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Duro-Last Roofing, Inc. PVC Thermoplastic Membrane Roofing
 
         
SECTION 07 54 19
 
         
PVC THERMOPLASTIC MEMBRANE ROOFING
 
         
 
         
Copyright 2003 - 2011 ARCAT, Inc. - All rights reserved

          ** NOTE TO SPECIFIER ** Duro-Last Roofing, Inc.; reinforced PVC membrane roofing, fully adhered and mechanically fastened.
This section is based on the products of Duro-Last Roofing, Inc., which is located at:
525 Morley Dr. P. O. Box 3301
Saginaw, MI 48601
Toll Free Tel: 800-248-0280
Tel: 989-753-6486
Fax: 800-432-9331
Email: request info
Web: www.duro-last.com
[ Click Here ] for additional information.
Duro-Last Roofing, Inc. is the pioneer and one of the largest manufacturers of custom prefabricated roofing systems. The system is prefabricated in the Duro-Last manufacturing plants to meet the specific roofing needs of each project. 80 to 85 percent of field seams and other critical areas are welded under ideal factory conditions, greatly reducing the possibility of rooftop installation error.
The Duro-Last roofing system meets or exceeds major national fire and wind code requirements, as well as most of the regional code requirements throughout the country. 15 or 20-year commercial warranties and 15-year residential warranties are included at no cost.
 
          PART 1GENERAL
 
          1.1SECTION INCLUDES
          ** NOTE TO SPECIFIER ** Delete items below not required for project.
 
          A.Thermoplastic roofing membrane, mechanically fastened to substrate.
 
          B.Thermoplastic roofing membrane, fully adhered to substrate.
 
          C.Preparation of existing roof for recovering.
 
          D.Roof insulation.
 
          E.Prefabricated flashings, corners, parapets, stacks, vents, and related details.
 
          F.Fasteners, adhesives, and other accessories required for a complete roofing installation.
 
          G.Traffic Protection.
 
          1.2RELATED SECTIONS
          ** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
 
          A.Section 05 30 00 - Metal Decking.
 
          B.Section 06 10 00 - Rough Carpentry.
 
          C.Section 07 01 50.19 - Preparation for Re-Roofing.
 
          D.Section 07 62 00 - Sheet Metal Flashing and Trim.
 
          E.Section 07 71 23 - Manufactured Gutters and Downspouts.
 
          F.Section 07 72 33 - Roof Hatches.
 
          G.Section 07 72 63 - Waste Containment Assemblies.
 
          H.Section 08 62 19 - Vaulted Unit Skylights.
 
          I.Section 22 14 26.13 - Roof Drains.
 
          1.3REFERENCES
          ** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
 
          A.ASTM C 578 - Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation
 
          B.ASTM C 1177/C1177M - Standard Specification for Glass Mat Gypsum Substrate for Use as Sheathing.
 
          C.ASTM C 1289 - Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board.
 
          D.ASTM C 1396/C1396M - Standard Specification for Gypsum Board.
 
          E.ASTM D 146 - Standard Test Methods for Sampling and Testing Bitumen-Saturated Felts and Woven Fabrics for Roofing and Waterproofing.
 
          F.ASTM D 570 - Standard Test Method for Water Absorption of Plastics.
 
          G.ASTM D 751 - Standard Test Methods for Coated Fabrics.
 
          H.ASTM D 828 - Standard Test Method for Tensile Properties of Paper and Paperboard Using Constant-Rate-of-Elongation Apparatus.
 
          I.ASTM D1079 - Standard Terminology Relating to Roofing, Waterproofing, and Bituminous Materials.
 
          J.ASTM D 1204 - Standard Test Method for Linear Dimensional Changes of Nonrigid Thermoplastic Sheeting or Film at Elevated Temperature.
 
          K.ASTM D 2136 - Standard Test Method for Coated FabricsLow-Temperature Bend Test.
 
          L.ASTM D3045 - Standard Practice for Heat Aging of Plastics Without Load.
 
          M.ASTM D 4434 - Standard Specification for Poly(Vinyl Chloride) Sheet Roofing.
 
          N.ASTM D 5602 - Standard Test Method for Static Puncture Resistance of Roofing Membrane Specimens.
 
          O.ASTM D 5635 - Standard Test Method for Dynamic Puncture Resistance of Roofing Membrane Specimens.
 
          P.ASTM E 108 - Standard Test Methods for Fire Tests of Roof Coverings.
 
          Q.ASTM E 119 - Standard Test Methods for Fire Tests of Building Construction and Materials
 
          R.ASTM G 154 - Standard Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials.
 
          S.UL - Roofing Materials and Systems Directory, Roofing Systems (TGFU.R10128).
 
          T.Factory Mutual Global - Factory Mutual Standard 4470 - Approval Standard for Class 1 Roof Covers.
 
          U.ASCE 7 - Minimum Design Loads For Buildings And Other Structures.
 
          V.NRCA - The NRCA Roofing and Waterproofing Manual.
 
          W.SPRI - Wind Load Design Guide for Fully Adhered and Mechanically Fastened Roofing Systems.
 
          1.4SYSTEM DESCRIPTION
 
          A.General: Provide installed roofing membrane and base flashings that remain watertight; do not permit the passage of water; and resist specified uplift pressures, thermally induced movement, and exposure to weather without failure.
 
          B.Material Compatibility: Provide roofing materials that are compatible with one another under conditions of service and application required, as demonstrated by roofing membrane manufacturer based on testing and field experience.
          ** NOTE TO SPECIFIER ** Physical properties for 40 mil membrane. Delete if not being used.
 
