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HomeMy WebLinkAbout07-5419-Polyvinyl-Chloride-(PVC)-Roofing-(Part-of-FSB-07-0002)_Rev_2Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 1 SECTION 07 5419 POLYVINYL-CHLORIDE (PVC) ROOFING (Part of Filed Sub-Bid Section 07 0002 - Roofing And Flashing) PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Work Included: Provide labor, materials and equipment necessary to complete the work of this Section, including but not limited to the following: 1. Adhered polyvinyl chloride (PVC) roofing system. 2. Substrate board. 3. Vapor retarder. 4. Roof insulation. 5. Cover board. 6. Walkways. 7. Other items indicated on Drawings as Work of this Section. B. Section includes installation of sound-absorbing insulation strips in ribs of roof deck. Sound- absorbing insulation strips are furnished under Section 05 3100 "Steel Decking." C. Related Requirements: 1. Section 01 3113.23 “Air Barrier System Coordination” for administrative and procedural requirements for coordination between the trades, and for the proper scheduling and sequencing of the work to produce an airtight building enclosure. 2. Section 01 8113.23 “Sustainable Design Requirements” for general requirements and procedures for compliance with certain USGBC LEED prerequisites and credits. 3. Section 01 9113 “General Commissioning Requirements." 4. Section 01 9119 “Facility Shell Commissioning" for commissioning process requirements for building envelope. 5. Section 03 3000 “Cast-In-Place Concrete” for concrete roof decks. 6. Section 05 3100 “Steel Decking” for steel roof decking. 7. Section 06 1000 "Rough Carpentry" for wood nailers, curbs, and blocking. 8. Section 07 2100 "Thermal Insulation" for insulation beneath the roof deck. 9. Section 07 6200 "Sheet Metal Flashing and Trim" for metal roof flashings and counterflashings. 10. Section 07 7100 "Roof Specialties" for manufactured copings and roof-edge specialties. 11. Section 07 7129 "Manufactured Roof Expansion Joints" for premanufactured roof expansion-joint assemblies. 12. Section 07 7200 “Roof Accessories" for hatch-type heat and smoke vents, elevator penthouse ventilators with operable dampers, and roof drain markers. 13. Section 07 9200 "Joint Sealants" for joint sealants, joint fillers, and joint preparation. 14. Division 22 Sections "Plumbing" for roof drains. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 2 1.3 DEFINITIONS A. Roofing Terminology: Definitions in ASTM D1079 and glossary in NRCA's "The NRCA Roofing Manual: Membrane Roof Systems" apply to work of this Section. 1.4 PREINSTALLATION MEETINGS A. Preinstallation Roofing Conference: Conduct conference at Project site. 1. Meet with Owner, Architect, Owner's insurer if applicable, testing and inspecting agency representative, roofing Installer, roofing system manufacturer's representative, deck Installer, air barrier Installer, and installers whose work interfaces with or affects roofing, including installers of roof accessories and roof-mounted equipment. 2. Review methods and procedures related to roofing installation, including manufacturer's written instructions. 3. Review and finalize construction schedule, and verify availability of materials, Installer's personnel, equipment, and facilities needed to make progress and avoid delays. 4. Examine deck substrate conditions and finishes for compliance with requirements, including flatness and fastening. 5. Review structural loading limitations of roof deck during and after roofing. 6. Review base flashings, special roofing details, roof drainage, roof penetrations, equipment curbs, and condition of other construction that affects roofing system. 7. Review governing regulations and requirements for insurance and certificates if applicable. 8. Review temporary protection requirements for roofing system during and after installation. 9. Review roof observation and repair procedures after roofing installation. 1.5 ACTION SUBMITTALS A. Make Submittals in accordance with Section 01 3300 “Submittal Procedures.” B. Product Data: For each type of product. 1. For insulation and roof system component fasteners, include copy of FM Approvals' RoofNav listing. C. Sustainable Design Submittals: 1. Environmental Product Declaration (EPD): Provide manufacturers’ product documentation for each product having an Environmental Product Declaration (EPD). a. Documentation should confirm EPD conforms with ISO 14205 EN 15804 or ISO 21930. b. EPD shall have at least Cradle to Gate scope. c. Complete "LEED Materials Documentation Sheet" with MRc2 information for each product having an EPD. 2. Recycled Content: Provide manufacturers’ product documentation that includes recycled content claims for the products contributing towards compliance. Claims must conform to the definition in ISO 14021-1999, Environmental Labels and Declarations, Self-Declared Environmental Claims. a. Complete "LEED Materials Documentation Sheet" with MRc3 Option 2 information for products with recycled content installed in the building. D. Shop Drawings: Include roof plans, sections, details, and attachments to other work, including the following: Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 3 1. Layout and thickness of insulation. 