12_07_52_16_SBS_Modified_Bituminous_Membrane_Roofing_-_Amendment_0003_0003.pdf

NATIONAL PARK SERVICE

REHABILITATION OF THE EIELSON VISITOR CENTER

DENALI NATIONAL PARK AND PRESERVE, ALASKA

SECTION 07 52 16

STYRENE-BUTADIENE-STYRENE (SBS) MODIFIED

BITUMINOUS MEMBRANE ROOFING

Design Alaska, Inc. 07 52 16- 1

PART 1 GENERAL

1.1 SCOPE: SECTION 07 52 16 - STYRENE-BUTADIENE-STYRENE (SBS) MODIFIED BITUMINOUS

MEMBRANE ROOFING

A. Section Includes:

1. Living roofing system with styrene-butadiene-styrene (SBS) modified bituminous membrane roofing.

2. Substrate board.

3. Conductive primer.

4. Roof insulation.

5. Living roof assembly accessories.

B. Related Requirements:

1. Section 07 41 13.16 - Standing-Seam Metal Roof Panels for metal roofing installed over membrane roofing system.

1.2 PREINSTALLATION MEETINGS

A. Preinstallation Conference: Conduct conference at Project site.

1. Meet with Owner, Architect, Owner's insurer, testing and inspecting agency rep-resentative, 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 methods and procedures related to roofing installation, including manu-facturer's written instructions.

3. Review and finalize construction schedule and verify availability of materials, In-staller's personnel, equipment, and facilities needed to make progress and avoid delays.

4. Examine deck substrate conditions and finishes for compliance with require-ments, including flatness and fastening.

5. Review structural loading limitations of roof deck during and after roofing.

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6. Review base flashings, special roofing details, roof drainage, roof penetrations, equipment curbs, and condition of other construction that will affect roofing sys-tem.

7. Review governing regulations and requirements for insurance and certificates if applicable.

8. Review temporary protection requirements for roofing system during and after installation.

9. Review roof observation and repair procedures after roofing installation.

1.3 SUBMITTALS

A. Action Submittals:

1. Product Data: For each type of product.

2. Shop Drawings: Include plans, sections, details, and attachments to other work, including the following:

a. Base flashings and membrane terminations.

b. Flashing details at penetrations.

c. Tapered insulation, including slopes, layout, and thicknesses.

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

e. Insulation fastening patterns for corner, perimeter, and field-of-roof lo-cations.

f. Tie-in with adjoining air barrier.

B. Informational Submittals:

1. Qualification Data: For qualified Installer and manufacturer.

2. Manufacturer Certificates:

a. Performance Requirement Certificate: Signed by roof membrane manu-facturer certifying that roofing system complies with requirements spec-ified in "Performance Requirements" Article.

b. Special Warranty Certificate: Signed by roof membrane manufacturer, certifying that all materials supplied under this Section are acceptable for special warranty.

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3. Product Test Reports: For roof membrane and insulation, tests performed by a qualified testing agency, indicating compliance with specified requirements.

4. Field Test Reports: Fastener-pullout test results and manufacturer's revised re-quirements for fastener patterns.

5. Field quality-control reports.

6. Warranties: Sample of special warranties.

C. Closeout Submittals:

1. Maintenance Data: For roofing system to include in maintenance manuals.

1.4 QUALITY ASSURANCE

A. Installer Qualifications: A qualified firm that is approved, authorized, or licensed by mem-brane roofing system manufacturer to install manufacturer's product and that is eligible to receive manufacturer's special warranty.

B. Manufacturer Qualifications: A qualified manufacturer that is UL listed for membrane roofing system identical to that used for this Project.

1.5 DELIVERY, STORAGE, AND HANDLING

A. Deliver roofing materials to Project site in original containers with seals unbroken and labeled with manufacturer's name, product brand name and type, date of manufacture, approval or listing agency markings, and directions for storing and mixing with other com-ponents.

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. Pro-tect stored liquid material from direct sunlight.

1. Discard and legally dispose of liquid material that cannot be applied within its stated shelf life.

C. Protect roof insulation materials from physical damage and from deterioration by sun-light, moisture, soiling, and other sources. Store in a dry location. Comply with insulation manufacturer's written instructions for handling, storing, and protecting during installa-tion.

D. Handle and store roofing materials and place equipment in a manner to avoid permanent deflection of deck.

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1.6 FIELD CONDITIONS

A. Weather Limitations: Proceed with installation only when existing and forecasted weather conditions permit roofing system to be installed according to manufacturer's written instructions and warranty requirements.

1.7 WARRANTY

A. Special Warranty: Manufacturer's standard or customized form, without monetary limi-tation, in which manufacturer agrees to repair or replace components of membrane roof-ing system that fail in materials or workmanship within specified warranty period.

1. Special warranty includes membrane roofing, base flashings, roof insulation, fas-teners, substrate board, living roof components, roofing accessories, and other components of membrane roofing system.

