USACE / NAVFAC / AFCESA / NASA UFGS-07 54 19 (November 2008)
-----------------------------
Preparing Activity: USACE Superseding
UFGS-07 54 19 (April 2006)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 07 54 19
POLYVINYL-CHLORIDE (PVC) ROOFING
11/08
NOTE: This guide specification covers the requirements for ENERGY STAR labeled
reinforced polyvinyl chloride roofing 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).
PART 1 GENERAL
NOTE: This guide specification is intended for both new construction and reroofing
installations. This guide specification is also applicable for use with a supplemental,
chemical/grease-resistant PVC membrane for roof areas in need of additional
roof protection such as adjacent to kitchen or food service exhaust system discharge
ducts; consult PVC membrane roof system manufacturer for this application.
Supplemental grease, chemical and oil-resistant PVC roofing membranes are available.
Custom-color PVC membrane roofing materials, such as those not bearing the ENERGY
STAR label, are available. The use of PVC membrane roofing in alternative colors
(other than those bearing the ENERGY STAR label) is discouraged, but is appropriate
with specific operational justification.
The standard application method for installing ENERGY STAR-labeled PVC membrane
roof systems include the construction of both adhered and mechanically fastened
roof system assemblies.
For excessive wind loading conditions, the mechanically fastened PVC membrane
roofing system included in this section provides a special, engineered bar and
coverstrip application wherein an anchoring bar is placed at calculated intervals
over loose laid, hot-air-welded, PVC membrane. The mechanically fastened anchoring
bars are subsequently weatherproofed with a hot-air-welded PVC membrane coverstrip
creating a finished roofing surface. Also included in this section is a mechanically
fastened PVC membrane roofing system that provides a double-weld seaming technique
that involves a method for encapsulating a mechanically fastened polymer batten
within the area of the membrane seam. When specifying mechanically fastened
roof systems for excessive wind loading conditions, the PVC membrane roofing
system manufacturer should be consulted for roof system attachment guidance
and wind engineering and uplift calculation requirements.
Provided in this section are additional PVC membrane roofing system assemblies
and component configurations. Protective design and roof system configuration
can be appropriate for utilization by designers to help protect, with pavers,
an underlying PVC membrane roofing system from potential damage caused by extreme
weather events that might produce wind-blown projectile conditions. These conditions
can be experienced with greater regularity in certain geographic areas. For
such conditions, designers may choose to rely on a special, combination adhered/protected
PVC membrane roofing system configuration that utilizes the membrane roofing
manufacturer's supply of roofing pavers to help protect the underlying, adhered
PVC membrane roofing system from airborne debris.
Another option provided by this section for buildings that experience excessive
wind loading conditions is a PVC membrane roofing system assembly that can be
designed to utilize a felt-backed PVC membrane that is adhered to cellular lightweight
insulating concrete. Roofing systems comprised of felt-backed PVC roofing membrane
that is adhered to cellular lightweight concrete have the highest ratings tested
and exceed the stringent Dade County Florida building code by providing the
demonstrated performance functionality that is encountered in this hurricane
prone geographic area.
A loose-laid, paver ballasted PVC membrane roofing system assembly is also included
in this section that can be utilized and adapted by roof system designers.
Loose-laid PVC roofing membranes with specialized system component assemblies
can also be configured to accommodate inverted roof membrane assemblies (IRMA)
that are suitable for installations with high interior humidity conditions (such
as pools)and for garden-style ("Green") roofing systems. Loose-laid/paver ballasted,
and IRMA PVC membrane roofing systems can be utilized for other roof system
design purposes, including the existence of limited and/or restrictive flashing
heights.
PVC membrane roofing materials bearing the ENERGY STAR label are not mandatory
for unexposed roof membrane systems such as paver ballasted, IRMA, combination
adhered/protected membrane, or garden-style roofing systems because the reflective
surface of an ENERGY STAR-labeled PVC roofing membrane is obscured from view
and/or from the sun's direct radiation in such configurations.
The use of stone and gravel as ballast is not allowed in conjunction with any
PVC membrane roofing system assembly and should never be designed or installed
in conjunction with any PVC membrane roofing system.
This section must be coordinated with other roof system component specifications
including drains/plumbing, elevated metal walkways and platforms, rough carpentry,
insulation, and flashing and sheet metal flashing sections.
All components of the specified PVC membrane roofing system including, but not
limited to the roof membrane, the roof system insulation, any/all insulation
overlayment, the adhesives and fasteners, as well as the integration and installation
of all other roof system components, must be in accordance with the PVC membrane
roofing manufacturer's printed roof system installation instructions and should
always be subject to, and in compliance with, all applicable state and local
building codes and/or otherwise code-compliant as evidenced by the governing
code official's acceptance of the design of the PVC membrane roofing system.
PVC membrane roofing should not be adhered directly to polystyrene, perlite
or standard wood fiber insulation. Facer material on polyisocyanurate roof
insulation boards, or insulation overlayment boards can only be assumed compatible
with the adhesive of the specified PVC membrane roofing materials if and when
the roofing adhesives, roof insulation, overlayment boards and all other roof
system components are procured from the same PVC membrane roof manufacturer.
Glass mat, moisture resistant gypsum roof board can be used as an overlayment
above and in conjunction with the roof system insulation to impart improved
wind, impact, and hail resistance.
Reinforced PVC membrane roofing should not be used in direct physical contact
with asphalt, coal tar pitches, nor petroleum-based products. For additional
guidance on ENERGY STAR-labeled PVC roofing membrane and material compatibility,
the designer should always consult the PVC roofing membrane manufacturer.
The integrity of hot-air-welded seams are characteristic of the unique utility
of an ENERGY STAR-labeled PVC roofing membrane and allow for reliable performance
under common hydrostatic pressure conditions (beneath standing/ponded water).
The occurrence of standing/ponded water does not void or nullify the warranty
coverage of most PVC membrane roofing system warranties, but its functionality
is limited, and subject always, to the structural capacity of both the roof
deck and the underlying building. Unlike the guarantees supplied by many alternative
roofing systems, the specified ENERGY STAR-labeled PVC membrane roofing manufacturer
offers a warranty that does not nullify its performance guarantee due to the
occurrence of standing/ponded water.
