1-4 SPECS 09900 .doc

IDC Base Roof Repair

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 April 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 7-05

(2006; Errata 2007) Minimum Design Loads for Buildings and Other Structures

ASTM INTERNATIONAL (ASTM)

ASTM D 4434/D 4434M

(2009) Poly(Vinyl Chloride) Sheet Roofing

ASTM D 6754

(2002) Standard Specification for Ketone Ethylene Ester Based Sheet Roofing

ASTM E 108

(2007a) Fire Tests of Roof Coverings

FM GLOBAL (FM)

FM 4470

(1986; R 1992) Class I Roof Covers

FM 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 Coverings

UL RMSD

(2009) 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.

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 7-05 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 1-90 in accordance with FM RoofNav (www. roofnav.com) or FM P7825 and capable of withstanding an uplift pressure of 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 85 mph in accordance with ASCE 7-05 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 information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government.

SD-02 Shop Drawings Detail Drawings 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; G

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 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 Engineering calculations validating the wind resistance of roof system.

SD-07 Certificates Qualification of ENERGY STAR-labeled PVC Certificate from PVC membrane roofing manufacturer certifying that the roof membrane, meets specified requirements.

Qualifications of Applicator; G Certificate stating that the applicator meets requirements specified.

Wind Uplift Resistance; G Fire Resistance; G Roof system assembly wind uplift and fire rating classification listings.

Minimum Polymer Thickness; G Certification from PVC membrane manufacturer that the proposed PVC membrane roofing product meets the minimum polymer thickness specified.

warranty; 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 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 Perimeter Attachment Auxiliary Fasteners 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 3 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 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, insulation], flashing and sheet metal 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 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 for 20 years. 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 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.

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 0.032 inch thick aluminum card for exterior display. Card shall be 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) 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 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 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 concrete roof pavers [with drainage channels on the underside], and as recommended by the PVC roof membrane manufacturer. Pavers shall be minimum 3000 psi compressive strength, weigh not less than[12 psf, not less than 1-1/4 inches thick and nominal 24 inches in length and width and without sharp edges and projections. Elevate pavers above the roof membrane surface with paver manufacturer's recommended 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 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 G90 galvanized with minimum 4 inch flange for attachment to roof nailers. Curbs shall provide minimum height of 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 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 18 by 18 , without sharp edges and projections, and weighing no more than 45 80 pounds each.

2.1.9 Elevated Metal Walkways and Platforms

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.

2.1.11 NOT USED

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.

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/D 4434M, 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 0.060 inch minimum thickness. 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. 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 have been replaced. There are no cracks or end joints 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 1/4 inch in width. 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 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 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 3 inches at sides for adhered applications and 5.5-7 inches for mechanically fastened applications and minimum 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 4 inch centers maximum; screws for sheet metal shall be staggered on 8 inch centers maximum; and a row of fasteners shall be at least 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 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 of12 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 1 inch beyond the walkway material,…