
of materials throughout the lap area. Remove all dirt, dust, and contaminants and allow to dry.
Apply primer as recommended by the membrane manufacturer. Apply splice adhesive with a 75 mm to 100 mm 3 inch
to 4 inch wide, 13 mm 1/2 inch thick, solvent-resistant brush in a smooth, even coat with long brush strokes.
Bleed out brush marks. Do not apply adhesive in a circular motion. Simultaneously apply adhesive to both mating
surfaces in an approximate 0.63 mm to 0.75 mm 0.025 to 0.030 inch wet film thickness, or other thickness as recommended
by the roof membrane manufacturer's printed instructions.
Allow the splice adhesive to set-up in accordance with membrane manufacturer's printed instructions. Perform
manufacturer recommended field check to test for adhesive readiness prior to closing seam. Apply a 3 mm to 6
mm 1/8 inch to 1/4 inch bead of in-seam sealant approximately 13 mm 1/2 inch from the inside edge of the lower
membrane sheet prior to closing the seam. Ensure the in-seam sealant does not extend onto the splice adhesive.
Maintain the full adhered seam width required. Roll the top membrane onto the mating surface. Roll the seam
area with a 50 mm to 75 mm 2 inch to 3 inch wide, smooth silcone or steel hand roller. A minimum of 2 hours
after joining sheets and when the lap edge is dry, clean the lap edge with membrane manufacturer's recommended
cleaner and apply a 6mm to 9 mm 1/4 inch to 3/8 inch bead of lap sealant centered on the seam edge. With a feathering
tool, immediately feather the lap sealant to completely cover the splice edge, leaving a mound of sealant over
the seam edge. Apply lap sealant to all adhesive formed seams.
]3.2.6 Perimeter Attachment
NOTE: All application methods of EPDM membranes require mechanical fastening
of the membrane to wood nailers at the roof perimeters, at angular penetrations,
or at circular penetrations, except roof drains greater than 18 inch in diameter.
Adhesive bond or mechanically secure roof membrane sheet at roof perimeter in a manner to comply with wind resistance
requirements and in accordance with membrane manufacturer's printed application instructions. When adhesively
bonding a mechanically fastened system in perimeter areas, the perimeter boundary of the adhesive bond must be
the same as the boundary required for additional perimeter mechanical fastening to meet wind resistance requirements.
3.2.7 Securement at Base Tie-In Conditions
Mechanically fasten the roof membrane at penetrations, at base of curbs and walls, and at all locations where
the membrane turns and angle greater than 4 degrees (1:12). Space fasteners a maximum of 300 mm 12 inch on center,
except where more frequent attachment is required to meet specified wind resistance or where recommended by the
roof membrane manufacturer. Flash over fasteners with a fully adhered layer of material as recommended by the
roof membrane manufacturer's printed data.
3.3 FLASHINGS
3.3.1 General
Provide flashings in the angles formed at walls and other vertical surfaces and where required to make the work
watertight, except where metal flashings are indicated.
Provide a one-ply flashing membrane, as specified for the system used, and install immediately after the roofing
membrane is placed and prior to finish coating where a finish coating is required. Flashings must be stepped
where vertical surfaces abut sloped roof surfaces. Provide sheet metal reglet in which sheet metal cap flashings
are installed of not more than 400 mm 16 inch nor less than 200 mm 8 inch above the roofing surfaces. Exposed
joints and end laps of flashing membrane must be made and sealed in the manner required for roofing membrane.
3.3.2 Membrane Flashing
NOTE: Coordinate flashing requirements with Section 07 60 00.00 40 FLASHING
AND SHEET METAL and details. Ensure Section 07 60 00.00 40 FLASHING AND SHEET
METAL is properly edited for application to EPDM roofing systems and for inclusion
of flashing conditions of the project.