All roofs should be constructed to drain with a minimum slope of 20 mm per meter
(1/4 inch per foot). Subject always to building code compliance and/or code
official's approval, ENERGY STAR-labeled PVC roofing membrane can be specified
for existing buildings in need of reroofing in situations where the existing
conditions are restrictive to a designer's options. Such conditions might include
the inheritance of limited structural slope (less than 20 mm per meter (1/4
inch per foot)) and/or limited flashing heights, or when designer preference
or certain project-specific conditions dictate and/or prohibit the use of elaborate,
tapered insulation systems.
The combination adhered/protected PVC membrane roofing system can be applied
to roofs having slopes up to 165 mm per meter (2 inches per foot).
Roof expansion joints must be provided at each expansion joint in the structure,
at each change in deck material, and at each intersection where a roof deck
changes direction. Expansion joints and curb dividers in the membrane should
be located at high points where practicable.
All flashing heights, including but not limited to top of nailers for curbs
and area dividers should be at least 200 mm (8 inches) above surface of finished
roof. Expansion joints should not interfere with drainage. Do not use flush
type joints.
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 SOCIETY OF CIVIL ENGINEERS (ASCE)ASCE 7(2005; Supp 1) Minimum Design Loads for Buildings and Other Structures][ASTM INTERNATIONAL (ASTM)ASTM D 4434(2006) Poly(Vinyl Chloride) Sheet RoofingASTM D 6754(2002) Standard Specification for Ketone Ethylene Ester Based Sheet RoofingASTM E 108(2007a) Fire Tests of Roof Coverings][FM GLOBAL (FM)FM 4470(1986; R 1992) Class I Roof CoversFM P7825(2005) Approval Guide][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 SYSTEM DESCRIPTION
NOTE: Coordinate with PART 2, select the application method required and delete
other options.
Where PVC membrane roofing is utilized, in either adhered, mechanically fastened,
combination adhered/protected membrane and paver ballasted system configurations,
the preferred norm is to attach the PVC membrane roof over a minimum, two layer
assembly of rigid board roof insulation (this norm does not apply to IRMA or
garden-style roofs). Additionally, adhered and mechanically fastened PVC membrane
roofing systems must utilize reinforced membrane, always. Exception to use
of reinforced PVC membrane is given only for specialized, pre-fabricated PVC
roof system detail flashings (not deck sheet) that are supplied, warranted and
recommended in the printed instructions published by the specified PVC membrane
roof system manufacturer.
Stone and/or gravel ballast will not be utilized on any PVC membrane roofing system.
Adhered and mechanically fastened systems are preferred 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 an open body of water, and on or adjacent to critical
facilities such as hospitals; but a combination adhered/protected membrane system
utilizing paver ballast can be specified using interlocking pavers designed
to both protect the underlying PVC membrane from airborne projectiles and to
help provide the required wind load resistance established by local building
code and designer preference.
Combination adhered/protected roof membrane attachment should only be specified
for isolated geographic locations that experience extreme and extended wind
conditions such as portions of Alaska, Iceland, Florida and the Gulf coast,
or as otherwise required by the Government. Other mechanically fastened or
adhered PVC membrane roof system installation configurations are also accommodative
to such excessive wind loading conditions.
Where an air barrier is required, it should be applied at the deck level or
within the insulation sandwich. Air barriers are specified in Section
07 22 00 ROOF AND DECK INSULATION.
Where one membrane system configuration is required for all roof areas, use
the first paragraph. Where different system configurations 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.
[Adhered] [Mechanically fastened] [Combination adhered/protected membrane] [Loose-laid, paver ballasted] [IRMA]
[Garden-style] PVC roof membrane system applied over [insulation] [recovery board] [concrete roof deck] [cellular
lightweight insulating concrete] [PVC membrane roofing manufacturer-accepted] substrate. [Incorporate air barrier
in the roof assembly as specified in Section 07 22 00 ROOF AND DECK INSULATION.]
[_____]: [Adhered] [Mechanically fastened] [Combination adhered/protected membrane] [Loose-laid, paver ballasted]
[IRMA] [Garden-style] PVC roof membrane system applied over [insulation] [recovery board] [concrete roof deck]
[cellular lightweight concrete] [PVC membrane roofing manufacturer-accepted] substrate. [Incorporate air barrier
in the roof assembly as specified in Section 07 22 00 ROOF AND DECK INSULATION.]
1.2.1 General
NOTE: For guidance on flashings and drainage details, the designer should consult
the SMACNA "Architectural Sheet Metal Manual."
Roofing membrane sheet widths shall be consistent with membrane attachment methods and wind uplift requirements,
and shall be as large as practical. In order to minimize joints and 3-way overlaps, prefabricated sheets are
not accepted. Membrane shall be free of defects and foreign material. Coordinate flashing work to permit continuous
roof-surfacing operations. Insulation shall be applied and weatherproofed on the same day.
1.2.2 Fire Resistance
Complete roof system assembly shall:
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 or FM RoofNav (www. roofnav.com).
FM or UL approved components of the roof covering assembly shall bear the appropriate FM or UL label.
1.2.3 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.
Paver ballast for combination adhered/paver ballasted application, or for loose-laid
membrane applications should be designed in accordance with ANSI/RMA/SPRI RP-4.
Where paver ballasted systems are specified, include the bracketed option at
the end of the paragraph.
Complete roof covering assembly, including insulation, shall be rated Class 1-[60][90][_____] in accordance with
FM RoofNav (www. roofnav.com) or FM P7825 and capable of withstanding an uplift pressure of [2.85] [4.30] [_____]
kPa/square m [60] [90] [_____] psf. Non-rated systems shall not be installed[, 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. Base wind uplift calculations on a design wind speed of [_____]
km/h mph in accordance with ASCE 7[ or applicable building code requirements]. [Resistance to wind uplift for
combination adhered/protected membrane (paver ballasted) application shall be in accordance with requirements
of SPRI RP-4.]
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
Detail Drawings[; G][; G, [_____]]
Roof plan depicting wind loads 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 shall reflect the project roof plan of each
roof level and conditions indicated.
SD-03 Product Data
NOTE: Edit the product data submission requirements as necessary for the PVC
membrane roof system specified. Include bracketed requirements as applicable
to the system being specified.
