Attachment_12-_SPEc_section_075216.pdf

SECTION 075216

STYRENE-BUTADIENE-STYRENE (SBS) MODIFIED BITUMINOUS MEMBRANE ROOFING

PART 1 - GENERAL

1.1 SECTION INCLUDES

A. Replacement patching of existing poured gypsum roof deck.

B. SBS-modified bituminous membrane roofing.

C. Cover board.

D. Roof insulation.

E. Base sheet.

1.2 REFERENCES

A. Roofing Terminology: Refer to the following publications (current editions) for definitions of roofing work related terms used in this Section:

1. ASTM D 1079 “Terminology Relating to Roofing and Waterproofing.”

2. Glossary of NRCA's "The NRCA Roofing Manual."

3. Roof Consultants Institute “Glossary of Roofing Terms.”

B. Deck Replacement Work: Refer to NRDCA 500 “Gypsum Roof Deck Replacement Procedures” for patching work at existing poured gypsum deck.

C. Safety Protocol: Refer to USACE EM 385-1-1 “Safety and Health Requirements Manual” for safety practices and procedures to follow for roofing work. Comply with all applicable OSHA safety requirements.

D. Sheet Metal Terminology and Techniques: SMACNA “Architectural Sheet Metal Manual.”

E. Hot Roofing Asphalt: Roofing asphalt heated to temperature recommended by roofing manufacturer to flux modified roofing membrane, measured at the mop cart or mechanical spreader immediately before application.

1.3 DESIGN CRITERIA

A. General: Installed roofing membrane system shall remain watertight; and resist specified wind uplift pressures, thermally induced movement, and exposure to weather without failure.

B. Material Compatibility: Roofing materials shall be compatible with one another under conditions of service and application required, as demonstrated by roofing system manufacturer based on testing and field experience.

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C. Wind Uplift Performance: Roofing system shall be identical to systems that have been successfully tested by a qualified testing and inspecting agency to resist wind uplift pressure calculated in accordance with

ASCE 7-10.

1. System Basis of Design per FBC FL2948-R11:

1) Evaluation Report: J8230.03.08-R10

2) System #: G-13

3) Maximum Design Pressure (MDP): -45.0* pounds per square foot

1.4 SUBMITTALS

A. Product Data (GA): Manufacturer’s data sheets for each product to be provided.

B. Detail Drawings (GA): Provide roofing system plans, elevations, sections, details, and details attachment to other Work, including:

1. Base flashings, cants, and membrane terminations.

2. Tapered insulation, including slopes.

3. Crickets, saddles, and tapered edge strips, including slopes.

4. Insulation fastening patterns.

5. Roof caps, roof drains, and vents-through-roof.

C. Verification Samples (GA): Provide for each product specified.

D. Contractor’s Safety Plan (GA): Include safety provisions for roof work.

E. Maintenance Data (GA): Refer to roofing manufacturer’s latest published documents.

F. Guarantees (FIO): Provide manufacturer’s current guarantee specimen.

G. Provide four copies of above-mentioned submittals to the Contracting Officer.

1.5 QUALITY ASSURANCE

A. 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 the specified manufacturer's guarantee. Provide four copies of certificate (FIO) to Contracting Officer.

B. Manufacturer Qualifications: Qualified manufacturer that has a UL listing for roofing system identical to that used for this project.

C. Testing Agency Qualifications: An independent testing agency with the experience and capability to conduct the testing indicated, as documented according to ASTM E 329.

D. Test Reports:

1. Roof drain and leader test or submit plumber’s verification.

2. Roof deck fastener pullout test.

3. Moisture survey to determine high levels of moisture at existing poured gypsum deck.

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4. Visual survey of deck underside for sagging or broken formboard and areas of moisture staining and wetness

E. Source Limitations: Obtain all components from the single source roofing system manufacturer guaranteeing the roofing system. All products used in the system shall be labeled by the single source roofing manufacturer issuing the guarantee.