          C.Physical Properties
          1.Roof product must meet the requirements of type IV PVC sheet roofing as defined by ASTM D 4434 and must meet or exceed the following physical properties.
          2.Thickness: 40 mil (1.0 mm), nominal in accordance with ASTM D 751.
          3.Breaking Strengths: greater than 430 lbf. (MD) and greater than 368 lbf. (XMD) in accordance with ASTM D 751, Grab Method.
          4.Elongation at Break: greater than 30 percent in accordance with ASTM D 751, Grab Method.
          5.Heat Aging in accordance with ASTM D 3045: 176 degrees F for 56 days. No sign of cracking, chipping or crazing. (In accordance with ASTM D 4434).
          6.Factory Seam Strength: greater than 468 lbf in accordance with ASTM D 751, Grab Method.
          7.Tearing Strength: greater than 91 lbf. (MD) and greater than 128 lbf. (XMD) in accordance with ASTM D 751, Procedure B.
          8.Low Temperature Bend (Flexibility): Pass at minus 40 degrees F in accordance with ASTM D 2136.
          9.Accelerated Weathering: No cracking, checking, crazing, erosion or chalking after 5,000 hours in accordance with ASTM G 154.
          10.Linear Dimensional Change: less than 0.5 percent in accordance with ASTM D 1204 at 176 plus or minus 2 degrees F for 6 hours.
          11.Water Absorption: less than 3 percent in accordance with ASTM D 570 at 158 degrees F for 166 hours.
          12.Static Puncture Resistance: greater than 56 lbs. in accordance with ASTM D 5602.
          13.Dynamic Puncture Resistance: greater than 474 pdl-ft in accordance with ASTM D 5635.
          ** NOTE TO SPECIFIER ** Physical properties for 50 mil membrane. Delete if not being used.
 
          D.Physical Properties
          1.Roof product must meet the requirements of type III PVC sheet roofing as defined by ASTM D 4434 and must meet or exceed the following physical properties.
          2.Thickness: 50 mil (1.25 mm), nominal in accordance with ASTM D 751.
          3.Breaking Strengths: greater than 472 lbf. (MD) and greater than 366 lbf. (XMD) in accordance with ASTM D 751, Grab Method.
          4.Elongation at Break: greater than 31 percent in accordance with ASTM D 751, Grab Method.
          5.Heat Aging in accordance with ASTM D 3045: 176 degrees F for 56 days. No sign of cracking, chipping or crazing. (In accordance with ASTM D 4434).
          6.Factory Seam Strength: greater than 575 lbf in accordance with ASTM D 751, Grab Method.
          7.Tearing Strength: greater than 68 lbf. (MD) and greater than 92 lbf. (XMD) in accordance with ASTM D 751, Procedure B.
          8.Low Temperature Bend (Flexibility): Pass at minus 40 degrees F in accordance with ASTM D 2136.
          9.Accelerated Weathering: No cracking, checking, crazing, erosion or chalking after 5,000 hours in accordance with ASTM G 154.
          10.Linear Dimensional Change: less than 0.5 percent in accordance with ASTM D 1204 at 176 plus or minus 2 degrees F for 6 hours.
          11.Water Absorption: less than 3 percent in accordance with ASTM D 570 at 158 degrees F for 166 hours.
          12.Static Puncture Resistance: greater than 56 lbs. in accordance with ASTM D 5602.
          13.Dynamic Puncture Resistance: greater than 474 pdl-ft in accordance with ASTM D 5635.
          ** NOTE TO SPECIFIER ** Physical properties for 60 mil membrane. Delete if not being used.
 
          E.Physical Properties
          1.Roof product must meet the requirements of type III PVC sheet roofing as defined by ASTM D 4434 and must meet or exceed the following physical properties.
          2.Thickness: 60 mil (1.52 mm), nominal in accordance with ASTM D 751.
          3.Breaking Strengths: greater than 438 lbf. (MD) and greater than 390 lbf. (XMD) in accordance with ASTM D 751, Grab Method.
          4.Elongation at Break: greater than 31 percent in accordance with ASTM D 751, Grab Method.
          5.Heat Aging in accordance with ASTM D 3045: 176 degrees F for 56 days. No sign of cracking, chipping or crazing. (In accordance with ASTM D 4434).
          6.Factory Seam Strength: greater than 431 lbf in accordance with ASTM D 751, Grab Method.
          7.Tearing Strength: greater than 132 lbf. (MD) and greater than 163 lbf. (XMD) in accordance with ASTM D 751, Procedure B.
          8.Low Temperature Bend (Flexibility): Pass at minus 40 degrees F in accordance with ASTM D 2136.
          9.Accelerated Weathering: No cracking, checking, crazing, erosion or chalking after 5,000 hours in accordance with ASTM G 154.
          10.Linear Dimensional Change: less than 0.5 percent in accordance with ASTM D 1204 at 176 plus or minus 2 degrees F for 6 hours.
          11.Water Absorption: less than 3 percent in accordance with ASTM D 570 at 158 degrees F for 166 hours.
          12.Static Puncture Resistance: greater than 56 lbs. in accordance with ASTM D 5602.
          13.Dynamic Puncture Resistance: greater than 14.7 ft-lbf in accordance with ASTM D 5635.
          ** NOTE TO SPECIFIER ** Physical properties for 50 mil and 60 mil fleeceback membrane. Delete if not being used.
 