PVC Roofing Membrane[; G][; G, [_____]]
Bonding Adhesive
Flashing
Membrane Fasteners and Plates
[Ballast Pavers]
Roof Insulation
[Protection Mat]
[Pre-manufactured accessories]
Water Cutoffs
Information Card
Data as required by Section 07 22 00 ROOF AND DECK INSULATION together with requirements of
this section. Data shall include written acceptance by the roof membrane manufacturer of the
insulation and other products and accessories to be provided by and warranted under the full
system guarantee of the roof membrane manufacturer. Products shall 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: Incorporate this submittal for loose-laid paver ballasted systems, IRMA
systems, garden-style roofing systems and anytime non-FM rated systems are permissible
and always for roofs subject to excessive wind loading conditions including
all geographic locations that experience extreme and extended wind conditions
such as portions of Alaska, Iceland, Florida and the Gulf coast, or as otherwise
required by the Government. 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 ENERGY STAR-labeled PVC[; G][; G, [_____]]
Certificate from PVC membrane roofing manufacturer certifying that the roof membrane, meets
specified requirements.
Qualifications of Applicator[; G][; G, [_____]]
Certificate stating that the applicator meets requirements specified.
[Wind Uplift Resistance[; G][; G, [_____]]]
Fire Resistance[; G][; G, [_____]]
Roof system assembly [wind uplift and] fire rating classification listings.
Minimum Polymer Thickness[; G][; G, [_____]]
Certification from PVC membrane manufacturer that the proposed PVC membrane roofing product
meets the minimum polymer thickness specified.
warranty[; G][; G, [_____]]
Sample certificate
SD-08 Manufacturer's Instructions
NOTE: Edit the manufacturers instructive submission requirements as necessary
for the system specified. Include bracketed requirements only as applicable
to the system being specified.
Application Method[; G][; G, [_____]]
Instructions including pattern and frequency of mechanical attachments required in the field
for roof, corners, and perimeters to provide for the specified wind resistance
Membrane Flashing[; G][; G, [_____]]
Perimeter Attachment
Auxiliary Fasteners
[Protection mat]
[Pre-manufactured accessories]
cold weather[; G][; G, [_____]]
Detailed application instructions and standard manufacturer drawings altered as required by
these specifications. Explicitly identify in writing, differences between manufacturer's instructions
and the specified requirements.
SD-10 Operation and Maintenance Data
Instructions to Government Personnel
Copies of Material Safety Data Sheets for maintenance/repair materials.
1.4 QUALITY ASSURANCE
1.4.1 Qualification of ENERGY STAR-labeled PVC
NOTE: The EPA's ENERGY STAR Roof Products Program has established baseline
qualification criteria for roof surfaces that are attenuated at specific energy
efficient characteristics. The energy efficiency characteristics of the ENERGY
STAR Roof Products Program also address and affirm the durability of the prescribed
energy efficient characteristics in terms and conditions that ensure consistency
thresholds that established minimum thresholds to confirm the demonstrated performance
capabilities established by EPA. With respect to QUALITY ASSURANCE hereunder
- and for continuity with EPA's ENERGY STAR Roof Products Program - designers
shall, at a minimum, only specify ENERGY STAR-labeled PVC membrane roofing products
that provide a finished roof that offer a surface formulation possessing, at
a minimum, a 3-year performance history on installed roofs located within the
geographic boundaries of the United States. However, designers are also required
to specify a demonstrated PVC membrane roofing product with a performance capability
- measured in duration of years - that is at least as long, with respect to
the time-length specified, as the desired warranty/guarantee covering the entire
PVC membrane roofing system.
ENERGY STAR labeled PVC membrane roofing product shall have at least [3] [_____] years of demonstrated performance
experience.
1.4.2 Qualifications of Applicator
NOTE: Specify 3 years as an authorized Contractor unless directed otherwise
by the Government
PVC membrane roofing system Applicator shall be approved, authorized, or licensed in writing by the PVC membrane
roof manufacturer and shall have a minimum of [three] [_____] years experience as an approved, authorized, or
licensed applicator with that manufacturer's PVC membrane roofing materials and be approved at a level capable
of providing the specified warranty. The applicator shall 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 Conformance and Compatibility
The entire roofing and flashing system (including edge metal) shall be in accordance with specified and indicated
requirements, including fire and wind resistance requirements. Work not specifically addressed and any deviation
from specified requirements shall be in general accordance with recommendations of the NRCA 0405, membrane manufacturer
published recommendations and details and shall be compatible with surrounding components and construction.
Any deviation from specified or indicated requirements shall be submitted to the Contracting Officer and PVC
roof membrane manufacturer for approval prior to installation.
1.4.4 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.
Preroofing conference scheduling shall be coordinated with the Contracting Officer. The conference shall 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 a 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 shall 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 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 may
be required in cold weather subject to PVC membrane roofing manufacturer's printed instruction. 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 roll materials. Damaged materials shall not be installed 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, incompatible materials or moisture. Remove contaminated materials from the site. When hazardous
materials are involved, conform with 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
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 shall immediately follow application of insulation as a continuous operation. Roofing
operations shall be coordinated with insulation work so that all roof insulation applied each day is covered
with roof membrane installation the same day.]
1.8 WARRANTY
Provide a Full System Roof Warranty covering all PVC membrane roof system components as well as their installation
workmanship and meeting all specified requirements. Revision or amendment to standard full system PVC membrane
manufacturer warranty shall be provided as required to comply with the specified requirements.
1.8.1 PVC Membrane Manufacturer's Full Roof System Warranty
NOTE: Insulated and routinely occupied facilities or facilities containing
sensitive equipment or operations shall require a warranty of not less than
15 years. Designer may specify a 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 shall require minimum 10 year warranty regardless of facility size.
Furnish roof membrane manufacturer's [5][10][15][20]-year, no dollar limit, full roof system materials and installation
workmanship warranty, including all flashing, insulation, and accessory materials necessary to construct a complete,
watertight roof system. The warranty shall run directly from the roof system manufacturer to the Government
and commence at time of Government's acceptance of the roof work. The warranty shall 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 significant 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 shall be the responsibility
of the roof membrane manufacturer. All costs associated with the repair or replacement work shall be
the responsibility of the roof membrane manufacturer.
b. When the manufacturer and his approved applicator fail to perform the repairs within 72 hours of notification,
emergency temporary repairs performed by others shall not void the warranty.
1.8.2 Roofing System Installer Warranty
The roof system installer shall warrant for a period of not less than five (5) years that the roof system, as
installed, is free from defects in installation workmanship, to include the roof membrane, flashing, insulation,
accessories, all attachments, including installation of all PVC membrane manufacturer-supplied edge metal which
is always integral to a complete watertight roof system assembly. The warranty shall run directly to the Government.
