Polyvinyl-Chloride (PVC) RoofingME- Building Group

SECTION 075419–POLYVINYL-CHLORIDE (PVC) ROOFING

PART 1 - GENERAL

1.1RELATED DOCUMENTSRELATED DOCUMENTS

  1. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division1 Specification Sections, apply to this Section.

1.2SUMMARY

  1. This Section includes the following:
  2. Mechanically fastened sheet roofing.
  3. Vapor retarder.
  4. Roof insulation.
  5. Walkway pads.
  6. Related Sections include the following:
  7. Division6 Section "Miscellaneous Rough Carpentry" for wood nailers and blocking; and wood-based, structural-use panels.
  8. Division7 Section "Manufactured Roof Expansion Joints."
  9. Division7 Section "Sheet Metal Flashing and Trim" for metal roof penetration flashings, flashings, and counter-flashings.
  10. Division22 Section "Storm Drainage Piping Specialties" for roof drains and sumps.

1.3DEFINITIONS

  1. Roofing Terminology: Refer to ASTMD1079 for definition of terms related to roofing work not otherwise defined in this Section.
  2. Peak Gust: The wind speed typically reported by the National Weather Service. It represents the highest wind speed sustained for 2 seconds at 30 feet above the ground.
  3. Building Edge: The building ports typically referred to as parapet or eave. Relative to contrasting color, it is the last strip of membrane before the edge metal, coping, fascia, or gutter.

1.4PERFORMANCE REQUIREMENTS

  1. General: Install sheet membrane roofing and base flashing that are watertight; will not permit the passage of liquid water; and will withstand wind loads, thermally induced movement, and exposure to weather without failure.
  2. Material Compatibility: Provide roofing materials that are compatible with one another under conditions of service and application required, as demonstrated by roofing system manufacturer based on testing and field experience.
  3. Additional Compatibility: Provide roofing materials and assemblies that are able to withstand, without observable degradation, exposures of oils (cutting and hydraulic type) and paint solvents up to the legal EPA limits.
  4. FM Listing: Provide sheet membrane, base flashings, and component materials that meet requirements of FM4450 and FM4470 as part of a roofing system and that are listed in FM "Approval Guide" for Class1 or noncombustible construction, as applicable. Identify materials with FM markings.
  5. Roofing system shall comply with the following:
  6. Fire/Windstorm Classification: Class1A-90.
  7. Wind Speed: 82 mph peak gust.
  8. Roofing System Design: Provide a single-ply roofing system that complies with roofing system manufacturer's written design instructions and with the following:
  9. SPRI "Wind Design Guide for Mechanically Fastened Roofing Systems."
  1. Energy Performance: Provide roofing system with initial Solar Reflectance Index not less than 78 when calculated according to ASTME1980, based on testing identical products by a qualified testing agency.

1.5SUBMITTALS

  1. LEED Submittals:
  2. Product Test Reports for CreditSS7.2: For roof materials, documentation indicating that roof materials comply with Solar Reflectance Index requirement.
  3. Product Data for CreditMR4: For products having recycled content, manufacturer documentation indicating percentages by weight of postconsumer and preconsumer recycled content.
  4. Include statement indicating costs for each product having recycled content.
  5. Product Data for Credit MR 5: For products and materials to comply with requirements for regional materials, provide documentation indicating location of product or material manufacturing location and the point of extraction, harvest, or recovery for each raw material.
  6. Include documentation on distance to project, contractor cost for each regional material, and percent by weight that is considered regional
  7. Product Data for CreditIEQ4.1: For adhesives and sealants used inside the weatherproofing system, documentation including printed statement of VOC content.
  8. Shop Drawings: For roofing system. Include plans, elevations, sections, details, and attachments to other work.
  9. Base flashings and membrane terminations.
  10. Tapered insulation, including slopes.
  11. Roof plan showing orientation of steel roof deck and orientation of membrane roofing and fastening spacings and patterns for mechanically fastened membrane roofing.
  12. Insulation fastening patterns for corner, perimeter, and field-of-roof locations.
  13. Samples for Verification: For the following products, in manufacturer's standard sizes:
  14. Sheet roofing, of color specified, including T-shaped side and end lap seam.
  15. Roof insulation.
  16. Walkway pads or rolls.
  17. Termination bars.
  18. Battens.
  19. Six insulation fasteners of each type, length, and finish.
  20. Six roof cover fasteners of each type, length, and finish.
  21. Installer Certificates: Signed by roofing system manufacturer certifying that Installer is approved, authorized, or licensed by manufacturer to install specified roofing system.
  22. Manufacturer Certificates: Signed by roofing manufacturer certifying that the roofing system complies with requirements specified in the "Performance Requirements" Article. Upon request, submit evidence of meeting requirements.
  23. Warranty: Sample copy of standard roofing system manufacturer's warranty stating obligations, remedies, limitations, and exclusions of warranty.
  24. Inspection Reports:
  25. Copy of roofing system manufacturer's inspection report of completed roofing installation.

