Section 07552 - Sbs-Modified Bituminous Membrane Roofing

Section 07552 - Sbs-Modified Bituminous Membrane Roofing

DaimlerChryslerChrysler LLCConstruction Standards

Revised 12/12/05

SECTION 07552 - SBS-MODIFIED BITUMINOUS MEMBRANE ROOFING

PART 1 - GENERAL

1.1SUMMARY

  1. This Section includes the following:
  2. Two-ply, modified bituminous membrane roofing.
  3. Roofing insulation.
  4. Related Sections include the following:
  5. Division6 Section "Miscellaneous Carpentry" for wood blocking, curbs, cants, and nailers.
  6. Division7 Section "Sheet Metal Flashing and Trim" for metal roof penetration flashings, flashings, and counterflashings.
  7. Division15 Section "Plumbing Specialties" for roof drains.

1.2DEFINITIONS

  1. Roofing Terminology: Refer to ASTMD1079 for definitions of terms related to roofing work not otherwise defined in this Section.
  2. Hot Roofing Asphalt: Roofing asphalt heated to its equiviscous temperature, the temperature at which its viscosity is 125 centipoise for mop-applied roofing asphalt and 75 centipoise for mechanical spreader-applied roofing asphalt within a range of plus or minus 25degF measured at the mop cart or mechanical spreader immediately before application.

1.3PERFORMANCE REQUIREMENTS

  1. General: Install a watertight, modified bituminous membrane roofing and base flashing system with compatible components that will not permit the passage of liquid water and will withstand wind loads, thermally induced movement, and exposure to weather without failure.
  2. FM Listing: Provide modified bituminous membrane, base flashings, and component materials that meet requirements of FM4450 and FM4470 as part of a roofing system and that are listed in FM's "Approval Guide" for Class1 or noncombustible construction, as applicable. Identify materials with FM markings.
  3. Roofing system shall comply with the following:
  4. Fire/Windstorm Classification: Class1A-90.

1.4SUBMITTALS

  1. Product Data: For each type of roofing product specified. Include data substantiating that materials comply with requirements.
  2. Shop Drawings: Include plans, sections, details, and attachments to other work, for the following:
  3. Base flashings, cants, and membrane terminations.
  4. Tapered insulation, including slopes.
  5. Crickets, saddles, and tapered edge strips, including slopes.
  6. Installer Certificates: Signed by roofing system manufacturer certifying that Installer is approved, authorized, or licensed by manufacturer to install specified roofing system and is eligible to receive the standard roofing manufacturer's warranty.
  7. Manufacturer Certificates: Signed by roofing system manufacturer certifying that the roofing system complies with requirements specified in the "Performance Requirements" Article. Upon request, submit evidence of complying with requirements.
  8. Qualification Data: For firms and persons specified in the "Quality Assurance" Article to demonstrate their capabilities and experience. Include lists of completed projects with project names and addresses, names and addresses of architects and owners, and other information specified.
  9. Research/Evaluation Reports: Evidence of roofing system's compliance with building code in effect for Project from a model code organization acceptable to authorities having jurisdiction.
  10. Maintenance Data: For roofing system to include in the maintenance manuals.
  11. Warranty: Sample copy of standard roofing manufacturer's warranty stating obligations, remedies, limitations, and exclusions of warranty.
  12. Inspection Report: Copy of roofing system manufacturer's inspection report of completed roof installation.

1.5QUALITY ASSURANCE

  1. Installer Qualifications: Engage an experienced installer to perform Work of this Section who has specialized in installing roofing similar to that required for this Project; who is approved, authorized, or licensed by the roofing system manufacturer to install manufacturer's product; and who is eligible to receive the standard roofing manufacturer's warranty.
  2. Fire-Test-Response Characteristics: Provide roofing materials with the fire-test-response characteristics indicated as determined by testing identical products per test method indicated below by UL, FM, or another testing and inspecting agency acceptable to authorities having jurisdiction. Identify materials with appropriate markings of applicable testing and inspecting agency.
  3. Exterior Fire-Test Exposure: ClassA; complying with ASTME108, for application and slopes indicated.
  4. Preliminary Roofing Conference: Before starting roof deck construction, conduct conference at Project site. Meet with the same participants and review the same items listed for the preinstallation conference. In addition, review status of submittals and coordination of work related to roof construction. Notify participants at least 5 working days before conference.
  5. Preinstallation Conference: Before installing roofing system, conduct conference at Project site. Notify participants at least 5 working days before conference.
  6. Meet with Owner; Architect/Engineer; Owner's insurer, if applicable; testing and inspecting agency representative; roofing Installer; roofing system manufacturer's representative; deck Installer; and installers whose work interfaces with or affects roofing, including installers of roof accessories and roof-mounted equipment.
  7. Review methods and procedures related to roofing installation, including manufacturer's written instructions.
  8. Examine deck substrate conditions and finishes for compliance with requirements, including flatness and attachment to structural members.
  9. Review loading limitations of deck during and after roofing.
  10. Review flashings, special roofing details, roof drainage, roof penetrations, equipment curbs, and condition of other construction that will affect roofing.
  11. Review governing regulations and requirements for insurance, certifications, and inspection and testing, if applicable.
  12. Review temporary protection requirements for roofing system during and after installation.
  13. Review roof observation and repair procedures after roofing installation.
  14. Document proceedings, including corrective measures or actions required, and furnish copy of record to each participant.