Correction of defective workmanship and replacement of damaged or affected materials shall be the responsibility
of the roof system installer. All costs associated with the repair or replacement work shall be the responsibility
of the installer.
1.8.3 Continuance of Warranty
Any repair or replacement work that becomes necessary within the warranty period shall be approved by the roof
membrane manufacturer and accomplished in a manner so as to restore the integrity of the roof system assembly
and the validity of the roof membrane manufacturer warranty for the remainder of the manufacturer warranty period.
1.8.4 Single-Source Contract Liability Warranty
NOTE: Designers of ENERGY STAR-labeled PVC membrane roofing systems have the
option of specifying specific contracting requirements, hereunder, that establish
the qualification requirements for procuring a roofing system with either a
Single-Source Contract Liability Warranty (which encompasses the Qualification
of Applicator), or to specify contracting requirements for procuring said roofing
system via conventional contracting methodologies that establish the Qualification
of Applicator. According to conventional contracting methodologies, the primary
contract for a roof system application procured by the Government is signed
with an Applicator who furnishes a "third-party" guarantee with an extended
duration, in years. Typically, the "third-party" is the roof system manufacturer,
but the guarantee so furnished is contingent upon items outside the realm of
the roof system manufacturer's own contractual liability - which is limited.
Single-Source Contract Liability Warranties shall cover all roof system-related
guarantees, in whole and in part, related to all roof system component products,
as well as roof system design and roof system installation labor and workmanship.
The Single-Source Contract Liability Warranty shall assign all responsibility
and liability, including roof system component repair and/or replacement up
to and including, potentially, complete roof system or component roof system
replacement, as necessary, to return the condition of the procured roof to its
accepted functionality. The contractual assignment of responsibility for all
associated roof system guarantees related to a specified roofing system shall
inure to a single entity the roof system manufacturer. In making this type
of contract, the Government will thereby streamline and assign potential culpability
to the PVC membrane (roof system weatherproofing) manufacturer for any potential
discovery, at time of project delivery and acceptance or therein after, of any
post-construction discovery of deficiencies in roofing materials, design, and
workmanship. Contract shall not include damage to the roofing caused by others
and shall be governed by all terms and conditions of the roof system's underlying
Full System Warranty. The guarantee of a single-source contract liability warranty
and contract methodology will eliminate the "latent defect" assertion often
used by roofing material manufacturers to nullify roof system warranty coverage.
Warranty-nullifying assertions of latent defects has been a repetitive problem
that has, historically, been encountered by, and adjudicated to the detriment
of the Government.
Absent force majeure, casualty, neglect or abuse, a single-source contract liability
warranty provides the Government with a vehicle for assigning complete roof
system performance responsibility and liability with respect to multiple underlying
guarantees to the roof weatherproofing manufacturer, inclusive of all components
of the supplied roofing system, as well as the roofing system's design and installation
workmanship. As an instrument for wrapping liability, single-source contract
liability warranties deliver a clean guarantee to the Government for all roof
system warranty obligations and offer the Government a turn-key procurement
vehicle while providing a substantial risk management tool both during and after
construction that clearly assigns all appropriate and associated roof system
liability to the roof system weatherproofing material manufacturer. When specifying
the single-source contract liability warranty, designers must require roof system
manufacturers to comment on, or create, and/or modify all roof system specifications
and detail drawings and to accept and present the complete roof system design
specification package to qualified roofing subcontractors prior to project bidding
and furnish same to the Government prior contract award.
[_____]The specified, single-source contract liability warranty of a PVC membrane roofing system manufacturer
shall be furnished to the Government upon project completion. The single-source contract liability warranty
shall encompass all roof system components' warranty performance coverage's, including all performance guarantees
for roof system materials, roof system design and all roof system installation labor and workmanship. The single-source
contract liability warranty shall be a Full Roof System Warranty that is issued by either the PVC membrane roof
system manufacturer, or by a direct affiliate of the PVC membrane roof system manufacturer (100 percent owned
affiliate), or by an agent of the PVC membrane roof system manufacturer possessing the authority to contractually
bind the PVC membrane roof system manufacturer (manufacturer, affiliate and agent are collectively referred to
as "Roofing System Supplier") and to, at said agent's discretion, underwrite and/or provide for insurance covering
all of the respective warranty obligations of the PVC membrane manufacturer's Full Roof System Warranty.
a. The Government intends to sign a contract binding all warranty and associated roof system performance
guarantees of the roofing system directly with the PVC membrane roofing manufacturer, or it's subsidiary,
or an exclusive agent capable of enjoining said PVC membrane manufacturer; and
b. This roofing system shall be applied only by a roofing system Applicator authorized by the PVC membrane
roofing manufacturer prior to bid; and
c. The roofing system Applicator shall arrange with, and make arrangements to the satisfaction and discretion
of the PVC Roofing System Supplier, to have the services of a Technical Field Representative on site
full time to observe the total roof application, including removal of pre-existing roofing (if applicable).
The Technical Field Representative shall provide written daily reports to the Roofing System Supplier
and Applicator. The roofing system Applicator shall include the cost of the full-time Technical Field
Representative in his/her bid price; and
d. Bids must be submitted with approved detail drawings and specifications approved and furnished by
the PVC membrane manufacturer, and
e. There shall be no deviation made from the contract specification or the approved shop/detail drawings
without prior written approval by the both PVC membrane roofing material manufacturer/subsidiary and
by the Government; and
f. All work shall be completed by personnel trained and authorized by the PVC membrane roof manufacturer.
PART 2 PRODUCTS
2.1 MATERIALS
a. 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. Materials provided shall be free of defects and suitable for the service and
climatic conditions of the installation. All warranted roof system components must be sourced from the
PVC roof membrane manufacturer, including but not limited to all insulation, coverboards, accessories,
adhesives and edge metal.
b. 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 0.032 inch thick
aluminum card for exterior display. Card shall be 215 by 275 mm 8 1/2 by 11 inches minimum. Information
card shall 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.
2.1.1 Bonding Adhesive
NOTE: Bonding adhesive is used for adhering PVC membrane to materials other
than PVC.
Low VOC materials may be required in some geographic locations and for use upon
occupied buildings in order to minimize potential irritation to occupants.