F. Provide evidence of CERTA training for any installer of torch-applied modified bitumen membrane. Submit four copies of certifications (FIO) to Contracting Officer prior to award; one copy must be maintained on the jobsite for inspection at any time.

G. Fire-Test-Response Characteristics: Roofing materials shall comply with the fire-test-response characteristics indicated as determined by testing identical products per test method below by UL or another testing and inspecting agency acceptable to authorities having jurisdiction. Materials shall be identified with appropriate markings of applicable testing and inspecting agency.

1. Exterior Fire-Test Exposure: Class A; ASTM E 108, for application and roof slopes indicated.

2. Fire-Resistance Ratings: ASTM E 119, for fire-resistance-rated roof assemblies of which roofing system is a part.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Deliver roofing materials in original containers with seals unbroken and labeled with manufacturer's name, product brand name and type, date of manufacture, and directions for storage.

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.

C. Protect roof insulation materials from physical damage and from deterioration by sunlight, moisture, soiling, and other sources. 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.

1.7 PROJECT CONDITIONS

A. Weather Limitations: Proceed with installation only when current and forecasted weather conditions permit roofing system to be installed in accordance with manufacturer's written instructions and guarantee requirements.

B. All roof replacement work shall be performed in accordance with USACE EM 385-1-1 and the Contractor’s Safety Plan, as approved by the Government.

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1.8 GUARANTEE

A. Provide manufacturer's system guarantee equal to roof manufacturer's No Dollar Limit Roofing System Guarantee.

1. Single-Source special guarantee includes roofing plies, base flashings, liquid applied flashing, roofing membrane accessories, granule surfaced roofing membrane, roof insulation, fasteners, cover board, manufacturer’s edge metal products, and other single-source components of roofing system marketed by the manufacturer.

2. Guarantee Period: 20 years from date of Substantial Completion.

B. Installer’s Guarantee: Submit roofing Installer's guarantee, signed by Installer, covering Work of this Section, including all components of roofing system, for the following guarantee period:

1. Guarantee Period: Two Years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 BASE PLY AND CAP-SHEET MATERIALS

A. Roofing Membrane Cap Sheet: ASTM D 6163, Grade G, Type I, glass-fiber-reinforced, SBS-modified asphalt sheet; granular surfaced; suitable for application method specified. Basis of Design: Johns Manville DynaGlas FR or approved equal.

2.2 SHEET MATERIALS

A. Glass-Fiber Base Sheet: ASTM D4601, Type II, asphalt coated, fiberglass base felt. Basis of Design:

Johns Manville PermaPly 28 or approved equal.

B. Base-Sheet Fasteners: Tube, disk and locking staple design, factory-coated steel fasteners and Galvalume metal battens meeting corrosion-resistance provisions in FMG 4470, designed for fastening base-sheet to substrate, tested by manufacturer for required pullout strength, and provided by the roofing system manufacturer. Product: Johns Manville UltraLok Locking Impact Fastener or approved equal.

2.2 FLASHING SHEET MATERIALS

A. Flashing Sheet: SBS-modified asphalt sheet; suitable for application method specified. Basis of Design:

Johns Manville DynaClad or approved equal.

B. Liquid Applied Flashing: A liquid and fabric reinforced flashing system created with a stitch bonded polyester scrim and a two-component, moisture cured, elastomeric, liquid applied flashing material, consisting of an asphalt extended urethane base material and an activator. Basis of Design: Johns Manville PermaFlash System or approved equal.

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2.3 AUXILIARY ROOFING MATERIALS

A. General: Auxiliary materials recommended by roofing system manufacturer for intended use and compatible with built-up roofing.

B. Roofing Asphalt: ASTM D 312, Type IV.

C. Asphalt Primer: ASTM D 41. Basis of Design: Johns Manville Asphalt Primer or approved equal.

D. Cold-Applied Flashing Adhesive: Roofing system manufacturer's asphalt-based, two-component, asbestos-free, trowel-grade, cold-applied adhesive specially formulated for compatibility and use with flashing applications. Basis of Design: Johns Manville MBR Utility Cement or approved equal.