1.6DELIVERY, STORAGE, AND HANDLING

  1. Store roofing materials in a dry, well-ventilated, weathertight location to ensure no significant moisture pickup and maintain at a temperature exceeding roofing system manufacturer's written instructions. Store rolls of felt and other sheet materials on end on pallets or other raised surfaces. Do not double-stack rolls.
  2. Handle and store roofing materials and place equipment in a manner to avoid significant or permanent damage to deck or structural supporting members.
  3. Do not leave unused felts and other sheet materials on the roof overnight or when roofing work is not in progress unless protected from weather and moisture and unless maintained at a temperature exceeding 50degF.
  4. Deliver and store liquid materials in their original undamaged containers in a clean, dry, protected location and within the temperature range required by roofing system manufacturer.
  5. Protect roofing 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.

1.7PROJECT CONDITIONS

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

1.8WARRANTY

  1. General Warranty: The warranties specified in this Article shall not deprive the Owner of other rights the Owner may have under other provisions of the Contract Documents and shall be in addition to, and run concurrent with, other warranties made by the Contractor under requirements of the Contract Documents.
  2. Standard Roofing Manufacturer's Warranty: Submit a written warranty, without monetary limitation, signed by roofing system manufacturer agreeing to promptly repair leaks in the roof membrane and base flashings resulting from defects in materials or workmanship for a period of 12 years.

PART 2 - PRODUCTS

2.1MANUFACTURERS

  1. Manufacturers: Unless otherwise directed by the Owner, provide products by one of the following:
  2. SBS-Modified Bituminous Sheet:
  3. Soprema Roofing and Waterproofing, Inc.
  4. GAF
  5. JohnsManville
  6. Polyisocyanurate Board Insulation: As manufactured, distributed or approved by the membrane manufacturer.

2.2SBS-MODIFIED BITUMINOUS SHEET

  1. SBS-Modified Bituminous Sheet, Smooth Surfaced: SBS-modified asphalt sheet, smooth surfaced; suitable for application method specified; manufacturer's standard thickness and weight; for use and of reinforcing type as follows:
  2. Use: Base flashing.
  3. Reinforcing: Nonwoven polyester.
  4. Approximate Thickness: 90 mils
  5. Installation Method: Torch.
  6. Product: Soprema "ELASTOPHENE 180 PS (24)".
  7. Use: Base ply of 2-ply, modified bituminous membrane roofing.
  8. Reinforcing: Nonwoven glass-fiber mat.
  9. Approximate Thickness: 90 mils.
  10. Installation Method: Hot mop asphalt.
  11. Product: Soprema ELASTOPHENE SANDED (25)".
  12. SBS-Modified Bituminous Sheet, Mineral-Granule Surfaced: SBS-modified asphalt sheet, with continuous layer of mineral granules factory applied to top exposed surface; suitable for application method specified; manufacturer's standard thickness and weight; for use and of reinforcing type and granule color as follows:
  13. Use: Finish ply of base flashing.
  14. Reinforcing: Nonwoven polyester.
  15. Approximate Thickness: 160 mils.
  16. Installation Method: Torch.
  17. Product: Soprema "SOPRALENE FLAM 180 GRANULES (50)".
  18. Use: Finish ply of 2-ply, modified bituminous membrane roofing.
  19. Reinforcing: Glass-fiber mesh or nonwoven glass-fiber mat.
  20. Approximate Thickness: 136 mils.
  21. Installation Method: Hot mop asphalt.
  22. Product: Soprema "ELASTOPHENE FR GRANULES (42)".
  23. Granule Color: White.