2. Base flashings and membrane terminations. 3. Flashing details at penetrations. 4. Tapered insulation thickness and slopes. 5. Roof plan showing orientation of steel roof deck and orientation of roof membrane, fastening spacings, and patterns for mechanically fastened roofing system. 6. Insulation fastening patterns for corner, perimeter, and field-of-roof locations. 7. Tie-in with air barrier. E. Samples for Verification: For the following products: 1. Roof membrane and flashing, of color required. 2. Walkway pads or rolls, of color required. F. Wind Uplift Resistance Submittal: For roofing system, indicating compliance with wind uplift performance requirements. 1.6 INFORMATIONAL SUBMITTALS A. Qualification Data: For Installer and manufacturer. B. Manufacturer Certificates: 1. Performance Requirement Certificate: Signed by roof membrane manufacturer, certifying that roofing system complies with requirements specified in "Performance Requirements" Article. a. Submit evidence of compliance with performance requirements. 2. Special Warranty Certificate: Signed by roof membrane manufacturer, certifying that all materials supplied under this Section are acceptable for special warranty. C. Product Test Reports: For roof membrane and insulation, tests performed by independent qualified testing agency indicating compliance with specified requirements. D. Evaluation Reports: For components of roofing system, from ICC-ES. E. Field quality-control reports. F. Sample Warranties: For manufacturer's special warranties. 1.7 CLOSEOUT SUBMITTALS A. Maintenance Data: For roofing system to include in maintenance manuals. 1.8 QUALITY ASSURANCE A. Manufacturer Qualifications: A qualified manufacturer that is listed in FM Approvals' RoofNav for roofing system identical to that used for this Project. B. Installer Qualifications: A qualified firm that is approved, authorized, or licensed by roofing system manufacturer to install manufacturer's product and that is eligible to receive manufacturer's special warranty. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 4 1.9 DELIVERY, STORAGE, AND HANDLING A. 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, approval or listing agency markings, and directions for storing and mixing with other components. B. 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 material from direct sunlight. 1. Discard and legally dispose of liquid material that cannot be applied within its stated shelf life. C. 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. D. Handle and store roofing materials, and place equipment in a manner to avoid permanent deflection of deck. 1.10 FIELD CONDITIONS A. Weather Limitations: Proceed with installation only when existing and forecasted weather conditions permit roofing system to be installed according to manufacturer's written instructions and warranty requirements. 1.11 WARRANTY A. Special Warranty: Manufacturer agrees to repair or replace components of roofing system that fail in materials or workmanship within specified warranty period. 1. Special warranty includes roof membrane, base flashings, roof insulation, fasteners, cover boards, substrate board, roof pavers, and other components of roofing system. 2. Wind-Speed Warranty: Special warranty includes resistance to blow-off or damage caused by wind speeds up to 120 mph measured at 10 meters above grade. 3. Warranty Period: 15 years from date of Substantial Completion. B. Special Project Warranty: Submit roofing Installer's warranty, on warranty form at end of this Section, signed by Installer, covering the Work of this Section, including all components of roofing system such as roof membrane, base flashing, roof insulation, fasteners, cover boards, substrate boards, vapor retarders, roof pavers, and walkway products, for the following warranty period: 1. Warranty Period: Two years from date of Substantial Completion. PART 2 - PRODUCTS 2.1 LEED REQUIREMENTS A. Environmental Product Declaration (EPD): Provide products with Third Party Environmental Product Declaration (EPD) whenever available. B. Recycled Content: Provide products with the maximum recycled content possible. Minimum recycled content 20 percent. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 5 2.2 PERFORMANCE REQUIREMENTS A. General Performance: Installed roofing and base flashings shall withstand specified uplift pressures, thermally induced movement, and exposure to weather without failure due to defective manufacture, fabrication, installation, or other defects in construction. Roof system and flashings shall remain watertight. 1. Accelerated Weathering: Roof membrane shall withstand 2000 hours of exposure when tested according to ASTM G152, ASTM G154, or ASTM G155. 2. Impact Resistance: Roof membrane shall resist impact damage when tested according to ASTM D3746, ASTM D4272/D4272M, or the "Resistance to Foot Traffic Test" in FM Approvals 4470. B. Material Compatibility: Roofing materials shall be compatible with one another and adjacent materials under conditions of service and application required, as demonstrated by roof membrane manufacturer based on testing and field experience. C. Wind Uplift Resistance: Design roofing system to resist the following wind uplift pressures when tested according to FM Approvals 4474, UL 580, or UL 1897: 1. Ultimate Design Wind Speed, Vult (780 CMR: State Board of Building Regulations And Standards): 152 mph. 2. Surface Roughness Exposure: Exposure Category C. 3. Mean Roof Height: 35 ft. D. FM Approvals' RoofNav Listing: Roof membrane, base flashings, and component materials shall comply with requirements in FM Approvals 4450 or FM Approvals 4470 as part of a roofing system, and shall be listed in FM Approvals' RoofNav for Class 1 or noncombustible construction, as applicable. Identify materials with FM Approvals Certification markings. 1. Fire/Windstorm Classification: Class 1A-150. 2. Hail-Resistance Rating: FM Global Property Loss Prevention Data Sheet 1-34 MH. E. Solar Reflectance Index: Not less than 78 when calculated according to ASTM E 1980, based on testing identical products by a qualified testing agency. F. Exterior Fire-Test Exposure: ASTM E108 or UL 790, Class A; for application and roof slopes indicated; testing by a qualified testing agency. Identify products with appropriate markings of applicable testing agency. G. Fire-Resistance Ratings: Comply with fire-resistance-rated assembly designs indicated. Identify products with appropriate markings of applicable testing agency. 2.3 POLYVINYL CHLORIDE (PVC) ROOFING A. PVC Sheet: ASTM D4434/D4434M, Type II, glass-fiber reinforced, felt backed. 1. Basis-of-Design Product: Subject to compliance with requirements, provide Sarnafil G410 by Sika Sarnafil or a comparable product by one of the following or equal: a. Carlisle SynTec Incorporated. b. Duro-Last Roofing, Inc. c. Versico Roofing Systems. 2. Thickness: Minimum 72 mils. a. Provide 80 mils where tray-type vegetated roof assemblies are indicated. 3. Exposed Face Color: White. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 6 B. Source Limitations: Obtain components for roofing system from roof membrane manufacturer or manufacturers approved by roof membrane manufacturer. 2.4 AUXILIARY ROOFING MATERIALS A. General: Auxiliary materials recommended by roofing system manufacturer for intended use and compatible with other roofing components. B. Sheet Flashing: Manufacturer's standard sheet flashing of same material, type, reinforcement, thickness, and color as PVC sheet. C. Prefabricated Pipe Flashings: As recommended by roof membrane manufacturer. D. Water-Based, Fabric-Backed Membrane Adhesive: Roofing system manufacturer's standard water-based, cold-applied adhesive formulated for compatibility and use with fabric-backed membrane roofing. E. Metal Termination Bars: Manufacturer's standard, predrilled stainless steel or aluminum bars, approximately 1 by 1/8 inch thick; with anchors. F. Fasteners: Factory-coated steel fasteners and metal or plastic plates complying with corrosion- resistance provisions in FM Approvals 4470, designed for fastening roofing components to substrate, and acceptable to roofing system manufacturer. G. Miscellaneous Accessories: Provide pourable sealers, preformed cone and vent sheet flashings, preformed inside and outside corner sheet flashings, T-joint covers, lap sealants, termination reglets, and other accessories. 2.5 SUBSTRATE BOARDS A. Substrate Board: ASTM C1177/C1177M, glass-mat, water-resistant gypsum substrate or ASTM C1278/C1278M, fiber-reinforced gypsum board. 1. Products: Subject to compliance with requirements, products that may be incorporated into the Work include, but are not limited to the following or equal: a. CertainTeed Corporation; GlasRoc Sheathing Type X. b. Georgia-Pacific Corporation; Dens Deck DuraGuard. c. National Gypsum Company; Gold Bond eXP Extended Exposure Sheathing. d. Temple-Inland, Inc; GreenGlass Exterior Sheathing. e. USG Corporation; Securock Glass Mat Roof Board. 