E. Mastic Sealant: As required by roofing manufacturer and to provide complete installation.

F. Fasteners: Factory-coated steel fasteners and metal or plastic plates meeting corrosion-resistance provisions in FMG 4470, designed for fastening roofing membrane components to substrate, tested by manufacturer for required pullout strength, and provided by the roofing system manufacturer. Basis of Design: Johns Manville All Purpose Fasteners and Plates or approved equal.

G. Roofing Granules: Ceramic-coated roofing granules matching specified cap sheet, provided by roofing system manufacturer; Johns Manville CR Roofing Granules or approved equal.

H. Miscellaneous Accessories: Provide miscellaneous accessories recommended by roofing system manufacturer.

2.4 COVER BOARD

A. Perlite Board: ASTM C 728, Type 1; composed of expanded perlite, cellulosic fibers, binders and waterproofing agents with top surface seal-coated. Basis of Design: Johns Manville ¾” Fesco Board or approved equal.

2.5 ROOF INSULATION

A. General: Provide preformed roof insulation boards that comply with requirements and referenced standards, selected from manufacturer's standard sizes and of thicknesses indicated.

B. Polyisocyanurate Board Insulation: ASTM C 1289, Type II, Class 1, Grade 3 (25 psi), Basis of Design:

Johns Manville ENRGY 3 or approved equal.

1. Provide insulation package with minimum thickness: 5 inches

2. Provide insulation package in multiple layers.

a. Two layers, each 2.5 inches thick.

3. Minimum Long-Term Thermal Resistance (LTTR): 5.7 per inch

a. Determined in accordance with CAN/ULC S770 at 75ºF (24ºC)

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2.6 INSULATION ACCESSORIES

A. General: Roof insulation accessories recommended by insulation manufacturer for intended use and compatible with membrane roofing.

B. Provide factory preformed saddles, crickets, tapered edge strips, and other insulation shapes where indicated and as required for sloping to drain. Fabricate to slopes indicated. Basis of Design: Johns Manville DiamondBack Pre-cut Crickets, DiamondBack Pre-Cut Miters, Tapered Fesco Edge Strip, and Tapered ENRGY 3 or approved equals.

C. Fasteners: Factory-coated steel fasteners and metal or plastic plates meeting corrosion-resistance provisions in FMG 4470, designed for fastening roof insulation to substrate, and furnished by roofing system manufacturer. Basis of Design: Johns Manville UltraFast Fasteners and Plates or approved equal.

D. Insulation Cant Strips: ASTM C 728, perlite insulation board (unless indicated on drawings to be wood).

Basis of Design: Johns Manville FesCant Plus or approved equal.

E. Wood Nailer Strips: As indicated on drawings.

2.7 AUXILIARY ROOFING SYSTEM COMPONENTS

A. Coping System: Reuse existing coping as indicated on drawings. Provide new joint covers (material and color to match existing coping caps); set joint covers in clear mastic.

B. Metal Flashing and Edge Trim: Metal flashing and edge trim as indicated on drawings.

C. Roof Drain: Aluminum “fast flow” retrofit/reroof drain set for single ply roofing; pipe sizes as indicated on drawings; 10-inch cast iron dome strainer, metal clamping ring, 12-inch stem, 16-inch spun 0.081” heavy gage aluminum base (drain flange) and expanding seal for anti-back-up.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates, areas, and conditions for compliance with the requirements affecting performance of roofing system.

1. General:

a. Verify that roof openings and penetrations are in place and set and braced and that roof drains are securely clamped in place.

b. Verify that wood cants, blocking, curbs, and nailers are securely anchored to roof deck at penetrations and terminations and that nailers match thicknesses of insulation.

2. Inspect poured gypsum deck closely for:

a. Excessive deflection of bulb tees,

b. Staining of form board,

c. Cracking, FA4608-17-R-0023

d. Evidence of excessive moisture.