2.3AUXILIARY MEMBRANE MATERIALS

  1. General: Furnish auxiliary materials recommended by roofing system manufacturer for intended use and compatible with SBS-modified bituminous roofing.
  2. Furnish liquid-type auxiliary materials that meet VOC limits of authorities having jurisdiction.
  3. Roofing Asphalt: ASTMD312, TypeIII or TypeIV, as recommended by modified bituminous membrane manufacturer.
  4. Label each container or provide certification with each load of bulk asphalt identifying type of roofing asphalt and indicating softening point, minimum flash point, equiviscous temperature, and finished blowing temperature.
  5. Mastic Sealant: Polyisobutylene, plain or modified bituminous, nonhardening, nonmigrating, nonskinning, and nondrying.
  6. Fasteners: Factory-coated steel fasteners and metal or plastic plates complying with corrosion-resistance provisions of FM4470; designed for fastening base sheets, base-ply felts, and base flashings and for backnailing modified bituminous membrane to substrate; tested by manufacturer for required pullout strength; and acceptable to roofing system manufacturer.
  7. Metal Flashing Sheet: Metal flashing sheet is specified in Division7 Section "Sheet Metal Flashing and Trim."
  8. Wood Nailer Strips: Furnish wood nailer strips complying with requirements of Division6 Section "Miscellaneous Carpentry."
  9. Cants: Cellulosic-fiber board, complying with ASTMC208, Type2.
  10. Roofing Granules: Ceramic-coated roofing granules, No.11 screen size with 100 percent passing No.8 sieve and 98 percent of mass retained on No.40 sieve.
  11. Color: To match color of cap sheet.
  12. Miscellaneous Accessories: Provide miscellaneous accessories recommended by roofing system manufacturer for intended use.

2.4INSULATION MATERIALS

  1. General: Provide preformed, roofing insulation boards that comply with requirements, selected from manufacturer's standard sizes and of thicknesses indicated.
  2. Provide preformed, tapered insulation boards where indicated for sloping to drain. Fabricate with the following taper:
  3. As indicated on Drawings.
  4. Provide preformed saddles, crickets, tapered edge strips, and other insulation shapes where indicated for sloping to drain. Fabricate to slopes indicated.
  5. Nominal insulation thickness:
  6. Production areas: 1.5 inch
  7. Nonproduction areas: 2.5 inches
  8. Polyisocyanurate Board Insulation: ASTMC1289, classified by facer TypeII, felt or glass-fiber mat on both major surfaces.
  9. Compressive Strength (ASTMD1621, 1 inch thick): 20 psi minimum.
  10. Density (ASTMD1622): 1.5 pcf minimum.

2.5INSULATION ACCESSORIES

  1. General: Furnish roofing insulation accessories recommended by insulation manufacturer for intended use and compatible with sheet roofing material.
  2. Fasteners: Factory-coated steel fasteners and metal or plastic plates complying with corrosion-resistance provisions of FM4470, designed for fastening roofing insulation to substrate, tested by manufacturer for required pullout strength, and acceptable to roofing system manufacturer.
  3. Cover Board: Rigid, cellulosic-fiber insulation board, complying with ASTMC208, TypeII, Grade2, 1/2 inch thick.

PART 3 - EXECUTION

3.1EXAMINATION

  1. Examine substrates, areas, and conditions under which roofing will be applied, with Installer present, for compliance with requirements.
  2. Verify that roof openings and penetrations are in place and set and braced and that roof drains are properly clamped into position.
  3. Verify that wood blocking, curbs, and nailers are securely anchored to roof deck at roof penetrations and terminations and match the thicknesses of insulation required.
  4. Verify that wood nailer strips are located perpendicular to roof slope and are spaced according to requirements of roofing system manufacturer.
  5. Verify that flatness and fastening of metal roof decks comply with tolerances and conditions acceptable to roof membrane manufacturer.
  6. Do not proceed with installation until unsatisfactory conditions have been corrected.

3.2PREPARATION

  1. Clean substrate of dust, debris, and other substances detrimental to roofing installation according to roofing system manufacturer's written instructions. Remove sharp projections.
  2. 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.