For these instances, include the first bracketed option as applicable, delete
the second bracketed option, and write in a description of the adhesive required.
Consider peel & stick adhesion of PVC membranes in these instances.
Provide PVC membrane manufacturer's [low volatile organic compound (VOC)] [standard] membrane adhesive, as supplied
by roof membrane manufacturer, and recommended by the manufacturer's printed data for bonding of PVC membrane
materials to acceptable insulation, wood, metal, concrete or other acceptable substrate materials. Bonding adhesive
shall not be used to bond membrane materials to each other.
2.1.2 Water Cutoff Mastic/Water Block
As supplied by the roof membrane manufacturer and recommended by the manufacturer's printed data.
2.1.3 Membrane Flashing
Membrane flashing, including self-adhering membrane flashing, perimeter flashing, flashing around roof penetrations
and prefabricated pipe seals, shall be minimum polymer thickness 1.1 mm 0.045 inch reinforced PVC for 5, 10,
15 year warranties, and shall be utilized as recommended and supplied by the roof membrane manufacturer or minimum
1.5 mm 0.060 inch thick reinforced PVC roof membrane and flashing's for 20 year warranties.
2.1.4 Membrane Fasteners and Plates
Coated, corrosion-resistant fasteners as recommended and supplied by the PVC roof membrane manufacturer and meeting
the requirements of FM 4470 and FM RoofNav (www. roofnav.com) or FM P7825 for Class I roof deck construction
and the wind uplift resistance specified. Fasteners and Plates to be supplied and warranted for the substrate
type(s) by PVC membrane manufacturer and recommended by PVC membrane manufacturer's printed data.
2.1.4.1 Stress Plates, Bar or Rail for Fasteners
Corrosion-resistant stress plates as recommended by the roof membrane manufacturer's printed instructions and
meeting the requirements of FM 4470 must be utilized and must be supplied by PVC roof membrane manufacturer.
Stress plates shall be formed to prevent dishing or cupping. Manufacturer-supplied anchoring bar or rails may
be utilized for high wind conditions.
2.1.4.2 Auxiliary Fasteners
Corrosion resistance screws, nails, or anchors must be suitable for intended attachment purpose and be recommended
and supplied for use by the PVC roof membrane manufacturer.
[2.1.5 Ballast Pavers
NOTE: There is danger of wind-blown, airborne objects jeopardizing property
and life safety on facilities 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, or when heavy foot
traffic over large areas of roof is expected.
Specify paver pedestals 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.
Weather resistant, precast [interlocking] concrete roof pavers [with drainage channels on the underside], and
as recommended by the PVC roof membrane manufacturer. Pavers shall be minimum [20,680] [51,700] kPa [3000] [7500]
psi compressive strength, weigh not less than[ [58] [88] kg/per square m [12] [18] psf] [_____], not less than
[30] [50] mm [1-1/4] [2] inches thick and nominal [600 mm 24 inches] [_____] 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.]
][2.1.6 Protection Mat
NOTE: Specify protection mat for application between roof membrane and paver
ballast when combination adhered/protected membrane and loose-laid PVC membrane
roofing systems are specified without pedestals and for application between
roof membrane and insulation or other growth medium and system components for
IRMA and garden-style PVC membrane roofing systems .
Minimum [154] [200] gram/square m [4.5] [6] ounce/square yard ultraviolet resistant polypropylene, non-woven,
needle punched fabric for use as protection mat under ballast system or as recommended and supplied by the roof
membrane manufacturer.
][2.1.7 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 shall be manufacturer's standard for intended purpose, must comply with applicable
specification section, be compatible with the membrane roof system and approved for use and supplied by the PVC
roof membrane manufacturer. Pre-fabricated Curbs shall be [_____] gauge [G90 galvanized] [AZ55 galvalume] [_____]
with minimum 100 mm 4 inch flange for attachment to roof nailers. Curbs shall provide minimum height of 250
mm 10 inches above the finished roof membrane surface.
][2.1.8 [PVC Walk Tread] [and] [Precast Concrete Paver Block Walkways]
NOTE: Use pavers or PVC Walk Tread as pedestrian 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:
2.1.8.1 PVC Walk Tread
Scrim reinforced 2.4 mm 0.096 inch thickness PVC membrane with a textured surface, compatible with and supplied
by manufacturer of the PVC roof membrane.
2.1.8.2 Precast Concrete Paver Block
Precast concrete blocks (subject always to structutal capacity), [450 by 450] [600 by 600] mm [18 by 18] [24
by 24] inch, without sharp edges and projections, and weighing no more than [20] [36] kg [45] [80] pounds each.
][2.1.9 Elevated Metal [Walkways] [and] [Platforms]
As specified in Section 05 50 13 MISCELLANEOUS METAL FABRICATIONS, and as approved by the roof membrane manufacturer.
]2.1.10 Roof Insulation
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 and must be supplied by the PVC membrane manufacturer and guaranteed
under the PVC membrane roof manufacturer's full system warranty.
Do not adhere single ply PVC roof membrane to perlite, polystyrene, or standard
wood fiber insulation board.
Coordinate insulation system attachment with the wind resistance requirements.
In many instances, insulation system must be adhered or mechanically fastened
to deck with increased frequency in corner and perimeter areas, if not throughout
the field of the roof.
Insulation system and facer material shall be compatible with membrane application specified and be approved
and supplied by the PVC membrane roof manufacturer[and as specified in Section 07 22 00 ROOF AND DECK INSULATION].
2.1.11 Wood Products
NOTE: Coordinate with Section 06 10 00 ROUGH CARPENTRY. Some fire retardant
treatment (FRT) chemicals may affect PVC materials. MSDS listing active ingredients
for the FRT wood shall be submitted to PVC manufacturer prior to applying PVC
materials in contact with FRT wood.
As specified in Section 06 10 00 ROUGH CARPENTRY, except that fire retardant treated materials shall not be in
contact with PVC membrane or PVC accessory products, unless approved by the membrane manufacturer and the Contracting
Officer.
Text
2.2 ENERGY STAR-Labeled, Reinforced, PVC Membrane
NOTE: Refer to Designer Note in PART 1 for guidance regarding membrane attachment
method and in editing the membrane materials' requirements.
Specify minimum 1.1 mm (0.045 inch) thickness ASTM D4434 Type III, ASTM D4434
Type IV or ASTM D6754 reinforced ENERGY STAR labeled PVC 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. Alternately,
for roof 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, designers
can specify combination adhered/protected membrane systems (utilizing interlocking
pavers) acceptable to PVC membrane roof manufacturer.