          F.Physical Properties: Meets the requirements of type III PVC sheet roofing as defined by ASTM D 4434 and must meet or exceed the following physical properties.
          1.Thickness:
          a.50 mil (1.25 mm) 80 mil (2.0 mm) overall, nominal in accordance with ASTM D 751.
          b.60 mil (1.52 mm) 90 mil (2.25 mm) overall, nominal in accordance with ASTM D 751.
          2.Breaking Strengths: greater than 200 lbf/in in accordance with ASTM D 751, Grab Method.
          3.Elongation at Break: greater than 15 percent in accordance with ASTM D 751, Grab Method.
          4.Seam Strength: Minimum 293 lbf. (75 percent of Breaking Strength) in accordance with ASTM D 751, Grab Method.
          5.Tearing Strength: greater than 45 lbf in accordance with ASTM D 751, Procedure B.
          6.Low Temperature Bend (Flexibility): Pass at minus 40 degrees F in accordance with ASTM D 2136.
          7.Heat Aging in accordance with ASTM D 3045: 176 degrees F for 56 days. No sign of cracking, chipping or crazing.
          8.Accelerated Aging: No cracking, checking, crazing, erosion or chalking after 5,000 hours in accordance with ASTM G 154.
          9.Linear Dimensional Change: less than 0.5 percent in accordance with ASTM D 1204 at 176 plus or minus 2 degrees F for 6 hours.
          10.Water Absorption: less than 3 percent in accordance with ASTM D 570 at 158 degrees F for 166 hours.
          11.Static Puncture Resistance: greater than 33 lbf in accordance with ASTM D 5602.
          12.Dynamic Puncture Resistance: greater than 474 pdl-ft in accordance with ASTM D 5635.
 
          1.5SUBMITTALS
 
          A.Submit under provisions of Section 01 30 00 - Administrative Requirements.
 
          B.Product Data: Manufacturer's data sheets on each product to be used, including:
          1.Preparation instructions and recommendations.
          2.Storage and handling requirements and recommendations.
          3.Installation methods.
          4.Maintenance requirements.
 
          C.Shop Drawings: Indicate insulation pattern, overall membrane layout, field seam locations, joint or termination detail conditions, and location of fasteners.
 
          D.Verification Samples: For each finish product specified, two samples, representing actual product, color, and finish.
          1.4 inch by 6 inch (102 by 150 mm) sample of roofing membrane, of color specified.
          2.Sample of roofing membrane with factory weld and T-shaped lap.
          3.4 inch by 6 inch (102 mm by 150 mm) sample of walkway pad.
          4.Termination bar, fascia bar with cover, drip edge and gravel stop if to be used.
          5.Each fastener type to be used for installing membrane, insulation/recover board, termination bar and edge details.
 
          E.Manufacturer's Certificates: Certify products meet or exceed specified requirements.
 
          F.Installer Certification: Certification from the roofing system manufacturer that Installer is approved, authorized, or licensed by manufacturer to install roofing system.
 
          G.Manufacturers warranties.
 
          1.6QUALITY ASSURANCE
 
          A.Perform work in accordance with NRCA ML104 and manufacturer's installation instructions.
 
          B.Manufacturer Qualifications: A manufacturer specializing in the production of PVC membranes systems and utilizing a Quality Control Manual during the production of the membrane roofing system that has been approved by and is inspected by Underwriters Laboratories.
 
          C.Installer Qualifications: Company specializing in installation of roofing systems similar to those specified in this project and approved by the roofing system manufacturer.
 
          1.7REGULATORY REQUIREMENTS
          ** NOTE TO SPECIFIER ** Use the following paragraphs carefully; edit specification to identify system performance requirements or functional criteria. Delete references from the list below that are not actually required by the text of the edited section.
 
          A.Conform to applicable code for roof assembly wind uplift and fire hazard requirements.
          ** NOTE TO SPECIFIER ** Apply fire exposure rating required by the applicable building code and the Owner's insurance underwriter. Fire exposure ratings may also significantly affect insurance premiums. Apply only to specific installations over approved substrates. Consult with manufacturer to verify that the desired classification is available for system components as specified; delete all but one classification.
 
          B.Fire Exposure: Provide membrane roofing materials with the following fire-test-response characteristics. Materials shall be identified with appropriate markings of applicable testing and inspecting agency.
          1.Exterior Fire-Test Exposure:
          a.Class A; ASTM E 108, for application and roof slopes indicated.
          b.Class B; ASTM E 108, for application and roof slopes indicated.
          c.Class C; ASTM E 108, for application and roof slopes indicated.
          2.Fire-Resistance Ratings: Comply with ASTM E 119 for fire-resistance-rated roof assemblies of which roofing system is a part.
          3.Conform to applicable code for roof assembly fire hazard requirements.
          ** NOTE TO SPECIFIER ** Apply wind uplift rating required by the applicable building code and/or the Owner's insurance underwriter. Wind uplift ratings may significantly affect insurance premiums and apply only to specific installations over approved substrates. Consult with manufacturer to verify that desired rating is available for system components as specified; delete all but one rating.
 
          C.Wind Uplift:
          1.FMG: Provide roofing membrane, base flashings, and component materials that comply with requirements in FMG 4450 and FMG 4470 as part of a membrane roofing system and that are listed in FMG's Approval Guide for Class 1 or noncombustible construction, as applicable. Identify materials with FMG markings.
          a.Class 1A-60
          b.Class 1A-75
          c.Class 1A-90
          2.Conform to applicable building code for roof assembly wind uplift requirements.
          ** NOTE TO SPECIFIER ** Apply building energy requirements required by building codes and design requirements for the selection of insulation and may be significantly affected by roof insulation. Verify that method of determining energy use is consistent with components specified; delete all but one of the subparagraphs. Consult with manufacturer to verify that desired requirements are available for system components specified.
 