2. Thickness: Type X, 5/8 inch. 3. Surface Finish: Factory primed. B. Fasteners: Factory-coated steel fasteners and metal or plastic plates complying with corrosion- resistance provisions in FM Approvals 4470, designed for fastening substrate board to roof deck. 2.6 VAPOR RETARDER A. Provide one of the following: 1. Self-Adhering-Sheet Vapor Retarder: ASTM D1970/D1970M, polyethylene film laminated to layer of rubberized asphalt adhesive, minimum 40-mil- total thickness; Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 7 maximum permeance rating of 0.1 perm; cold applied, with slip-resisting surface and release paper backing. Provide primer when recommended by vapor retarder manufacturer. A.2. Self-Adhering-Sheet Vapor Retarder: Polyethylene film laminated to layer of butyl rubber adhesive, minimum 30-mil- total thickness; maximum permeance rating of 0.1 perm; cold applied, with slip-resisting surface and release paper backing. Provide primer when recommended by vapor retarder manufacturer. 2.7 ROOF INSULATION A. General: Preformed roof insulation boards manufactured or approved by PVC roof membrane manufacturer, approved for use in FM Approvals' RoofNav listed roof assemblies. B. Polyisocyanurate Board Insulation: ASTM C1289, Type II, Class 2, Grade 2, felt or glass-fiber mat facer on both major surfaces. 1. Compressive Strength: 20 psi. 2. Size: 48 by 48 inches. 3. Thickness: a. Base Layer: 1-1/2 inches. b. Upper Layer: 8-1/2 inches. C. Tapered Insulation: Provide factory-tapered insulation boards. 1. Material: Match roof insulation. 2. Minimum Thickness: 1/4 inch. 3. Slope: a. Roof Field: 1/4 inch per foot unless otherwise indicated on Drawings. b. Saddles and Crickets: 1/2 inch per foot unless otherwise indicated on Drawings. 2.8 INSULATION ACCESSORIES A. General: Roof insulation accessories recommended by insulation manufacturer for intended use and compatibility with other roofing system components. B. Fasteners: Factory-coated steel fasteners and metal or plastic plates complying with corrosion- resistance provisions in FM Approvals 4470, designed for fastening roof insulation to substrate, and acceptable to roofing system manufacturer. C. Insulation Adhesive: Insulation manufacturer's recommended adhesive formulated to attach roof insulation to substrate or to another insulation layer as follows: 1. Bead-applied, low-rise, one-component or multicomponent urethane adhesive. 1. Adhesives and sealants shall comply with the following limits for VOC content: a. Plastic Foam Adhesives: 50 g/L. b. Gypsum Board and Panel Adhesives: 50 g/L. c. Other Adhesives: 250 g/L. D. Cover Board: ASTM C1177/C1177M, glass-mat, water-resistant gypsum board or ASTM C1278/C1278M fiber-reinforced gypsum board. 1. Products: Subject to compliance with requirements, products that may be incorporated into the Work include, but are not limited to the following or equal: a. CertainTeed Corporation; GlasRoc Sheathing. b. Georgia-Pacific Corporation; Dens Deck Prime. c. National Gypsum Company; Gold Bond eXP Extended Exposure Sheathing. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 8 d. Temple-Inland, Inc.; GreenGlass Exterior Sheathing. e. USG Corporation; Securock Glass Mat Roof Board. 2. Thickness: 5/8 inch. 3. Surface Finish: Factory primed. E. Roof Expansion Joints: Provide foam type roof expansion joints or sponge tubing per the roof membrane manufacturers standard detailing recommendations. 2.9 WALKWAYS A. Flexible Walkways: Polyester reinforced weldable membrane, slip-resisting, surface-textured walkway pads, approximately 0.096 inch thick and acceptable to roof membrane manufacturer. 1. Color: White. PART 3 - EXECUTION 3.1 EXAMINATION A. Examine substrates, areas, and conditions, with Installer present, for compliance with requirements and other conditions affecting performance of the Work. 1. Verify that roof openings and penetrations are in place, curbs are set and braced, and roof-drain bodies are securely clamped in place. 2. Verify that wood blocking, curbs, and nailers are securely anchored to roof deck at penetrations and terminations and that nailers match thicknesses of insulation. 3. Verify that surface plane flatness and fastening of steel roof deck complies with requirements in Section 05 3100 "Steel Decking." 4. Verify that minimum concrete drying period recommended by roofing system manufacturer has passed. 5. Verify that concrete substrate is visibly dry and free of moisture, and that minimum concrete internal relative humidity is not more than 75 percent, or as recommended by roofing system manufacturer, when tested according to ASTM F2170. a. Test Frequency: One test probe per each 1000 sq. ft. of roof deck, with no fewer than three test probes. b. Submit test reports within 24 hours of performing tests. 6. Verify that concrete-curing compounds that will impair adhesion of roofing components to roof deck have been removed. B. Proceed with installation only after unsatisfactory conditions have been corrected. 