1.6QUALITY ASSURANCE

  1. Installer Qualifications: A qualified firm that is approved, authorized, or licensed by membrane roofing system manufacturer to install manufacturer's product and that is eligible to receive manufacturer's special warranty.
  2. Fire-Test-Response Characteristics: Provide roofing materials with the fire-test-response characteristics indicated as determined by testing identical products per test method indicated below by UL, FM, or another testing and inspecting agency acceptable to authorities having jurisdiction. Identify materials with appropriate markings of applicable testing and inspecting agency.
  3. Exterior Fire-Test Exposure: ClassA; ASTME108, for application and slopes indicated.
  4. Fire-Resistance Ratings: ASTME119, for fire-resistance-rated roof assemblies of which roofing materials are a part.
  5. Preinstallation Conference: Before installing roofing system, conduct conference at Project site. Notify participants at least 5 working days before conference.
  6. Meet with Owner; Architect/Engineer; Owner's insurer, if applicable; testing and inspecting agency representative; roofing Installer; roofing system manufacturer's representative; deck Installer; and installers whose work interfaces with or affects roofing, including installers of roof accessories and roof-mounted equipment.
  7. Review methods and procedures related to roofing installation, including manufacturer's written instructions and fastening patterns.
  8. Examine deck substrate conditions and finishes for compliance with requirements, including flatness and fastening.
  9. Review loading limitations of deck during and after roofing.
  10. Review flashings, special roofing details, roof drainage, roof penetrations, equipment curbs, and condition of other construction that will affect roofing.
  11. Review governing regulations and requirements for insurance, certificates, and inspection and testing, if applicable.
  12. Review temporary protection requirements for roofing system during and after installation.
  13. Review roof observation and repair procedures after roofing installation.
  14. Document proceedings, including corrective measures or actions required, and furnish copy of record to each participant.
  15. Location of roofing system installation shall be coordinated with other construction trade requirements and/or plant production requirements.

1.7DELIVERY, STORAGE, AND HANDLING

  1. Deliver roofing materials to Project site in original containers with seals unbroken and labeled with manufacturer's name, product brand name and type, date of manufacture, and directions for storing and mixing with other components.
  2. Store membrane in a clean, dry, protected location and within the temperature range required by roofing system manufacturer. Do not stand rolls on end; lay flat.
  3. Store liquid materials in their original undamaged containers in a clean, dry, protected location and within the temperature range required by roofing system manufacturer. Protect stored liquid materials from direct sunlight.
  4. Discard and legally dispose of liquid material that cannot be applied within its stated shelf life.
  5. Protect roof insulation materials from physical damage and from deterioration by sunlight, moisture, soiling, and other sources. Store in a dry location. Comply with insulation manufacturer's written instructions for handling, storing, and protecting during installation.
  6. Handle and store roofing materials and place equipment in a manner to avoid permanent deflection of deck.
  7. Installer shall provide temporary protection adequate to protect Owner’s personnel, production activity, material, and services (as approved by Owner).
  8. Construction activity, staging, and material storage shall not interfere with production activity (including odors, disruptive overhead activity, and other disturbances).

1.8PROJECT CONDITIONS

  1. Weather Limitations: Proceed with roofing work only when existing and forecasted weather conditions permit roofing to be installed according to manufacturers' written instructions and warranty requirements.

1.9WARRANTY

  1. General Warranty: The warranties specified in this Article shall not deprive the Owner of other rights the Owner may have under other provisions of the Contract Documents and shall be in addition to, and run concurrent with, other warranties made by the Contractor under requirements of the Contract Documents.
  2. Roofing Manufacturer's Total System Warranty: Submit a written warranty in a form acceptable to the Owner, without monetary limitation, signed by roofing system manufacturer agreeing to promptly repair leaks resulting from defects in materials or workmanship for a warranty period of 15 years. System warranted shall include membrane, membrane flashing, metal flashing, fascia, insulation, fasteners, expansion joint material, and accessories to provide a watertight installation.
  3. Include a warranty of merchantability for the roofing system.
  4. Include a letter of acceptance for materials and assemblies to be used in the roofing system.
  5. Include the specified wind speed.
  6. In support of manufacturer’s warranty, manufacturer shall provide annual inspections in May or June during the term of the warranty and submit a yearly report to plant manager listing maintenance and repair items required to maintain warranty.
  7. Special Project Warranty: Submit roofing Installer’s warranty in a form acceptable to the Owner, signed by Installer, covering work of this section, including membrane roofing, sheet flashing, roof insulation, fasteners, and other accessories for a warranty period of two years from date of Substantial Completion. Installer shall certify that all materials have been installed in conformance with roofing system manufacturer’s recommendations, details, specifications, and warranty requirements.