          D.Thermal Resistance: Provide overall thermal resistance for roofing system as follows:
          1.Minimum U-value, in accordance with ASHRAE 90.1: ___________.
          2.Thickness of thermal insulation specified: ____ inches (___ mm).
          3.Configuration as indicated on the Drawings.
 
          1.8PRE-INSTALLATION MEETING
 
          A.Convene meeting not less than one week before starting work of this section.
 
          B.Review methods and procedures related to roof deck construction and roofing system including, but not limited to, the following.
          1.Meet with Owner, Architect, 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.
          2.Review and finalize construction schedule and verify availability of materials, Installer's personnel, equipment, and facilities needed to make progress and avoid delays.
          3.Examine deck substrate conditions and finishes for compliance with requirements, including flatness and fastening.
          4.Review structural loading limitations of roof deck during and after roofing.
          5.Review base flashings, special roofing details, roof drainage, roof penetrations, equipment curbs, and condition of other construction that will affect roofing system.
          6.Review governing regulations and requirements for insurance and certificates if applicable.
          7.Review temporary protection requirements for roofing system during and after installation.
          8.Review roof observation and repair procedures after roofing installation.
 
          1.9DELIVERY, 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, 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.
 
          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.Store roof materials and place equipment in a manner to avoid permanent deflection of deck.
 
          E.Store and dispose of solvent-based materials, and materials used with solvent-based materials, in accordance with requirements of local authorities having jurisdiction.
 
          1.10PROJECT CONDITIONS
 
          A.Proceed with installation only when existing and forecasted weather conditions permit roofing system to be installed according to manufacturer's specification.
 
          B.Do not apply roofing membrane during inclement weather, or to damp or frozen deck surface or when precipitation is anticipated.
 
          C.Do not expose materials vulnerable to water or sun damage in quantities greater than can be weatherproofed in the same day.
 
          1.11WARRANTY
 
          A.See Section 01 78 23.19 - Preventative Maintenance Instructions.
 
          B.Installer Warranty: Warrant the workmanship and proper application of roof system for two years from the date of favorable inspection by the roof membrane manufacturer. Repair any leaks covered under the warranty that occur during this period to the satisfaction of the Owner and the roof membrane manufacturer. All corrective work will be done at no cost to the Owner.
          ** NOTE TO SPECIFIER ** Select one of the following three manufacturers warranty paragraphs and delete those not required.
 
          C.Manufacturer Warranty: Provide a no-dollar limit type warranty with provisions for completion of repairs, replacement of membrane or total replacement of the roofing system at the then-current material and labor prices throughout the life of the warranty. Warranty must also meet the following criteria
          1.Warranty Period: 15 years from date issued.
          2.Include no exclusions for damage caused by ponded water or biological growth, or for incidental or consequential damages.
          3.Issued direct from and serviced by the roof membrane manufacturer.
          4.Be transferable for the full term of the warranty.
          5.Include no additional charges for the warranty.
 
          D.Manufacturer Warranty: Provide a no-dollar limit type warrantee with provisions for completion of repairs, replacement of membrane or total replacement of the roofing system at the then-current material and labor prices for the first ten years of the warranty and then on a pro-rated basis based on the then-current material price during the second 10-years of the warranty. Warranty must also meet the following criteria:
          1.Warranty Period: 20 years from date issued.
          2.Include no exclusions for damages caused by ponded water or biological growth, or for incidental or consequential damages.
          3.Issued direct from and serviced by the roof membrane manufacturer.
          4.Be transferable for the full term of the warranty.
          5.Include no additional charges for the warranty.
 
          E.Manufacturer Warranty: Warrant that the membrane, material and accessories are free from manufacturing defects at the time of delivery and will not become defective during the term of the limited warranty. Warranty must also meet the following criteria:
          1.Warranty Period: 15 years from date issued.
          2.Issued direct from the roof membrane manufacturer.
          3.Be transferable for the full term of the warranty.
          4.Include no additional charge for the warranty.
 
          PART 2PRODUCTS
 
          2.1MANUFACTURERS
 
          A.Acceptable Manufacturer: Duro-Last Roofing, Inc., which is located at: 525 Morley Dr. P. O. Box 3301 ; Saginaw, MI 48601; Toll Free Tel: 800-248-0280; Tel: 989-753-6486; Fax: 800-432-9331; Email: request info; Web: www.duro-last.com
 
          B.Provide all roofing system components by a single manufacturer, or as approved by membrane manufacturer.
          ** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
 
          C.Substitutions: Not permitted.
 
          D.Requests for substitutions will be considered in accordance with provisions of Section 01 60 00 - Product Requirements.
 
          2.2ROOFING SYSTEM COMPONENTS
          ** NOTE TO SPECIFIER ** Select the membrane type and thickness required from the following two paragraphs and delete the those not required.
 
          A.Roofing Membrane: Duro-Last Specially Formulated Roofing Membrane by Duro-Last Roofing, Inc. conforming to ASTM D 4434, Type III or IV, fabric reinforced, PVC. Membrane properties as follows:
          1.Thickness:
          ** NOTE TO SPECIFIER ** Select one of the following thicknesses and delete the one not required.
          a.40 mil (1.0 mm), nominal.
          b.50 mil (1.25 mm), nominal.
          c.60 mil (1.52 mm), nominal.
          2.Exposed Face Color:
          ** NOTE TO SPECIFIER ** Select one of the following color paragraphs and delete the ones not required. Note that Terra Cota is available in 50 mil thickness only.
          a.White.
          b.Gray.
          c.Dark Gray.
          d.Tan.
          e.Terra Cotta.
 