3.2 PREPARATION A. Clean substrate of dust, debris, moisture, and other substances detrimental to roofing system installation according to roofing system manufacturer's written instructions. Remove sharp projections. B. 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. C. Install sound-absorbing insulation strips according to acoustical roof deck manufacturer's written instructions. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 9 3.3 INSTALLATION OF ROOFING, GENERAL A. Install roofing system according to roofing system manufacturer's written instructions, FM Approvals' RoofNav listed roof assembly requirements, and FM Global Property Loss Prevention Data Sheet 1-29. B. Complete terminations and base flashings and provide temporary seals to prevent water from entering completed sections of roofing system at end of workday or when rain is forecast. Remove and discard temporary seals before beginning work on adjoining roofing. C. Coordinate installation and transition of roofing system component serving as an air barrier with air barrier specified under Section 07 2715 "Nonbituminous Self-Adhering Sheet Air Barriers" and Section 07 2726 "Fluid-Applied Membrane Air Barriers." 3.4 INSTALLATION OF SUBSTRATE BOARD AT STEEL ROOF DECKS A. Install substrate board with long joints in continuous straight lines, with end joints staggered not less than 24 inchesin adjacent rows. 1. At steel roof decks, install substrate board at right angle to flutes of deck. a. Locate end joints over crests of steel roof deck. 2. Tightly butt substrate boards together. 3. Cut substrate board to fit tight around penetrations and projections, and to fit tight to intersecting sloping roof decks. 4. Fasten substrate board to top flanges of steel deck according to recommendations in FM Approvals' RoofNav listed roof assembly requirements for specified Windstorm Resistance Classification and FM Global Property Loss Prevention Data Sheet 1-29. 3.5 INSTALLATION OF VAPOR RETARDER A. Self-Adhering-Sheet Vapor Retarder: Prime substrate if required by manufacturer. Install self- adhering-sheet vapor retarder over area to receive vapor retarder, side and end lapping each sheet a minimum of 3-1/2 and 6 inches, respectively. 1. Extend vertically up parapet walls and projections to a minimum height equal to height of insulation and cover board. 2. Seal laps by rolling. B. Completely seal vapor retarder at terminations, obstructions, and penetrations to prevent air movement into roofing system. 3.6 INSTALLATION OF INSULATION A. Coordinate installing roofing system components so insulation is not exposed to precipitation or left exposed at end of workday. B. Comply with roofing system and insulation manufacturer's written instructions for installing roof insulation. C. Installation Over Metal Decking: 1. Install base layer of insulation with joints staggered not less than 24 inches in adjacent rows. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 10 a. Trim insulation neatly to fit around penetrations and projections, and to fit tight to intersecting sloping roof decks. b. Make joints between adjacent insulation boards not more than 1/4 inch in width. c. At internal roof drains, slope insulation to create a square drain sump with each side equal to the diameter of the drain bowl plus 24 inches. 1) Trim insulation so that water flow is unrestricted. d. Fill gaps exceeding 1/4 inch with insulation. e. Cut and fit insulation within 1/4 inch of nailers, projections, and penetrations. f. Mechanically attach base layer of insulation and substrate board using mechanical fasteners specifically designed and sized for fastening specified board-type roof insulation to metal decks. 1) Fasten insulation according to requirements in FM Approvals' RoofNav for specified Windstorm Resistance Classification. 2. Install upper layers of insulation and tapered insulation with joints of each layer offset not less than 12 inches from previous layer of insulation. a. Staggered end joints within each layer not less than 24 inches in adjacent rows. b. Trim insulation neatly to fit around penetrations and projections, and to fit tight to intersecting sloping roof decks. c. Make joints between adjacent insulation boards not more than 1/4 inch in width. d. At internal roof drains, slope insulation to create a square drain sump with each side equal to the diameter of the drain bowl plus 24 inches. 1) Trim insulation so that water flow is unrestricted. 