For 20 year warranty, specify adhered membrane systems only to acceptable substrates
(consult PVC membrane manufacturer) or mechanically fastened PVC membrane roof
systems (in all wind zones). For adhered roof membrane application (typically,
not located in extreme wind zones), specify ASTM D4434 Type II, Grade I reinforced
roofing membrane that is particularly suitable, due to the reinforcement's dimensional
stability characteristics, for adhered PVC roof membrane system application.
Similar adhered membranes that utilize a peel and stick release paper are also acceptable.
For 20 year warranty, designers must specify a minimum 1.5 mm (0.060 inch) membrane
thickness that in all other respect complies with either ASTM D4434 Type II,
Grade I, or TYPE III or Type IV, or ASTM D6754 reinforced PVC membrane roofing
specifications and that also bears the ENERGY STAR label.
Reinforced, minimum 1.1 mm (0.045 inch) PVC roof membrane thickness is required
for ASTM D4434 Type III membrane, ASTM D4434 Type IV membrane, and similar ASTM
D6754 membranes with fleece-backing. Such PVC membranes may be used on certain
mechanically fastened installations over acceptable substrates. Thickness of
PVC membrane is measured and labeled independent of contribution by fleece backing.
Minimum 1.1 mm (0.045 inch) thickness ASTM D4434 Type II, Grade I membrane with
fleece-backing may be used in certain adhered applications where the adhesive
is typically an applied compound, spray foam adhesive, or when PVC fleecebacked
membrane roofing is to be adhered to lightweight cellular insulating concrete.
This specification shall be modified for proper adhesive and application parameters
in accordance with PVC roof membrane manufacturer's requirements and recommendations
when adhered fleeceback PVC membrane is specified.
1.8, 2.0, or 2.4 mm (0.072, 0.080, or 0.096 inch) PVC membrane is also available.
Specify 1.8, 2.0, or 2.4 mm (0.072, 0.080, or 0.096 inch) membrane for applications
that experience regular heavy traffic conditions or regular extreme wind conditions
that can experience airborne debris. 1.8, 2.0, or 2.4 mm (0.072, 0.080, or
0.096 inch) membrane may be adhered or mechanically fastened. Alternately,
a combination adhered/protected membrane system can be utilized for high wind
locations that can experience airborne debris.
Reinforced polyvinyl chloride (PVC) membrane shall contain fibers or scrim, and shall comply with ASTM D 4434
, [Type II, Grade I] [Type III] [Type IV] [Type II, Grade I or Type III or Type IV, fleece backed], or ASTM D 6754
, and in all cases shall provide [1.1] [1.5] [1.8] [2.0] [2.4] mm [0.045] [0.060] [0.072] [0.080] [0.096] inch
minimum thickness for [adhered] [mechanically fastened] [combination adhered/protected membrane] [loose-laid,
paver ballasted] [IRMA] [garden-style] application. Not withstanding the ASTM standards referenced, reinforced
PVC roof membranes provided under this section shall have the minimum, labeled thickness specified. PVC membrane
thickness specified herein is exclusive of backing material on the bottom of fleece-backed membrane. Principal
polymer used in manufacture of the membrane sheet shall be PVC. Width and length of PVC membrane roofing sheet
shall be consistent with membrane attachment methods and wind uplift requirements, and shall be as large as practical.
In order to minimize joints and 3-way overlaps, prefabricated sheets are not accepted. Maximum reinforced PVC
membrane roofing sheet dimensions to be the maximum width obtainable from PVC membrane roof manufacturer in order
to minimize seams in the field of the roof.
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. Substrate is sloped to provide positive drainage.
d. Walls and vertical surfaces are constructed to receive counterflashing, and will permit mechanical
fastening of the base flashing materials.
e. Treated wood nailers are in place on non-nailable surfaces, to permit nailing of base flashing at
minimum height of 8 inches 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.
f. 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.]
g. Avoid contact of PVC materials with fire retardant treated wood, except as approved by the PVC membrane
roof manufacturer and Contracting Officer.
NOTE: Include venting provision for wet fill substrate materials like lightweight
cellular concrete where required by cellular lightweight concrete manufacturer.
[h. Venting shall be provided if required by, and in accordance with the cellular lightweight concrete
manufacturer's requirements and recommendations.]
[i. 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.]]
[j. 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 attached as specified
in Section 07 22 00 ROOF AND DECK INSULATION. Insulation is being roofed over on the same day the insulation
is installed.]
3.2 APPLICATION METHOD
NOTE: Coordinate application method with paragraphs "Description of Roof Membrane
System" and appropriate subparagraph under "PVC Membrane Roofing".
Apply entire PVC membrane roofing utilizing [adhered] [mechanically fastened] [combination adhered/protected
membrane] [loose-laid, paver ballasted] [IRMA] [garden-style] 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 material manufacturer's
printed application instructions. Do not thin liquid materials or cleaners used for cleaning PVC 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 thermoplastic 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 PVC membrane roofing 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 PVC Roofing Membrane
Only felt-backed membrane shall be placed directly on concrete deck or other hard surface which may otherwise
damage the membrane, absent the felt backing. Non-felt-backed PVC membrane roofing sheet not be placed directly
on concrete deck or other hard surface which may damage the membrane. Membrane shall be overlapped a minimum
of 75 mm 3 inches at sides for adhered applications and 140-180 mm 5.5-7 inchesfor mechanically fastened applications
and minimum 100 mm 4 inches at ends. Where possible, direction of laps shall allow water to flow over and not
into the lap. Membrane joints shall be free of wrinkles and fishmouths. The entire length of hot-air-welded
seams shall be probe-tested and corrected during the day of installation. Defective areas shall be re-welded.
Wrinkles, fishmouths, or damaged areas shall be cut out and the area covered with membrane using a continuous
hot-air-welded seam on all sides. Repairs shall be probe-tested for continuity. Hot-air-welded seams are to
be accomplished in accordance with the PVC membrane roofing manufacturer's published requirements.
3.2.2.1 Nailing
Membrane shall be fastened to nailers in accordance with the membrane manufacturer's approved instructions.