          B.Roofing Membrane: Duro-Last Specially Formulated Roofing Membrane by Duro-Last Roofing, Inc. conforming to ASTM D 4434, Type III or IV, fabric reinforced, fleeceback PVC. Membrane properties as follows:
          1.Thickness:
          ** NOTE TO SPECIFIER ** Select one of the following thicknesses and delete the one not required.
          a.50 mil (1.25 mm) 80 mil (2.0 mm) overall.
          b.60 mil (1.52 mm) 90 mil (2.25 mm) overall.
          2.Exposed Face Color:
          a.White.
 
          C.Accessory Materials: Provide accessory materials as manufactured by the roof membrane manufacturer.
          1.Sheet Flashing: Manufacturer's standard sheet flashing of same material, type, reinforcement, thickness, and color as PVC sheet membrane.
          2.Prefabricated Flashing: Prefabricated flashings for pipes, curbs, inside and outside corners of same material, type, reinforcement, and color as PVC sheet membrane.
          3.Sealants and Adhesives: Caulk, pourable sealant, mastic and adhesives compatible with roofing system.
          4.Slip Sheet and Cover Boards: Slip sheet or cover boards, of type required by roof membrane manufacturer for the application.
          5.Termination Bars: Standard rigid exterior vinyl bar, 1.5 inches (38 mm) wide with slotted holes 6 inches (152 mm) on center.
          6.Edge Detail: Fascia bar and cover, prefabricated Drip Edge, prefabricated Gravel Stop, 2-Piece Compression Metal Edge.
          7.Vinyl Coated Metal: 24 gauge, hot-dipped galvanized, grade 90 metal with a minimum of 17 mil of Duro-Last membrane laminated to one side.
          8.Fasteners: Factory-coated steel fasteners and metal or plastic plates meeting corrosion-resistance provisions in FMG 4470, designed for fastening membrane to substrate.
          9.Two-Way Roof Vents: As recommended by roof membrane manufacturer and installed with a minimum of 1 vent for each 1,000 square-feet (93 sm) of roof area.
          ** NOTE TO SPECIFIER ** Select one of the following paragraphs for use over roof substrate of existing roofing system as required. Edit the paragraph to indicate the material and the thickness required. Delete entirely if not required.
 
          D.Substrate Board:
          1.Gypsum wall board conforming to ASTM C 1396/C 1396M. Provide to:
          a.___ inch (___ mm) thick.
          b.Thickness indicated on the Drawings.
          2.Glass-mat-faced, water-resistant gypsum substrate conforming to ASTM C 1177/C 1177M, Dens-Deck Roof Board as manufactured by Georgia-Pacific Corporation. Provide to:
          a.___ inch (___ mm) thick.
          b.Thickness indicated on the Drawings.
          3.Fiber-reinforced, water-resistant gypsum substrate. SECUROCK Roof Board as manufactured by United States Gypsum Company. Provide to:
          a.___ inch (___ mm) thick.
          b.Thickness indicated on the Drawings.
          ** NOTE TO SPECIFIER ** Select the following paragraph for use over roof substrate of existing roofing system as required. Edit the paragraph to select the underlayment required. Delete entirely if not required. Not required for use with fleeceback membrane.
 
          E.Fan-Fold Board:
          1.Duro-Last Duro-Fold Underlayment.
          2.Duro-Last Ultra-Fold TPM Underlayment.
          3.Duro-Last Duro-Tech Underlayment.
          ** NOTE TO SPECIFIER ** Select the following paragraph for use over roof substrate of existing roofing system as required. Edit the paragraph to select the material required. Delete entirely if not required. Not required for use with fleeceback membrane.
 
          F.Coated Glass Fiber Slip Sheet:
          1.Conforming to ASTM D 146 and D 828, coated glass fiber slip sheet as approved by roof membrane manufacturer and that provides the required fire classification.
          a.Elk Versashield FB1S by Elk Corporation of America.
          b.Elk Versashield FB2S by Elk Corporation of America.
          c.Atlas FR 10 by Atlas Roofing Corporation.
          d.Atlas FR 50 by Atlas Roofing Corporation.
          2.Number of plies of the coated glass fiber slip-sheet:
          ** NOTE TO SPECIFIER ** Select one of the following paragraphs and delete the one not required.
          a.Install the number of plies necessary to achieve the required fire classification.
          b.Install __ plies.
          ** NOTE TO SPECIFIER ** Select the following paragraph for use over existing roofing system or insulation as required. Delete entirely if not required. Not required for use with fleeceback membrane.
 
          G.Slip Sheet: Duro-Last Nova Rollout Underlayment.
 
          H.Walkways: Provide non-skid, maintenance-free walkway pads in areas of heavy foot traffic and around mechanical equipment. Walkway pads must be as manufactured by roof membrane manufacturer.
          ** NOTE TO SPECIFIER ** Edit the following insulation paragraphs as applicable for the Project. Delete if not relevant to project.
 
          2.3ROOF INSULATION
 
          A.General:
          1.Provide preformed roof insulation boards that comply with requirements and referenced standards, as selected from manufacturer's standard sizes.
          2.Provide preformed saddles, crickets, tapered edge strips, and other insulation shapes where indicated for sloping to drain. Fabricate to slopes indicated.
          ** NOTE TO SPECIFIER ** Select one of the following insulation paragraphs for fully adhered or mechanically fastened systems as applicable for the Project. Delete the paragraphs that are not relevant to project.
 
          B.Polyisocyanurate Board Insulation: Complying with ASTM C 1289, Type II, felt or glass-fiber mat facer on both major surfaces. Material as approved by the roof membrane manufacturer and as manufactured by:
          1.Apache Products Company.
          2.Atlas Roofing Corporation.
          3.Celotex Corporation.
          4.Dow Chemical Company.
          5.Hunter Panels.
          6.Koppers, Inc.
          7.R-Max, Inc.
          8.U.S. Intec, Inc.
 