2) At internal roof drains, provide a minimum of 7 inches of insualtion. e. Fill gaps exceeding 1/4 inch with insulation. f. Cut and fit insulation within 1/4 inch of nailers, projections, and penetrations. g. Mechanically attach insulation and cover board using mechanical fasteners specifically designed and sized for fastening specified board-type roof insulation to metal decks. g. Adhere each layer of insulation to substrate using adhesive according to FM Approvals' RoofNav listed roof assembly requirements for specified Windstorm Resistance Classification and FM Global Property Loss Prevention Data Sheet 1- 29, as follows: 1) Set each layer of insulation in ribbons of bead-applied insulation adhesive, firmly pressing and maintaining insulation in place. D. Installation Over Concrete Decks: 1. Install base layer of insulation with joints staggered not less than 24 inches in adjacent rows. a. Make joints between adjacent insulation boards not more than 1/4 inch in width. b. At internal roof drains, slope insulation to create a square drain sump with each side equal to the diameter of the drain bowl plus 24 inches. 1) Trim insulation so that water flow is unrestricted. c. Fill gaps exceeding 1/4 inch with insulation. d. Cut and fit insulation within 1/4 inch of nailers, projections, and penetrations. e. Adhere base layer of insulation to vapor retarder according to FM Approvals' RoofNav listed roof assembly requirements for specified Windstorm Resistance Classification and FM Global Property Loss Prevention Data Sheet 1-29, as follows: 1) Set insulation in ribbons of bead-applied insulation adhesive, firmly pressing and maintaining insulation in place. 2. Install upper layers of insulation and tapered insulation with joints of each layer offset not less than 12 inches from previous layer of insulation. a. Staggered end joints within each layer not less than 24 inches in adjacent rows. b. Trim insulation neatly to fit around penetrations and projections, and to fit tight to intersecting sloping roof decks. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 11 c. Make joints between adjacent insulation boards not more than 1/4 inch in width. d. At internal roof drains, slope insulation to create a square drain sump with each side equal to the diameter of the drain bowl plus 24 inches. 1) Trim insulation so that water flow is unrestricted. 2) At internal roof drains, provide a minimum of 7 inches of insualtion. e. Fill gaps exceeding 1/4 inch with insulation. f. Cut and fit insulation within 1/4 inch of nailers, projections, and penetrations. g. Adhere each layer of insulation to substrate using adhesive according to FM Approvals' RoofNav listed roof assembly requirements for specified Windstorm Resistance Classification and FM Global Property Loss Prevention Data Sheet 1- 29, as follows: 1) Set each layer of insulation in ribbons of bead-applied insulation adhesive, firmly pressing and maintaining insulation in place. 3.7 INSTALLATION OF COVER BOARDS A. Install cover boards over insulation with long joints in continuous straight lines with end joints staggered between rows. Offset joints of insulation below a minimum of 6 inches in each direction. 1. Trim cover board neatly to fit around penetrations and projections, and to fit tight to intersecting sloping roof decks. 2. At internal roof drains, conform to slope of drain sump. a. Trim cover board so that water flow is unrestricted. 3. Cut and fit cover board tight to nailers, projections, and penetrations. 4. Mechanically attach cover board using mechanical fasteners specifically designed and sized for fastening specified cover board and roof insulation to metal decks. 4. Adhere cover board to substrate using adhesive according to FM Approvals' RoofNav listed roof assembly requirements for specified Windstorm Resistance Classification and FM Global Property Loss Prevention Data Sheet 1-29, as follows: a. Set cover board in ribbons of bead-applied insulation adhesive, firmly pressing and maintaining insulation in place. 3.8 INSTALLATION OF ADHERED ROOF MEMBRANE A. Adhere roof membrane over area to receive roofing according to roofing system manufacturer's written instructions. B. Unroll roof membrane and allow to relax before installing. C. Start installation of roofing in presence of roofing system manufacturer's technical personnel Owner's testing and inspection agency. D. Accurately align roof membrane, and maintain uniform side and end laps of minimum dimensions required by manufacturer. Stagger end laps. E. Fabric-Backed Roof Membrane Adhesive: Apply to substrate at rate required by manufacturer, and install fabric-backed roof membrane. F. In addition to adhering, mechanically fasten roof membrane securely at terminations, penetrations, and perimeter of roofing. G. Apply roof membrane with side laps shingled with slope of roof deck where possible. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 12 H. Seams: Clean seam areas, overlap roofing, and hot-air weld side and end laps of roof membrane and sheet flashings to ensure a watertight seam installation. 