3.3GENERAL INSTALLATION REQUIREMENTS

  1. Install modified bituminous membrane roofing system according to roofing system manufacturer's written instructions and applicable recommendations of NRCA/ARMA's "Quality Control Recommendations for Polymer Modified Bitumen Roofing."
  2. Install roofing system according to applicable specification plates of NRCA's "The NRCA Roofing and Waterproofing Manual."
  3. Start installation of modified bituminous membrane roofing in presence of roofing system manufacturer's technical personnel.
  4. Shingling Plies: Install modified bituminous membrane roofing system with ply sheets shingled uniformly to achieve required number of membrane plies throughout. Shingle in direction to shed water.
  5. Where roof slope exceeds 1/2 inch per 12 inches, run sheets of modified bituminous membrane roofing parallel with slope. Backnail top ends of sheets to nailer strips.
  6. Cant Strips: Install and secure preformed 45-degree cant strips at junctures of modified bituminous membrane roofing system with vertical surfaces or angle changes greater than 45 degrees.
  7. Coordinate installing roofing system components so insulation and roofing plies are not exposed to precipitation or left exposed at the end of the workday or when rain is forecast.
  8. Provide cutoffs at end of each day's work to cover exposed ply sheets and insulation with a course of coated felt with joints and edges sealed.
  9. Complete terminations and base flashings and provide temporary seals to prevent water from entering completed sections of roofing system.
  10. Remove and discard temporary seals before beginning work on adjoining roofing.
  11. Asphalt Heating: Heat roofing asphalt and apply within plus or minus 25degF of equiviscous temperature, unless otherwise required by roofing system manufacturer. Do not raise roofing asphalt temperature above the equiviscous temperature range more than one hour before time of application. Do not exceed roofing asphalt manufacturer's recommended temperature limits during roofing asphalt heating. Do not heat roofing asphalt within 25degF of flash point. Discard roofing asphalt maintained at a temperature exceeding 500degF for more than 4 hours. Keep kettle lid closed, unless adding roofing asphalt.
  12. Substrate-Joint Penetrations: Prevent roofing asphalt from penetrating substrate joints, entering building, or damaging roofing system components or adjacent building construction. If mopping is applied directly to substrate, tape substrate joints.

3.4INSULATION INSTALLATION

  1. Coordinate installing roofing system components so insulation is not exposed to precipitation or left exposed at the end of the workday.
  2. Comply with roofing system manufacturer's written instructions for installing roofing insulation.
  3. Install tapered insulation under area of roofing to conform to slopes indicated and to Shop Drawings.
  4. Install tapered edge strips at perimeter edges of roof that do not terminate at vertical surfaces.
  5. Install one layer of insulation under area of roofing for nominal total thickness of 11/2 inches. Trim surface of insulation where necessary at roof drains so completed surface is flush with ring of drain.
  6. Install insulation to equipment curbs not insulated by the manufacturer. Secure to curb using appropriate mechanical fasteners.
  7. Nailer Strips: Where roof slopes are greater than 1/2 inch per 12 inches, mechanically fasten to deck 4-inch nominal- wide, wood nailer strips of same thickness as insulation, spaced not more than 20 to 21 feet apart. Run nailers perpendicular to slope of roof.
  8. Install insulation with long joints of insulation in continuous straight lines with end joints staggered between rows, abutting edges and ends between boards. Fill gaps exceeding 1/4 inch with insulation.
  9. Cut and fit insulation within 1/4 inch of nailers, projections, and penetrations.
  10. Attached Insulation: Secure to deck using mechanical fasteners specifically designed and sized for fastening specified board-type roofing insulation to deck type indicated.
  11. Fasten insulation according to the insulation and roofing system manufacturers' written instructions to meet specified wind-uplift requirements, but not less than 1 fastener for each 4 sq. ft. and at least 2 fasteners per board.
  12. Install cover boards over insulation with long joints in continuous straight lines with end joints staggered between rows. Tightly butt cover boards together and adhere to insulation in a mopping of hot asphalt in compliance with roofing system manufacturer's written instructions.

3.5ROOF MEMBRANE INSTALLATION

  1. General: Install modified bituminous membrane over area to receive roofing, according to manufacturer's written instructions. Extend modified bituminous membrane over and terminate beyond cants.
  2. Unroll sheet and allow it to relax for the minimum time period required by manufacturer.
  3. Two-Ply, Modified Bituminous Membrane: Install 2 plies of modified bituminous membrane, consisting of a base ply and a finish ply, starting at low point of roofing system.
  4. Flashing Base- and Finish-Ply Application: Torch apply each ply to substrate.
  5. Field Areas Base- and Finish-Ply Application: Adhere each ply to substrate in a solid mopping of hot roofing asphalt applied at rate required by roofing system manufacturer.
  6. Laps: Accurately align sheets, without stretching, and maintain uniform side and end laps. Stagger end laps. Completely bond and seal laps, leaving no voids.
  7. Repair tears and voids in laps and lapped seams not completely sealed.
  8. Apply granules, while asphalt is hot, to cover asphalt bead exuded at laps.
  9. Install modified bituminous membranes with side laps shingled with slope of roof deck where possible.
  10. Install modified bituminous membranes with side laps shingled in direction to shed water on each large area of roofing, where slope exceeds 1/2 inch per 12 inches.

3.6FLASHING AND STRIPPING INSTALLATION

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