          C.Expanded Polystyrene (EPS) Board Insulation: Material as approved by the roof membrane manufacturer:
          1.Density: Minimum 1.5 PCF (24 Kg/m3).
          2.Compressive Resistance: Minimum 18 PSI (124 kPa).
          3.As manufactured by:
          a.F M R-Control Building Systems.
          b.Avron, Inc.
          c.Benchmark Foam, Inc.
          d.Certainteed Corporation.
          e.Diversi-Foam Products.
          f.Falcon Foam.
          g.Premier Industries, Inc.
 
          D.Extruded-Polystyrene (XPS) Board Insulation: Material as approved by the roof membrane manufacturer:
          1.Density: Minimum 1.5 PCF (24 Kg/m3).
          2.Compressive Resistance: Minimum 25 PSI (172 kPa).
          3.As manufactured by:
          a.Certainteed Corporation.
          b.Dow Chemical Company.
          c.Owens Corning.
          d.Pactiv Building Products.
          e.T-Clear Corporation.
          f.Premier Industries, Inc.
          ** NOTE TO SPECIFIER ** Edit the following insulation accessory paragraphs as applicable for the Project. Delete if not relevant to project.
 
          2.4ROOF INSULATION ACCESSORIES
 
          A.General: Provide roof insulation accessories approved by the roof membrane manufacturer and as recommended by insulation manufacturer for the intended use.
 
          B.Fasteners: Provide Duro-Last factory-coated steel fasteners and metal or plastic plates meeting corrosion-resistance provisions in FMG 4470, designed for fastening membrane and insulation to substrate in conformance to specified design requirements.
          ** NOTE TO SPECIFIER ** Select the one of the following paragraphs for use over insulation as required rigid surface or fire classification requirements. Edit to indicate the material and the thickness required. Delete entirely if not required.
 
          C.Substrate Board:
          1.Gypsum wall board conforming to ASTM C 1396/C 1396M. Provide to:
          a.___ inch (___ mm) thick.
          b.Thickness indicated on the Drawings.
          2.Glass mat-faced, water-resistant gypsum substrate conforming to ASTM C 1177/C 1177M, Dens-Deck Roof Board as manufactured by Georgia-Pacific Corporation. Provide to:
          a.___ inch (___ mm) thick.
          b.Thickness indicated on the Drawings.
          3.Fiber-reinforced, water-resistant gypsum substrate. SECUROCK Roof Board as manufactured by United States Gypsum Company. Provide to:
          a.___ inch (___ mm) thick.
          b.Thickness indicated on the Drawings.
          ** NOTE TO SPECIFIER ** Select the following paragraph for use over insulation as required rigid surface or fire classification requirements. Edit to indicate the material required. Delete entirely if not required. Not required for use with fleeceback membrane.
 
          D.Fan-Fold Board:
          1.Duro-Last Duro-Fold Underlayment.
          2.Duro-Last Ultra-Fold TPM Underlayment.
          3.Duro-Last Duro-Tech Underlayment.
          ** NOTE TO SPECIFIER ** Select the following paragraph for use over insulation as required rigid surface or fire classification requirements. Edit to indicate the material required. Delete entirely if not required. Not required for use with fleeceback membrane.
 
          E.Coated Glass Fiber Slip Sheet:
          1.Conforming to ASTM D 146 and D 828, coated glass fiber slip sheet as approved by roof membrane manufacturer and that provides the required fire classification.
          a.Elk Versashield FB1S by Elk Corporation of America.
          b.Elk Versashield FB2S by Elk Corporation of America.
          c.Atlas FR 10 by Atlas Roofing Corporation.
          d.Atlas FR 50 by Atlas Roofing Corporation.
          2.Number of plies of the coated glass fiber slip-sheet:
          ** NOTE TO SPECIFIER ** Select one of the following paragraphs and delete the one not required.
          a.Install the number of plies necessary to achieve the required fire classification.
          b.Install __ plies.
          3.Slip Sheet: Duro-Last Nova Rollout Underlayment.
          ** NOTE TO SPECIFIER ** Select the following paragraph for use over existing roofing system or insulation as required. Delete entirely if not required. Not required for use with fleeceback membrane.
 
          F.Slip Sheet: Duro-Last Nova Rollout Underlayment.
 
          PART 3EXECUTION
 
          3.1EXAMINATION
 
          A.Verify that the surfaces and site conditions are ready to receive work.
 
          B.Verify that the deck is supported and secured.
 
          C.Verify that the deck is clean and smooth, free of depressions, waves, or projections, and properly sloped to drains, valleys, eaves, scuppers or gutters.
 
          D.Verify that the deck surfaces are dry and free of standing water, ice or snow.
 
          E.Verify that all roof openings or penetrations through the roof are solidly set.
 
          F.If substrate preparation is the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.
          ** NOTE TO SPECIFIER ** Include the following paragraph for re-roofing projects only. Delete if not required.
 
          G.Prior to recovering an existing roofing system, conduct an inspection of the roof system accompanied by a representative of the membrane manufacturer or an authorized contractor.
          1.Determine required fastener type, length, and spacing.
          2.Verify that moisture content of existing roofing is within acceptable limits.
          3.Identify damaged areas requiring repair before installation of new roofing.
          4.Conduct core cuts as required to verify information required.
          ** NOTE TO SPECIFIER ** Include the following paragraph for mechanically fastened membrane projects only. Delete if not required.
 