PART 2 - PRODUCTS

2.1MANUFACTURERS

  1. Manufacturers: Unless otherwise directed by the Owner, provide products by one of the following:
  2. PVC Sheet Roofing
  3. Johns Manville SP6RM.
  4. Sarnafil Roofing Systems S327 Energy Smart.
  5. Firestone Building Products Company.
  6. GenFlex Roofing Systems.
  7. Polyisocyanurate Board Insulation: As manufactured, distributed or approved by the membrane manufacturer.

2.2PVC SHEET

  1. PVC Sheet: Uniform, flexible sheet formed from polyvinyl chloride with plasticizers and modifiers, complying with ASTMD4434, of the following type, grade, thickness, and exposed face color:
  2. Type: TypeIII, polyester fabric-reinforced sheet.
  3. Thickness: 60 mils minimum.
  4. Manufacturer to guarantee the membrane thickness meets or exceeds the specified thickness when tested according to ASTM D-751.
  5. Polymer thickness above scrim to be a minimum of 30 mils.
  6. Exposed Face Color: Manufacturer’s standard white for field; color as selected by the Owner for perimeter sheets.
  7. Exposed Edge Flashing Face Color: Color contrasting with “Exposed Face Color.”
  8. Sheet Width: 120 inches maximum.

2.3AUXILIARY MATERIALS

  1. General: Furnish auxiliary materials recommended by roofing system manufacturer for intended use and compatible with membrane roofing material.
  2. Furnish liquid-type auxiliary materials that meet VOC limits of authorities having jurisdiction.

Retain first subparagraph below if required for LEED-NC or LEED-CSCreditIEQ4.1.

  1. Adhesives and sealants that are not on the exterior side of weather barrier shall comply with the following limits for VOC content when calculated according to 40CFR59, SubpartD (EPA Method24):
  2. Plastic Foam Adhesives: 50 g/L.
  3. Gypsum Board and Panel Adhesives: 50 g/L.
  4. Multipurpose Construction Adhesives: 70 g/L.
  5. Fiberglass Adhesives: 80 g/L.
  6. Single-Ply Roof Membrane Adhesives: 250 g/L.
  7. Other Adhesives: 250 g/L.
  8. PVC Welding Compounds: 510 g/L.
  9. Adhesive Primer for Plastic: 650 g/L
  10. Single-Ply Roof Membrane Sealants: 450 g/L.
  11. Nonmembrane Roof Sealants: 300 g/L.
  12. Sealant Primers for Nonporous Substrates: 250 g/L.
  13. Sealant Primers for Porous Substrates: 775 g/L.
  1. Sheet Flashing: Manufacturer's standard sheet flashing of same material, type, thickness, and color as designated for “Exposed Edge Flashing Face Color” in article on PVC sheet.
  2. Sheet Flashing at Building Edges: Manufacturer's standard sheet flashing of same material, type, thickness, and color contrasting with sheet membrane. Refer to Article “PVC Sheet.”
  3. Add manufacturer’s standard 0.028 inch minimum galvanized metal flashing with minimum 40 mil PVC coating where required to meet warranty and performance requirements.
  4. Bonding Adhesive: Manufacturer's standard bonding adhesive.
  5. Metal Termination Bars: Manufacturer's standard aluminum bars, approximately 1inch wide, formed and prepunched.
  6. Fasteners: Factory-coated steel fasteners and metal or plastic plates meeting corrosion-resistance provisions of FM4470, designed for fastening sheet to substrate, and acceptable to roofing system manufacturer.
  7. Miscellaneous Accessories: Provide pourable sealers, preformed cone and vent sheet flashings, preformed inside and outside corner sheet flashings, T-joint covers, seam calk, termination reglets, and other accessories recommended by roofing system manufacturer for intended use.

2.4SUBSTRATE BOARDS

  1. Substrate Board: ASTMC1177/C1177M, glass-mat, water-resistant gypsum substrate, TypeX, 5/8 inch (16 mm) thick.
  2. Products: Subject to compliance with requirements, available products that may be incorporated into the Work include, but are not limited to, the following:
  3. Georgia-Pacific Corporation; Dens Deck.
  1. Fasteners: Factory-coated steel fasteners and metal or plastic plates complying with corrosion-resistance provisions in FM Approvals4470, designed for fastening substrate panel to roof deck.