3. Ensure general rigidity and proper slope for drainage.

4. Verify that deck is securely fastened with no projecting fasteners and with no adjacent units in excess of 1/16 inch out of plane relative to adjoining deck.

B. Unacceptable panels should be brought to the attention of the General Contractor and Contracting Officer’s Representative and must be corrected prior to installation of roofing system.

C. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 PREPARATION

A. Clean and remove from substrate sharp projections, dust, debris, moisture, and other substances detrimental to roofing system installation in accordance with roofing system manufacturer's written instructions.

B. Prevent materials from entering and clogging roof drains and conductors and from spilling or migrating onto surfaces of other construction.

C. If applicable, prime surface of deck with asphalt primer at a rate recommended by roofing manufacturer and allow primer to dry.

D. Proceed with installation only after unsatisfactory conditions have been corrected.

3.3 RE-ROOF PREPARATION

A. Provide replacement patches where the existing poured gypsum roof deck is damaged to the point of instability or where roof mounted appurtenances have been abandoned or are being removed (and not replaced) under this contract. Follow the following procedure to perform poured gypsum deck replacement:

1. Remove existing gypsum fill from inside one complete forrnboard panel. Cut the wire mesh and remove both the wire mesh and the formboard. Leave at least a three-inch length of wire mesh next to the existing bulb tees (this length of wire is absolutely required to tie in the new wire mesh after reinstalling the new formboard).

2. Replace existing formboards with new 6-pound minimum density gypsum board sprayed on both sides with Clorox; or minimum 1-inch thick fiberglass formboard. Install galvanized cross tees at the end of formboards that do not fall on existing joists for support.

3. Tie new galvanized wire mesh (Keydeck 2160-2-1619 or approved equal) into the existing three-inch mesh at each bulb tee. Do not leave out the wire mesh (wire mesh provides structural reinforcement for the new panel and the adjacent panels; without the wire mesh, a worker could fall through the adjacent panel).

4. Use gypsum slurry product (United States Gypsum Pyrofill gypsum or approved equal); this product comes in an 80 pound bag and is to be mixed with 6 to 7 gallons of water. Install the formboards. Place

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gypsum slurry on all flanges of existing bulb tees and cross tees. Add a 2-inch wide line of gypsum across the diagonals of each formboard. After the slurry and the diagonal pattern of gypsum have set, mix a new bag of gypsum slurry product with water as described above. Gypsum should set in approximately 30 to 60 minutes. Slowly place the wet mix of gypsum onto the new formboard and screed off to the desired thickness. Always maintain a minimum gypsum placement of 2-inches above the formboard.

5. New roofing operations may begin as soon as the gypsum has set. Attach the base sheet to the gypsum with fasteners designed for this application.

B. Remove all roofing membrane, surfacing, cover boards, insulation, fasteners, asphalt, pitch, adhesives, etc.

1. Remove an area no larger than can be re-roofed in one day.

C. Tear out all base flashings, counter-flashings, pitch pans, pipe flashings, vent boots, and like components necessary for application of new membrane.

D. Remove abandoned equipment curbs and other like penetrations.

1. Perform partial deck replacement (to match existing) as described above and as directed by the Contracting Officer.

E. Disconnect as required (disconnect by licensed craftsmen) all units and other equipment items that are supported by curbs and raise as indicated on drawings to conform with the following:

1. Extend curbs as indicated on drawings to provide a minimum 8" base flashing height measured from the surface of the new membrane to the top of the flashing membrane.

2. Secure of flashing and install new metal counterflashing prior to re-installation of unit.

3. New perimeter wood nailer assemblies must be provided to match elevation of new roof insulation.

F. Immediately remove all debris from roof surface and dispose of in accordance with local, state, and federal laws and regulations. Demolished roof system may not be stored on the roof surface.

G. Proceed with installation only after unsatisfactory conditions have been corrected.

3.4 BASE-SHEET INSTALLATION

A. Install one lapped base sheet course and mechanically fasten to substrate according to roofing system manufacturer's written instructions.