1. Test lap edges with probe to verify seam weld continuity. Apply lap sealant to seal cut edges of roof membrane and sheet flashings. 2. Verify field strength of seams a minimum of twice daily, and repair seam sample areas. 3. Repair tears, voids, and lapped seams in roof membrane that do not comply with requirements. I. Spread sealant bed over deck-drain flange at roof drains, and securely seal roof membrane in place with clamping ring. 3.9 INSTALLATION OF BASE FLASHING A. Install sheet flashings and preformed flashing accessories, and adhere to substrates according to roofing system manufacturer's written instructions. B. Apply bonding adhesive to substrate and underside of sheet flashing at required rate, and allow to partially dry. Do not apply to seam area of flashing. C. Flash penetrations and field-formed inside and outside corners with cured or uncured sheet flashing. D. Clean seam areas, overlap, and firmly roll sheet flashings into the adhesive. Hot-air weld side and end laps to ensure a watertight seam installation. E. Terminate and seal top of sheet flashings and mechanically anchor to substrate through termination bars. 3.10 INSTALLATION OF WALKWAYS A. Flexible Walkways: Install walkway products according to manufacturer's written instructions. 1. Install flexible walkways at the following locations: a. Perimeter of each rooftop unit. b. Between each rooftop unit location, creating a continuous path connecting rooftop unit locations. c. Between each roof hatch and each rooftop unit location or path connecting rooftop unit locations. d. Top and bottom of each roof access ladder. e. Between each roof access ladder and each rooftop unit location or path connecting rooftop unit locations. f. Locations indicated on Drawings. g. As required by roof membrane manufacturer's warranty requirements. 2. Provide 6-inch clearance between adjoining pads. 3. Heat weld to substrate or adhere walkway products to substrate with compatible adhesive according to roofing system manufacturer's written instructions. 3.11 FIELD QUALITY CONTROL A. Testing Agency: Owner will engage a qualified testing agency to inspect substrate conditions, surface preparation, roof membrane application, sheet flashings, protection, and drainage components, and to furnish reports to Architect. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 13 B. Final Roof Inspection: Arrange for roofing system manufacturer's technical personnel to inspect roofing installation on completion, in presence of Architect, and to prepare inspection report. C. Repair or remove and replace components of roofing system where inspections indicate that they do not comply with specified requirements. D. Additional testing and inspecting, at Contractor's expense, will be performed to determine if replaced or additional work complies with specified requirements. 3.12 COMMISSIONING A. Facility Shell Commissioning: The building enclosure (including roofing) will be inspected and tested by Owner’s testing agency and witnessed by the Owner’s Commissioning Agent during construction. Comply with commissioning process requirements. 1. Commissioning Agent: During construction the Owner’s commissioning agent will perform site visits to observe that the construction is in general conformance with the Contract Documents. Observations by the Commissioning Agent will be on a “spot check” basis. 2. Commissioning requirements shall not reduce nor diminish the responsibility of Contractor, subcontractors, and material suppliers in performing the Work as required by Contract Documents. Requirements specified in commissioning requirements are in addition to requirements specified in related specification Sections. 3. Repair or replace materials, products, and components damaged by testing at no additional cost to Owner. Replace materials, products, and components that fail inspections and tests at no additional cost to Owner. 3.13 PROTECTING AND CLEANING A. Correct deficiencies in or remove membrane roofing system that does not comply with requirements; repair substrates; and repair or reinstall membrane roofing system to a condition free of damage and deterioration at time of Substantial Completion and according to warranty requirements. B. General Contractor shall protect membrane roofing system from damage and wear during remainder of construction period. When remaining construction will not affect or endanger roofing, inspect roofing for deterioration and damage, describing its nature and extent in a written report, with copies to Architect and Owner. C. General Contractor shall clean the entire roof surface to remove stains, dirt, and debris just prior to Substantial Completion. Verify acceptability of cleaning products/process with roofing manufacturer. 