2.5VAPOR RETARDER

  1. Polyethylene Film: ASTMD4397, 6 mils (0.15 mm) thick, minimum, with maximum permeance rating of 0.13 perm (7.5 ng/Pa x s x sq.m).
  2. Tape: Pressure-sensitive tape of type recommended by vapor-retarder manufacturer for sealing joints and penetrations in vapor retarder.
  3. Adhesive: Manufacturer's standard lap adhesive, FM Approvals approved for vapor-retarder application.

2.6INSULATION MATERIALS

  1. General: Provide preformed roof insulation boards that comply with requirements, selected from manufacturer's standard sizes and of thicknesses indicated.
  2. Provide preformed saddles, crickets, tapered edge strips, and other insulation shapes where indicated for sloping to drain. Fabricate to slopes indicated.
  3. Saddles shall be provided with slope at twice the rate of slope of roof in the opposite direction.
  4. Provide preformed, tapered insulation boards at roof drain, sloping to drain.
  5. Fabricate with taper of 1/2 inch per 12 inches.
  6. Nominal insulation thickness:
  7. 3.5 inches minimum, not including cap board and base board thicknesses.
  8. Two layers of insulation to make up the total thickness (no individual layer greater than 2 inches).
  9. Insulation R-Value: R=20.3 (LTTR) minimum.
  1. Polyisocyanurate Board Insulation: ASTMC1289, classified by facer TypeII, felt or glass-fiber mat on both major surfaces.
  2. Compressive Strength (ASTMD1621, 1 inch thick): 25 psi minimum.
  3. Density (ASTMD1622): 1.5 pcf minimum.

2.7INSULATION ACCESSORIES

  1. General: Furnish roof insulation accessories recommended by insulation manufacturer for intended use and compatible with sheet roofing material.
  1. Fasteners: Factory-coated steel fasteners and metal or plastic plates meeting corrosion-resistance provisions of FM4470, designed for fastening roof insulation to substrate, and acceptable to roofing system manufacturer.
  2. Protection Mat: Woven or nonwoven polypropylene, polyolefin, or polyester fabric, water permeable and resistant to UV degradation, type and weight as recommended by roofing system manufacturer for application.

2.8WALKWAYS

  1. Walkway Pads: Factory-formed, nonporous, heavy-duty, slip-resisting, surface-embossed walkway approximately 100 mil thick, weldable membrane, of materials acceptable to roofing system manufacturer.
  2. Walkway color shall be as selected by Owner and shall different than roofing membrane color.
  1. “Landing” Reinforcement: Water-resistant-core gypsum sheathing board complying with ASTM C79 with long edges surfaced with water-repellent paper and square edges. 1/4 inch, unless otherwise directed by the Owner
  2. Products
  3. G-P Gypsum Corporation; Dens-Deck.
  4. Owens Corning; StrataGuard Roof Board.

PART 3 - EXECUTION

3.1EXAMINATION

  1. Examine substrates, areas, and conditions under which roofing will be applied, with Installer present, for compliance with requirements.
  1. Verify that roof openings and penetrations are in place and set and braced and that roof drains are properly clamped into position.
  2. Verify that wood nailers are in place and secured and match thicknesses of insulation required.
  3. Do not proceed with installation until unsatisfactory conditions have been corrected.

3.2PREPARATION

  1. Clean substrate, including steel deck flutes, of dust, debris, and other substances detrimental to roofing installation according to roofing system manufacturer's written instructions. Remove sharp projections.
  2. Remove water accumulations in steel deck flutes.
  3. During cold weather installations, remove snow from the substrate, including flutes of steel deck.
  1. Prevent materials from entering and clogging roof drains and conductors and from spilling or migrating onto surfaces of other construction. Remove roof-drain plugs when no work is taking place or when rain is forecast.
  2. Complete terminations and base flashings and provide temporary seals to prevent water from entering completed sections of the roofing system at the end of the workday or when rain is forecast. Remove and discard temporary seals before beginning work on adjoining roofing.

3.3SUBSTRATE BOARD

  1. Install substrate board with long joints in continuous straight lines, perpendicular to roof slopes with end joints staggered between rows. Tightly butt substrate boards together.
  2. Fasten substrate board to top flanges of steel deck according to recommendations in FM Approvals' "RoofNav" and FM Global Loss Prevention Data Sheet1-29 for specified Windstorm Resistance Classification.

3.4VAPOR-RETARDER INSTALLATION

  1. Polyethylene Film: Loosely lay polyethylene-film vapor retarder in a single layer over area to receive vapor retarder, side and end lapping each sheet a minimum of 2 inches (50 mm) and 6 inches (150 mm), respectively.
  2. Continuously seal side and end laps with tape.
  1. Completely seal vapor retarder at terminations, obstructions, and penetrations to prevent air movement into membrane roofing system.

3.5INSULATION INSTALLATION