1. Enhance fastening rate in perimeter and corner zones according to code or manufacturer, whichever is more stringent.

B. Comply with roofing system manufacturer's written instructions for installing roof insulation.

C. Proceed with installation only after unsatisfactory conditions have been corrected.

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3.5 INSULATION INSTALLATION

A. Coordinate installation of roof system components so insulation and cover board is not exposed to precipitation or left exposed at the end of the workday.

B. Comply with roofing system manufacturer's written instructions for installation of roof insulation.

C. Insulation Cant Strips: Install and secure preformed 45-degree insulation cant strips at junctures of roofing membrane system with vertical surfaces or angle changes greater than 45 degrees per manufacturer’s instruction.

D. Install tapered insulation under area of roofing to conform to slopes indicated.

E. Install insulation boards with long joints in a continuous straight line with end joints staggered between rows, abutting edges and ends between boards. Fill gaps exceeding 1/4 inch with like material.

F. Install 2 or more layers with joints of each succeeding layer staggered from joints of previous layer a minimum of 6 inches in each direction.

G. Trim surface of insulation boards where necessary at roof drains so completed surface is flush and does not restrict flow of water.

H. Install tapered edge strips at perimeter edges of roof that do not terminate at vertical surfaces.

I. Adhered Insulation: Install each layer of insulation and adhere to substrate as follows:

1. Install each layer in a solid mopping of hot roofing asphalt according to roofing system manufacturer’s instruction.

2. Install each layer to resist uplift pressure at corners, perimeter, and field of roof.

J. Proceed with installation only after unsatisfactory conditions have been corrected.

3.6 COVER BOARD INSTALLATION

A. Coordinate installing membrane roofing system components so cover board is not exposed to precipitation or left exposed at the end of the workday.

B. Comply with membrane roofing system manufacturer's written instructions for installing roof cover board.

C. Install cover board with long joints of cover board in a continuous straight line with end joints staggered between rows, abutting edges and ends between boards. Fill gaps exceeding 1/4 inch with cover board.

1. Cut and fit cover board within 1/4 inch of nailers, projections, and penetrations.

D. Trim surface of cover board where necessary at roof drains so completed surface is flush and does not restrict flow of water.

1. Install tapered edge strips at perimeter edges of roof that do not terminate at vertical surfaces.

E. Adhered Cover Board: Adhere cover board to substrate as follows:

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1. Install in a solid mopping of hot roofing asphalt according to roofing system manufacturer’s instruction.

F. Proceed with installation only after unsatisfactory conditions have been corrected.

3.7 ROOFING MEMBRANE INSTALLATION, GENERAL

A. Install roofing membrane in accordance with roofing system manufacturer's written instructions, applicable recommendations of the roofing manufacturer, and requirements in this Section.

B. Start installation of roofing membrane in presence of roofing system manufacturer's technical personnel.

C. Where roof slope exceeds 1/2 inch per 12 inches (1:24), contact the membrane manufacturer for installation instructions regarding installation direction and backnailing

D. Cooperate with testing and inspecting agencies engaged or required to perform services for installing roofing system.

E. Coordinate installing roofing system so insulation and other components of the roofing membrane system not permanently exposed are not subjected to precipitation or left uncovered at the end of the workday or when rain is imminent.

1. Provide tie-offs at end of each day's work to cover exposed roofing membrane sheets and insulation with a course of coated felt set in roofing cement or hot roofing asphalt with joints and edges sealed.

2. Complete terminations and base flashings and provide temporary seals to prevent water from entering completed sections of roofing system.

3. Remove and discard temporary seals before beginning work on adjoining roofing.

F. Asphalt Heating: Heat roofing asphalt to temperature recommended by roofing manufacturer to flux modified membrane. Do not exceed roofing asphalt manufacturer's recommended temperature limits during roofing asphalt heating. Discard roofing asphalt maintained at a temperature exceeding finished blowing temperature for more than 4 hours.