          H.Fastener pullout tests must be conducted on the roof deck with approved fasteners to verify the integrity of the deck and to establish fastening patterns for mechanically attached insulation and cover boards as well as the fastener spacing around roof penetrations.
          1.Conduct tests in the presents of a representative of the membrane manufacturer.
          2.Test sections of decking where integrity is in question. Document pullout tests on a roof drawing showing the location and pullout value of each test. Where new construction prevents on-site pullout tests, perform tests on a pre-assembled deck representing the proposed deck type.
          3.Perform a minimum of 10 tests for up to 50,000 sf (4,645 m2) and five additional pull tests for each additional 50,000 sf or portion thereof. Areas of low pullout results will require additional pullout tests.
          4.Verify pullout values prior to installation and determine required fastener type, length, and spacing.
          ** NOTE TO SPECIFIER ** Include the following paragraph for adhered membrane projects only. Delete if not required.
 
          I.Adhesion tests must be performed when attaching insulation or cover boards to an existing roof system.
          1.Conduct tests in the presents of a representative of the membrane manufacturer.
          2.Install a 2 foot by 2 foot (610 mm by 610 mm) section of board to a representative areas of the roof.
          3.Apply 2 beads of adhesive 12 inches (305 mm) apart and 6 inches (152.5 mm) from the edge.
          4.After the adhesive cures, attempt to pop the board off of the surface using a flat shovel or spud bar.
          5.If the board breaks apart while the contact between the adhesive and the roof remains intact, the test is a success. If the adhesive separates from the roof, the test is unsuccessful and an alternative method of attachment must be found.
 
          3.2PREPARATION
 
          A.Clean surfaces thoroughly prior to installation.
 
          B.Prepare surfaces using the methods recommended by the manufacturer for achieving the best result for the substrate under the project conditions.
 
          C.Surfaces shall be clean, smooth, free of fins, sharp edges, loose and foreign material, oil, grease, and bitumen.
          ** NOTE TO SPECIFIER ** Select the one of following two paragraphs as applicable for re-roofing projects only and delete the one not required. Delete both paragraphs if not applicable.
 
          D.Re-Roofing Over Existing Single-Ply System:
          1.Remove and replace areas of deteriorated decking, blocking, insulation, and any materials saturated with moisture.
          2.Cut existing membrane free from entire roof perimeter and from around all penetrations.
          3.Slice membrane in a 10 foot (3 m) grid pattern throughout field of roof.
          4.Remove all loose or high fasteners.
          ** NOTE TO SPECIFIER ** Delete the following paragraph if not applicable.
          5.Remove PVC membrane installed directly over styrene insulation board and repair damaged insulation.
          6.Repair core cuts before proceeding with new roofing installation.
 
          E.Re-Roofing Over Existing Bituminous Roofing:
          1.Remove and replace areas of deteriorated decking, blocking, insulation, and any materials saturated with moisture.
          2.Remove loose gravel and level remaining gravel to provide suitable substrate.
          3.Cut or remove all blisters.
          4.Repair core cuts before proceeding with new roofing installation.
 
          F.Ensure that roof deck is structurally sound and in appropriate condition to begin installation of roofing system.
 
          G.Wood Nailers:
          1.Provide nailers as indicated on the Drawings and as required by the roof membrane manufacturer.
          2.Conform to requirements of Section 06 10 00 - Rough Carpentry.
          3.Provide nailers at the entire roof perimeter where insulation thickness is 1 inch (25 mm) or more.
          4.Anchor to deck, wall, or existing nailers to resist minimum force of 180 lbf/ft (2627 N/m) in any direction. Space fasteners not more than 18 inches (457 mm) apart.
          5.Thickness of nailer shall be such that the top of the nailer is flush with the surface to which the membrane is to be applied.
 
          3.3INSTALLATION
 
          A.Install roofing system in accordance with the membrane manufacturer's installation instructions.
 
          B.Insulation: Install insulation in accordance with the insulation manufacturers requirements as approved by the roof membrane manufacturer.
          1.Insulation shall be adequately supported to sustain normal foot traffic without damage.
          2.Insulation materials shall be installed in parallel courses with end joints staggered 50 percent and adjacent boards butted together with no gaps greater than 1/4 inch (6.3 mm).
          3.If more than one layer of insulation is used, all joints between subsequent layers shall be offset by 50 percent.
          4.Where field trimmed, insulation shall be fitted tightly around roof protrusions and terminations.
          5.Tapered insulation boards shall be installed in accordance with the insulation manufacture's shop drawings.
          6.No more insulation shall be applied than can be covered with the roof membrane by the end of the day or the onset of inclement weather.
          ** NOTE TO SPECIFIER ** Select one of the following paragraphs for fully adhered or mechanically fastened systems as applicable for the Project. Delete the paragraph that is not relevant to project.
 
          C.Mechanical Insulation Attachment: Use only fasteners, stress plates and fastening patterns accepted for use by roof membrane manufacturer using fastening patterns that meets applicable design requirements.
 
          D.Adhered Insulation Attachment: Use only adhesive acceptable to both roof membrane manufacturer and the insulation manufacturer that meets applicable design requirements.
 
          E.Install fasteners in accordance with roof membrane manufacturer' requirements. Fasteners that are improperly installed shall be removed or corrected.
 
          F.Separation Layer: If required, install recover board or slip sheet directly over the substrate in accordance with roof membrane manufacturer's requirements.
          ** NOTE TO SPECIFIER ** Select one of the following membrane installation paragraphs for fully adhered or mechanically fastened systems as applicable for the Project. Delete the paragraphs that are not relevant to project.
 