Unless otherwise specified, nails shall be staggered on 100 mm 4 inch centers maximum; screws for sheet metal
shall be staggered on 200 mm 8 inch centers maximum; and a row of fasteners shall be at least 13 mm 1/2 inch
from edges of sheet metal.
3.2.2.2 Flashing
Roof edges, projections through the roof and changes in roof planes shall be flashed. The seam shall be sealed
a minimum of 75 mm 3 inches beyond the fasteners which attach the membrane to nailers. The installed flashing's
shall be secured at the top of the flashing a maximum of 300 mm12 inches on centers under the counterflashing
or cap. Where possible, prefabricated components shall be used for pipe seals and flashing accessories.
3.2.2.3 Expansion Joints
Expansion joints shall be covered using Prefabricated covers or elastomeric flashing in accordance with the recommendations
of the manufacturer.
3.2.2.4 Cutoffs
If work is terminated prior to weatherproofing the entire roof, the membrane shall be sealed to the roof deck.
Flutes in metal decking shall be sealed off along the cutoff edge. Membrane shall be pulled free or cut to expose
the insulation when resuming work and cut insulation sheets used for fill-in shall be removed. Asphalt or coal-tar
products shall not be used for sealing.
3.2.2.5 Walkways
Walkways shall be installed on a loose-laid pad of the membrane material extending at least.25 mm 1 inch beyond
the walkway material, and as specified by the manufacturer. Stone ballast shall not be placed below or above
walkways.
[3.2.3 Adhered Membrane Application
NOTE: Delete this paragraph unless an adhered or combination 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. When
adhesive is peel & stick release paper-activated, follow manufacturer's printed instructions. 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 adequately uniform bonding of sheet to substrate. Form field hot-air-welded laps or
seams as specified and ensure that hot-air welded dimension is at width required by the membrane manufacturer's
installation instructions. Check all seams and continuous hot-air-weld of all seams and lap seals.
][3.2.4 Mechanically Fastened Membrane Application
NOTE: Delete this paragraph unless a 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 shall 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 140 mm to 180 mm (5.5 to 7
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 the minimum recommended seam width is maintained and to ensure that 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 hot-air-welded seams and laps and/or coverstrips, as specified.
Check all seams and ensure full/continuous lap seal.
][3.2.5 Paver Ballasted Membrane Application
NOTE: Delete this paragraph unless a loose-laid, paver ballasted application
is specified.
Layout membrane and side lap adjoining sheets with the minimum seam and lap widths recommended by 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 all hot-air-welded laps and seams
as specified and at width required by the membrane manufacturer's installation instructions. Check seams to
ensure continuous seal before proceeding with further work.
][3.2.6 Combination Adhered/Protected Membrane Application
NOTE: Delete this paragraph unless a combination adhered/protected membrane
application is specified.
In sequence, apply an adhered PVC membrane roofing system and subsequently apply a protection mat/slip sheet
and with paver system on top of pedestals and install roof system components as instructed by manufacturer's
printed instructions and recommendations and specified above.
][3.2.7 Inverted Roof Membrane Assembly Application
NOTE: Delete this paragraph unless an Inverted Roof Membrane Assembly (IRMA)
application is specified.
Confirm with membrane manufacturer that substrate is suitable for membrane application. Refer to manufacturer's
printed instructions regarding suitable substrate for direct membrane application and/or apply a protection map/slip
sheet according to manufacturer's recommendations. Layout membrane and side lap adjoining sheets with the minimum
seam and lap widths recommended by 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 all hot-air-welded laps and seams as specified and at width required by the membrane manufacturer's
installation instructions. Check seams to ensure continuous seal before proceeding with further work. Apply
a protection mat/slip sheet above deck membrane and subsequently install insulation according to specification
and in accordance with manufacturer's instructions and printed literature. Apply pavers on top of insulation.
][3.2.8 Garden-Style PVC Membrane Roof System Assembly
In general, Garden-Style Membrane Roof System Assemblies are also commonly referred to as "Green " or "Vegetated"
roof systems. These roof systems are characterized by the depth of the growing media (soil or growth medium) installed
above the waterproofing/roofing system assembly. There are two categories of Garden-Style Roof systems; Extensive
Systems (light weight/less than 6" in depth of soil/growth medium), and Intensive Systems (not light weight/greater
than 150 mm 6 inch in depth of soil/growth medium). The depth of the growth medium predicates the designers options
with respect to type of plantings utilized. The type and load capacity of the underlying structure & roof deck
often dictates the designer's options with respect to the suitability of designing Intensive or Extensive Garden-Style
roofing systems. In all cases, the structural capacity of the roof/deck/building shall be determined by a structural
engineer for system suitability when designing such systems. In all instances, the waterproofing/roofing system
components are installed above the roof deck and support the subsequent application of soil/growth medium/plantings.
In addition to growth medium and plantings, both Extensive and Intensive Garden-Style PVC Membrane Roof System Assemblies
are comprised of similar system components. These components typically include; insulation, drainage layer, protection/separation
layers, filter fabric, root barrier, a thermal barrier and a reinforced PVC roofing/waterproofing membrane (Note:
certain PVC roofing/waterproofing membranes that are utilized on Garden-Style Roofs do not require root barriers
but, in all instances, the reinforced PVC roof/waterproofing membrane does not need to bear the ENERGY STAR label
due to the membrane's obscured placement in the overall system configuration). The thickness of the reinforced PVC
roof/waterproofing membrane utilized within Garden-Style Roof System Assemblies is 2 mm 80 mils minimum, and the
seaming method of the reinforced PVC membrane is as described in earlier sections of this specification under the
sections describing Inverted Roof Membrane Assembly Application and/or Paver Ballasted Membrane Application; and
shall be in accordance with the manufacturers printed instructions. In general, Extensive (light weight) Garden-Style
PVC Roof System Assemblies can be installed over both steel and structural concrete decks, whereas Intensive (not
light weight) Garden Style PVC Roof System Assemblies are limited to structural concrete deck construction. In all
cases, it is recommended that designers consult with the PVC membrane roof system manufacturer.
][3.2.9 Perimeter Attachment
NOTE: All application methods of PVC 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 456 mm (18 inches)
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 shall
be the same as the boundary required for additional perimeter mechanical fastening to meet wind resistance requirements.
][3.2.10 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 angles greater than 4 degrees (1:12). Space fasteners a maximum of 300 mm 12 inches on
center, except where more frequent attachment is required to meet specified wind resistance or where recommended
by the roof membrane manufacturer. Cover over fasteners with a layer of flashing material. Hot-air-weld all
seams of flashing material as recommended by the roof membrane manufacturer's printed data.