Install flashing and flashing accessories as the roof membrane is installed. Apply flashing to cleaned surfaces
and as recommended by the roof membrane manufacturer and as specified. Utilize cured EPDM membrane flashing
and prefabricated accessory flashings to the maximum extent recommended by the roof membrane manufacturer. Limit
uncured flashing material to reinforcing inside and outside corners and angle changes in plane of membrane, and
to flashing scuppers, pourable sealer pockets, and other formed penetrations or unusually shaped conditions as
recommended by the roof membrane manufacturer where the use of cured material is impractical. Extend base flashing
not less than 200 mm 8 inch above roofing surface and as necessary to provide for seaming overlap on roof membrane
as recommended by the roof membrane manufacturer.
Seal flashing membrane for a minimum of 75 mm 3 inch on each side of fastening device used to anchor roof membrane
to nailers. Completely adhere flashing sheets in place. Seam flashing membrane in the same manner as roof membrane,
except as otherwise recommended by the membrane manufacturer's printed instructions and approved by the Contracting
Officer. Reinforce all corners and angle transitions by applying uncured membrane to the area in accordance
with roof membrane manufacturer recommendations. Mechanically fasten top edge of base flashing with manufacturer
recommended termination bar fastened at maximum 300 mm 12 inch on center. Install sheet metal flashing over
the termination bar in the completed work. Mechanically fasten top edge of base flashing for all other terminations
in a manner recommended by the roof membrane manufacturer. 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.
[3.3.3 Flashing at Roof Drain
NOTE: Include this paragraph when roof drains are indicated.
Provide a tapered insulation sump into the drain bowl area. Do not exceed tapered slope of (4:12) 18 degrees
for unreinforced membrane and (1:12) 5 degrees for reinforced membrane. Provide tapered insulation with surface
suitable for adhering membrane in the drain sump area. Avoid field seams running through or within 600 mm 24
inch of roof drain, or as otherwise recommended by the roof membrane manufacturer. Adhere the membrane to the
tapered in the drain sump area. Apply water block mastic and extend membrane sheets over edge of drain bowl
opening at the roof drain deck flange in accordance with membrane manufacturer's printed application instructions.
Insure membrane free of wrinkles and folds in the drain area. Securely clamp membrane in the flashing clamping
ring. Ensure membrane is cut to within 20 mm 3/4 inch of inside rim of clamping ring to maintain drainage capacity.
Do not cut back to bolt holes. Retrofit roof drains must conform to ANSI/SPRI RD-1.
][3.4 PRE-FABRICATED CURBS
Securely anchor prefabricated curbs to nailer or other base substrate and flashed with EPDM membrane flashing
materials.
3.4.1 Set-On Accessories
Where pipe or conduit blocking, supports and similar roof accessories, or isolated paver block, are set on the
membrane, adhere reinforced membrane or walkpad material, as recommended by the roof membrane manufacturer, 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.
3.4.2 Lightning Protection
Flash lightning protection system components or attach to the roof membrane in a manner acceptable to the roof
membrane manufacturer.
3.4.3 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 roof membrane manufacturer's printed instructions. Provide minimum 150 mm
6 inch separation between adjacent walkpads to accommodate drainage.
3.4.4 Elevated Metal [Walkways] [and] [Platforms]
Provide for protection of roof membrane by placing reinforced membrane or walkpad material, or other material
approved by the Contracting Officer, at all surface bearing support locations.
[3.4.5 Isolated 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 reinforced membrane or walkpad applied over the completed roof membrane.
][3.4.6 [Stone][Paver] Ballast [Paver System]
NOTE: Indicate the appropriate ballast type. Indicate ballast weight required
based on wind loading conditions.
In some instances paver ballast may be used in perimeter and corner areas in
combination with stone ballast in the field of the roof. If so, include the
[Paver] option in item "a".
Where elevated paver system is required, refer to as "Paver System" in the paragraph
title. Delete bracketed options related to protection mat installation, stone
ballast, and coverage rates. The paver type and weight must be as specified
in Part 2.