          G.Mechanically Fastened Membrane:
          1.Mechanically fastened membrane to the structural deck utilizing fasteners and fastening patterns that in accordance with roof membrane manufacturer's requirements.
          2.Cut membrane to fit neatly around all penetrations and roof projections.
          3.Unroll roofing membrane and positioned with a minimum 6 inch overlap.
 
          H.Adhered Membrane:
          1.Adhere the membrane to the insulation or acceptable surface using adhesive, tools and techniques required by the roof membrane manufacturer's requirements.
          2.Cut membrane to fit neatly around all penetrations and roof projections.
          3.Unroll roofing membrane and positioned with a minimum 6 inch overlap.
          4.Apply adhesive in accordance with roof membrane manufacturer's requirements.
          5.Apply at the required rate in smooth, even coatings without voids, globs, puddles or similar irregularities. Use care not to contaminate the area of the membrane where hot air welding will occur.
 
          I.Seaming:
          1.Weld overlapping sheets together using hot air. Minimum weld width is 1-1/2 inches (38 mm).
          2.Check welded seams for continuity and integrity by the end of each work day. Repair all imperfections.
 
          J.Membrane Termination/Securement: All membrane terminations shall be completed in accordance with roof membrane manufacturer's requirements.
          1.Provide securement at all membrane terminations at the perimeter of each roof level, roof section, curb flashing, skylight, expansion joint, interior wall, penthouse, and other similar condition.
          2.Provide securement at any angle change where the slope or combined slopes exceeds two inches in one horizontal foot.
 
          K.Flashings: Complete all flashings and terminations as indicated on the Drawings and in accordance with roof membrane manufacturer's requirements.
          1.Base and Wall Flashings:
          a.Do not apply flashing over existing thru-wall flashings or weep holes.
          b.Secure flashing on a vertical surfaces before the seam between the flashing and the main roof sheet is completed.
          c.Extend flashing membrane a minimum of 6 inches (152 mm) onto the main roof sheet beyond the mechanical securement.
          d.Use care to ensure that the flashing does not bridge locations where there is a change in direction (e.g. where the parapet meets the roof deck).
          2.Penetrations:
          a.Flash all pipes, supports, soil stacks, cold vents, and other penetrations passing through the roofing membrane as indicated on the Drawings and in accordance with roof membrane manufacturer's requirements.
          b.Utilize custom prefabricated flashings supplied by roof membrane manufacture.
          c.Existing Flashings: Remove when necessary to allow new flashing to terminate directly to the penetration.
          3.Pipe Clusters and Unusual Shapes:
          a.Clusters of pipes or other penetrations which cannot be sealed with prefabricated flashings or membrane shall be sealed by surrounding them with pourable sealer supplied by roof membrane manufacturer.
          b.Penetration pans shall be installed, flashed and filled with pourable sealer in accordance with roof membrane manufacturer's requirements.
          c.Penetration pans shall not be used where prefabricated or field fabricated flashings are possible.
 
          L.Roof Drains:
          ** NOTE TO SPECIFIER ** Select one of the following roof drain paragraphs as applicable for the Project. Delete the paragraph that is not required.
          1.Coordinate installation of roof drains and vents specified in Section 22 14 26.13 - Roof Drains.
          2.Remove existing flashing and asphalt at existing drains in preparation for sealant and membrane.
          3.Provide a smooth clean surface on the mating surface between the clamping ring and the drain base.
          4.Taper insulation around the drain to prevent the membrane from bridging and to provide a smooth transition from the roof surface to the drain clamping ring.
          5.Use sealant to seal between the membrane and the drain base using constant, even compression from the drain clamping ring.
 
          M.Fascia/Drip Edge/Gravel Stop:
          1.Provide fascia bar and cover, drip edge and gravel stop as indicated on the Drawings. Install in accordance with roof membrane manufacturer's requirements.
          2.Seal joints between individual sections in accordance with roof membrane manufacturer's requirements.
          3.Coordinate installation of metal flashing and counter flashing specified in Section 07 62 00 - Sheet Metal Flashing and Trim.
          4.Manufactured Roof Specialties: Coordinate installation of copings, counter flashing systems, gutters, downspouts, and roof expansion assemblies specified in Section 07 71 23 - Manufactured Gutters and Downspouts.
 
          N.Walkways: Install walkways in accordance with roof membrane manufacturer's requirements.
          ** NOTE TO SPECIFIER ** Select one of the following two paragraphs as applicable for the Project. Delete the paragraph that is not required.
          1.Provided walkways where indicated on the Drawings.
          2.Install at roof hatches, access doors, rooftop ladders and all other traffic concentration points regardless of traffic frequency. Provided in areas receiving regular traffic to service rooftop units or where a passageway over the surface is required.
          3.Do not install walkways over flashings or fields seams until field inspections by roof membrane manufacturer have been completed.
 
          O.Water cut-offs: Provide water cut-offs to ensure that water does not flow beneath the completed sections of the new roofing system.
          1.Provide water cut-offs on a daily basis at the completion of work and at the onset of inclement weather.
          2.Remove water cut-offs prior to the resumption of work.
          3.The integrity of the water cut-off is the sole responsibility of the roofing contractor.
          4.Any membrane contaminated by the cut-off material shall be cleaned or removed.
 
          3.4FIELD QUALITY CONTROL
 
          A.Manufacturer's representative shall provide a comprehensive final inspection after completion of the roof system. All application errors shall be addressed and final punch list completed.
 
          3.5PROTECTION
 
          A.Protect installed roofing products from construction operations until completion of project.
 
          B.Where traffic must continue over completed roofing membrane, protect from damage using durable materials that are not incompatible with membrane.
 
          C.Repair or replace damaged products before Substantial Completion.
 
         
END OF SECTION