][3.2.11 Membrane Flashing
NOTE: Coordinate flashing requirements with Section 07 60 00 FLASHING AND SHEET
METAL and details. Ensure Section 07 60 00 is properly edited for application
to PVC roofing systems and for inclusion of flashing conditions of the project.
Include paragraphs c. and d. when roof drains are indicated.
a. 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 reinforced PVC
membrane flashing and prefabricated accessory flashing's as recommended by the roof membrane manufacturer.
b. Completely adhere flashing sheets in place. Hot-air-weld the seams of 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. Mechanically fasten top edge of base flashing with manufacturer
recommended termination bar fastened at maximum 300 mm 12 inches on center. Sheet metal counter-flashing
shall be installed 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
reinforced PVC flashing membrane 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. Metal
flashing's are specified under Section 07 60 00 FLASHING AND SHEET METAL.
c. Roof drains are specified in Section 22 00 00 PLUMBING, GENERAL PURPOSE. Flashing for roof drains,
are specified in Section 07 60 00 FLASHING AND SHEET METAL. Provide a tapered insulation sump into the
drain bowl area. Tapered slope shall not exceed 15 degrees (3:12) for fiberglass reinforced PVC membrane.
Tapered insulation shall have surface suitable for adhering membrane in the drain sump area. Avoid field
seams running through or within 600 mm 24 inches of roof drain, or as otherwise recommended by the roof
membrane manufacturer.
d. Adhere the membrane to the tapered insulation in the drain sump area. Apply PVC membrane manufacturer's
compatible sealant 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. Membrane shall be
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.
][3.2.12 Pre-fabricated Curbs
Prefabricated curbs shall be securely anchored to nailer or other base substrate and flashed with PVC membrane
flashing materials.
3.2.12.1 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.
3.2.12.2 Lightning Protection
Lightning protection system components shall be flashed or attached to the roof membrane in a manner acceptable
to the PVC membrane roof manufacturer and compliant with Code requirements.
][3.2.13 Roof Walkways
Install walkways at roof access points and where otherwise indicated for traffic areas and for access to mechanical
equipment, in accordance with the PVC membrane roof manufacturer's printed instructions.
][3.2.14 Elevated Metal [Walkways] [and] [Platforms]
Install over completed roof system in accordance with Section 05 50 13 MISCELLANEOUS METAL FABRICATIONS. Provide
for protection of roof membrane by placing reinforced membrane or walkpad material, or other material approved
by the PVC membrane roof manufacturer and Contracting Officer, at all surface bearing support locations.
][3.2.15 Isolated Paver Blocks
Install paver blocks where indicated and as necessary to support surface bearing items traversing the roof area.
Paver block shall be set on a layer of reinforced PVC membrane or walkway applied over the completed PVC roof
membrane.
][3.2.16 Paver Ballast
NOTE: Indicate the appropriate paver 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 an adhered PVC roofing system. If so, include the [Paver
] option in item "a".
Where elevated paver system is required, refer to as "Paver System" in the paragraph
title. The paver type and weight shall 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 paver application prior to applying paver system. [Install protection mat over roof membrane in
accordance with roof membrane manufacturer's recommendations. Provide minimum 75 mm 3 inch side and end laps.
Immediately after placement of protection mat,] [Install and level pedestal system in accordance with manufacturer's
requirements and] apply paver system [at the following coverage rates:
a. [Pavers: ][_____] psf for perimeter and corner areas of roof.
b. [_____] psf for field of roof.
In no case apply pavers at a coverage rate less than 10 psf or more than[_____] psf.]
][3.2.17 Correction of Deficiencies
Where any form of deficiency is found, additional measures shall be taken as deemed necessary by the Contracting
Officer to determine the extent of the deficiency and corrective actions shall be as directed by the Contracting
Officer.
]3.2.18 Clean Up
Remove debris, scraps, containers and other rubbish and trash resulting from installation of the roofing system
from job site each day.
3.3 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.
[3.3.1 Water Cutoffs
NOTE: Include this paragraph when roof insulation is a substrate for the reinforced
PVC membrane 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.
]3.3.2 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.
3.3.3 Temporary Walkways, Runways, and Platforms
Do not permit storing, walking, wheeling, and trucking directly on applied roofing system. 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.
3.4 FIELD QUALITY CONTROL
3.4.1 Construction Monitoring
During progress of the roof work, 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.
(1) Nailers and blocking are provided where and as needed.
(2) Insulation substrate is smooth, properly secured to its substrate, and without excessive
gaps prior to membrane application.
(3) The proper number, type, and spacing of fasteners are installed.
(4) Materials comply with the specified requirements.
(5) All materials are properly stored, handled and protected from moisture or other damages.
Liquid components are properly mixed prior to application.
(6) 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.]
(7) Membrane is properly overlapped.
(8) Membrane seaming is as specified by PVC membrane manufacturer. All seams are checked at
the end of each work day.
(9) Applied membrane is inspected and repaired as necessary prior to paver installation.
(10) [Membrane is adhered without ridges, wrinkles, kinks, fishmouths.]
(11) Installer adheres to specified and detailed application parameters.
(12) Associated flashing's and sheet metal are installed in a timely manner in accord with the
specified requirements.
(13) Paver ballast is within the specified weight range.
(14) Temporary protection measures are in place at the end of each work shift.
[3.4.2 Manufacturer's Inspection
NOTE: Include this paragraph when manufacturer's guarantee is required. Select
desired frequency of manufacturer inspection and coordinate with text of optional
2nd and 3rd bracketed sentences.
Manufacturer's technical representative shall [be present full time when Single Source Contract Liability Warranty
is desired] [visit the site a minimum of [[3] [_____] times] [once per week] during the installation for purposes
of reviewing materials installation practices and adequacy of work in place].[ Inspections shall occur during
the first 20 squares of membrane installation, at mid-point of the installation, and at substantial completion,
at a minimum. Additional inspections need 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 shall be performed as requested
by the Contracting Officer.] After each inspection, a report, signed by the manufacturer's technical representative
shall be submitted by the roofing Contractor to the Contracting Officer within 3 working days. The report shall
note overall quality of work, deficiencies and any other concerns, and recommended corrective action.
]3.5 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.
[3.6 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. 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.
]