Complete all membrane and membrane flashing work, including inspection and repair of all membrane and seams in
the area of [ballast][paver] application prior to applying [ballast][paver] system. [Install protection mat
over roof membrane in accordance with roof membrane manufacturer's recommendations. Provide minimum 75 mm 3
inch side laps and 150 mm 6 inch end laps. Turn mat up vertical surfaces to extend 50 mm 2 inch above ballast.
Immediately after placement of protection mat,][Install and level pedestal system in accordance with manufacturer's
requirements and] apply [stone][and][paver] [ballast][system.] [at the following coverage rates:
a. [Pavers: ][_____] pounds per square foot for perimeter and corner areas of roof.
b. [_____] pounds per square foot for field of roof.
In no case apply ballast at a coverage rate less than 10 pounds per square foot or more than [_____] pounds per
square foot.]
]3.4.7 Correction of Deficiencies
Where any form of deficiency is found, additional measures must be taken as deemed necessary by the Contracting
Officer to determine the extent of the deficiency and corrective actions must be as directed by the Contracting
Officer.
3.4.8 Clean Up
Remove debris, scraps, containers and other rubbish and trash resulting from installation of the roofing system
from job site each day.
]3.5 PROTECTION OF APPLIED ROOFING
At the end of the day's work and when precipitation is imminent, protect applied membrane roofing system from
water intrusion.
[3.5.1 Water Cutoffs
NOTE: Include this paragraph when roof insulation is a substrate for the EPDM
sheet roofing.
Straighten insulation line using loose-laid cut insulation sheets and seal the terminated edge of the roof membrane
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.
]3.5.2 Temporary Flashing for Permanent Roofing
Provide temporary flashing at drains, curbs, walls and other penetrations and terminations of roofing sheets
until permanent flashings can be applied. Remove temporary flashing before applying permanent flashing.
3.5.3 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.
3.6 FIELD QUALITY CONTROL
3.6.1 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. Equipment is in working order. Metering devices are accurate.
b. Materials are not installed in adverse weather conditions.
c. Substrates are in acceptable condition, in compliance with specification, prior to application of
subsequent materials.
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.
The proper number, type, and spacing of fasteners are installed.
Materials comply with the specified requirements.
All materials are properly stored, handled and protected from moisture or other damages. Liquid
components are properly mixed prior to application.
Membrane is allowed to relax prior to seaming. Adhesives are applied uniformly to both mating
surfaces and checked for proper set prior to bonding mating materials. Mechanical attachments
are spaced as required[, including additional fastening of membrane in corner and perimeter
areas as required.]
Membrane is properly overlapped.
Membrane seaming is as specified and seams are hand rolled to ensure full adhesion and bond
width. [In-seam sealant is applied when adhesive seams are used in the field of the roof.]
All seams are checked at the end of each work day.
Applied membrane is inspected and repaired as necessary prior to ballast installation.
[Membrane is fully adhered without ridges, wrinkles, kinks, fishmouths.]
Installer adheres to specified and detailed application parameters.
Associated flashings and sheet metal are installed in a timely manner in accord with the specified
requirements.
Ballast is within the specified weight range.
Temporary protection measures are in place at the end of each work shift.
[3.6.2 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 2nd and 3rd 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. Do not exceed additional inspections 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 overall
quality of work, deficiencies and any other concerns, and recommended corrective action.
][3.6.3 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 watertightness.
Plug roof drains and fill with water to edge of drain sump for 8 hours. Retrofit roof drains must conform to
ANSI/SPRI RD-1. 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.
]3.7 INSTRUCTIONS TO GOVERNMENT PERSONNEL
Furnish written and verbal instructions on proper maintenance procedures to designated Government personnel.
Furnish instructions by a competent representative of the roof 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 minimum 215 mm by 275 mm 8-1/2 inch by 11 inch 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 0.032 inch thick aluminum card for exterior display. 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 retarder; date of completion; installing contractor identification and
contact information; membrane manufacturer warranty expiration, warranty reference number, and contact information.
Install card at roof top or access location as directed by the Contracting Officer and provide a paper copy to
the Contracting Officer.