G. Substrate-Joint Penetrations: Prevent roofing asphalt from penetrating substrate joints, entering building, or damaging roofing system components or adjacent building construction.

H. Proceed with installation only after unsatisfactory conditions have been corrected.

3.8 SBS-MODIFIED BITUMINOUS MEMBRANE INSTALLATION

A. Install one modified bituminous roofing membrane sheet and cap sheet according to roofing manufacturer's written instructions, starting at low point of roofing system. Extend roofing membrane sheets over and terminate beyond cants, with the following installing methods:

1. Unroll roofing membrane sheets and allow them to relax for minimum time period required by manufacturer.

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2. Adhere to substrate in a solid mopping of hot roofing asphalt applied at temperatures recommended by roofing system manufacturer.

B. Laps: Accurately align roofing membrane sheets, without stretching, and maintain uniform side and end laps. Stagger end laps. Completely bond and seal laps, leaving no voids.

1. Repair tears and voids in laps and lapped seams not completely sealed.

2. Apply roofing granules to cover exuded bead at laps while bead is hot.

C. Install roofing membrane sheets so side and end laps shed water.

D. Proceed with installation only after unsatisfactory conditions have been corrected.

3.9 FLASHING AND STRIPPING INSTALLATION

A. Install base flashing over cant strips and other sloping and vertical surfaces, at roof edges, and at penetrations through roof, and secure to substrates according to roofing system manufacturer's written instructions and as follows:

1. Prime substrates with asphalt primer if required by roofing system manufacturer.

2. Flashing Sheet Application: Torch apply flashing sheet to substrate as required by roofing system manufacturer.

B. Extend base flashing up walls or parapets a minimum of 8 inches above roofing membrane and 4 inches onto field of roofing membrane.

C. Mechanically fasten top of base flashing securely at terminations and perimeter of roofing.

1. Seal top termination of base flashing with a strip of glass-fiber fabric set in flashing cement.

D. Roof Drains: Flash drain using liquid applied flashing system (Johns Manville PermaFlash or approved equal). Clamp roofing membrane, flashing, and stripping into roof-drain clamping ring.

1. Install stripping according to roofing system manufacturer's written instructions.

E. Flash all penetrations using liquid applied flashing system (Johns Manville PermaFlash or approved equal).

F. Proceed with installation only after unsatisfactory conditions have been corrected.

3.10 ROOF DRAIN INSTALLATION

A. Select size of reroof drains to fit into the existing drain pipe.

B. Install compressed high-density impregnated expanding seal inside the existing drain pipe.

C. Remove restraining tape immediately before installation of reroof drain into the existing pipe to activate the seal to expand; and thus form a permanent elastic watertight seal against the inside of the existing drain pipe to eliminate water back-up.

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D. Mount the flat horizontal flange flush against the roofing (or insulation surface) to prevent damming of water.

E. Install the clamping ring with bolts to securely compress and permanently seal the edge of the new roof membrane.

F. Bolt down dome strainers securely.

3.11 FIELD QUALITY CONTROL

A. Final Roof Inspection: Arrange for roofing system manufacturer’s Registered Roof Observer (RRO) to inspect roofing installation on completion and submit report to Contracting Officer.

B. Repair or remove and replace components of roofing system where test results or inspections indicate that they do not comply with specified requirements.

C. Additional testing and inspecting, at Contractor's expense, will be performed to determine compliance of replaced or additional work with specified requirements.

D. Any surveys, examinations, and testing listed herein or otherwise required shall be done at Contractor’s expense.

3.12 PROTECTION AND CLEANING

A. Protect roofing system from damage and wear during remainder of construction period.

B. Clean overspray and spillage from adjacent construction using cleaning agents and procedures recommended by manufacturer of affected construction.

** END OF SECTION **

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J. Proceed with installation only after unsatisfactory conditions have been corrected.

F. Proceed with installation only after unsatisfactory conditions have been corrected.