3.14 ROOFING INSTALLER'S WARRANTY A. WHEREAS _______________________________ of ___________________________, herein called the "Roofing Installer," has performed roofing and associated work ("work") on the following project: 1. Owner: Dennis-Yarmouth Regional School District. 2. Address: 296 Station Avenue, SouthYarmouth, MA. 3. Building Name/Type: Dennis-Yarmouth Intermediate / Middle School. 4. Address: 296 Station Avenue, South Yarmouth, MA. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 14 5. Area of Work: Roof. 6. Acceptance Date: _________________. 7. Warranty Period: 2 years. 8. Expiration Date: __________________. B. AND WHEREAS Roofing Installer has contracted (either directly with Owner or indirectly as a subcontractor) to warrant said work against leaks and faulty or defective materials and workmanship for designated Warranty Period, C. NOW THEREFORE Roofing Installer hereby warrants, subject to terms and conditions herein set forth, that during Warranty Period Roofing Installer will, at Roofing Installer's own cost and expense, make or cause to be made such repairs to or replacements of said work as are necessary to correct faulty and defective work and as are necessary to maintain said work in a watertight condition. D. This Warranty is made subject to the following terms and conditions: 1. Specifically excluded from this Warranty are damages to work and other parts of the building, and to building contents, caused by: a. lightning; b. peak gust wind speed exceeding 150 mph; c. fire; d. failure of roofing system substrate, including cracking, settlement, excessive deflection, deterioration, and decomposition; e. faulty construction of parapet walls, copings, chimneys, skylights, vents, equipment supports, and other edge conditions and penetrations of the work; f. vapor condensation on bottom of roofing; and g. activity on roofing by others, including construction contractors, maintenance personnel, other persons, and animals, whether authorized or unauthorized by Owner. 2. When work has been damaged by any of foregoing causes, Warranty shall be null and void until such damage has been repaired by Roofing Installer and until cost and expense thereof have been paid by Owner or by another responsible party so designated. 3. Roofing Installer is responsible for damage to work covered by this Warranty but is not liable for consequential damages to building or building contents resulting from leaks or faults or defects of work. 4. During Warranty Period, if Owner allows alteration of work by anyone other than Roofing Installer, including cutting, patching, and maintenance in connection with penetrations, attachment of other work, and positioning of anything on roof, this Warranty shall become null and void on date of said alterations, but only to the extent said alterations affect work covered by this Warranty. If Owner engages Roofing Installer to perform said alterations, Warranty shall not become null and void unless Roofing Installer, before starting said work, shall have notified Owner in writing, showing reasonable cause for claim, that said alterations would likely damage or deteriorate work, thereby reasonably justifying a limitation or termination of this Warranty. 5. During Warranty Period, if original use of roof is changed and it becomes used for, but was not originally specified for, a promenade, work deck, spray-cooled surface, flooded basin, or other use or service more severe than originally specified, this Warranty shall become null and void on date of said change, but only to the extent said change affects work covered by this Warranty. 6. Owner shall promptly notify Roofing Installer of observed, known, or suspected leaks, defects, or deterioration and shall afford reasonable opportunity for Roofing Installer to inspect work and to examine evidence of such leaks, defects, or deterioration. 7. This Warranty is recognized to be the only warranty of Roofing Installer on said work and shall not operate to restrict or cut off Owner from other remedies and resources lawfully Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 Addendum No. 3, February 19, 2021 POLYVINYL-CHLORIDE (PVC) ROOFING 07 5419 - 15 available to Owner in cases of roofing failure. Specifically, this Warranty shall not operate to relieve Roofing Installer of responsibility for performance of original work according to requirements of the Contract Documents, regardless of whether Contract was a contract directly with Owner or a subcontract with Owner's General Contractor. E. IN WITNESS THEREOF, this instrument has been duly executed this ___________ day of ___________________, ________________. 1. Authorized Signature: _______________________________________. 2. Name: ______________________________________. 3. Title: _______________________________________. END OF SECTION (THIS PAGE IS BLANK)