2. Warranty Period: 30 years from date of Substantial Completion.

B. Roofing Installer's warranty, including all components of roofing system.

1. Provide five year installer's material and labor warranty.

PART 2 PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. General Performance: Installed membrane roofing system with compatible components shall withstand specified uplift pressures, building movement, flotation loads, thermally induced movement and exposure to weather without failure. Membrane roofing and base flashings shall remain watertight; and entire system shall not permit passage of liq-uid into building.

B. External Fire Exposure Classification: ASTM E108 Class A, UL listed.

C. Material Compatibility: Provide roofing materials that are compatible with one another under conditions of service and application required, as demonstrated by membrane roofing manufacturer based on testing and field experience.

D. Roofing System Design: Provide membrane roofing system that is identical to systems that have been successfully tested by a qualified testing and inspecting agency to resist uplift pressure calculated according to ASCE/SEI 7. Design roof to meet uplift pressures as indicated on Drawings with a safety factor of two.

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E. Thermal Envelope: Design, fabricate and install insulated membrane roofing system with continuous insulation to provide a thermal envelope.

1. Provide thickness of insulation required to achieve a minimum effective thermal R-value indicated on Drawings.

2.2 MANUFACTURERS

A. Source Limitations: Obtain all components for roofing system from manufacturer ap-proved by membrane roofing manufacturer.

B. Assembly Basis of Design: Siplast Roofing or equal.

2.3 MODIFIED BITUMINOUS MEMBRANE

A. Roofing Membrane: Three-ply roofing system; polymer modified asphalt, reinforced with non-woven fabric.

1. Base Ply and Inter Ply: Smooth, torch-applied.

a. Minimum Quality: ASTM D6164/D6164M Type I; styrene-butadiene-sty-rene (SBS) modified, polyester reinforced. Grade S.

b. Thickness: 94 mils.

c. Tensile Strength: 78 psi machine direction and 80 psi cross machine di-rection, measured according to ASTM 5147.

d. Elongation to Break: 35 percent, measured according to ASTM 5147.

e. Basis of Design: Paradiene 20 TG; Siplast, or equal product as approved by roofing assembly manufacturer.

2. Cap Ply: Granule-Surfaced, torch-applied.

a. Minimum Quality: ASTM D6162 Type II, Grade S; CSA A123.23-15 Type C, Grade 1.

b. Thickness: 150 mils minimum.

c. Basis of Design: Taranap 1M Sand; Siplast, or equal product as approved by roofing assembly manufacturer.

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2.4 SUBSTRATE BOARDS

A. Substrate Board:

1. Glass-Mat Substrate Board: ASTM C1177/C1177M, glass-mat, water-resistant gypsum substrate, 1/2-inch (13 mm) thick, factory primed.

a. Basis of Design Products Georgia Pacific Corporation; Dens Deck Prime, or equal as approved by roofing assembly manufacturer.

2. Cementitious Substrate Board: ASTM C1325 Type A, to match existing thickness.

2.5 ELECTRONIC LEAK-DETECTION (ELD) MATERIALS

A. Conductive Medium Primer: Electrically conductive material specifically designed to ena-ble ELD testing procedures as approved in writing by roofing membrane manufacturer.

1. Product: Detec Systems; TruGround Conductive Primer, or equal.

B. Conductive medium to be located directly under roofing membrane in accordance with ASTM D7877 and ASTM D8231.

2.6 ROOF INSULATION

A. General: Preformed roof insulation boards manufactured or approved by roofing manu-facturer, approved for use in SPRI's "Directory of Roof Assemblies" listed roof assemblies.

B. Extruded-Polystyrene (XPS) Board Insulation: ASTM C578, Type IV, 1.6-lb/cu. ft. minimum density, 25-psi minimum compressive strength, square edged.

1. Thermal Resistance: R-value of 5.0 per inch at 75 degrees F (24 degrees C) mean temperature using ASTM C177 test method.

2. Size: 48 by 96 inches (1220 by 2440 mm).

3. Overall Thickness: Indicated on Drawings.

C. Tapered Insulation: Provide factory-tapered insulation boards fabricated to slope of 1/4 inch per 12 inches (1:48) unless otherwise indicated.

D. Provide preformed saddles, crickets, tapered edge strips, and other insulation shapes where indicated for sloping to drain. Fabricate to slopes indicated.

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2.7 INSULATION ACCESSORIES

A. General: Furnish roof insulation accessories recommended by insulation manufacturer for intended use and compatibility with membrane roofing.

B. Insulation Adhesive: Insulation manufacturer's recommended adhesive formulated to at-tach roof insulation to substrate or to another insulation layer as follows:

1. Full-spread spray-applied, low-rise, two-component urethane adhesive product as approved by roofing assembly manufacturer.

C. Tapered Edge Strips: ASTM C208, Type II, Grade 1, cellulosic-fiber insulation board.

2.8 TRANSITION MEMBRANES

A. Liquid-applied flashing membrane: Fabric reinforced, cold-applied, PMMA membrane.

1. Basis of Design: Parapro 123 PMMA Reinforced Flashing Membrane System by Siplast or equal product as approved by roofing assembly manufacturer.

B. Counterflashing: Stainless steel, Type 304, as specified in Section 07 62 00 - Sheet Metal Flashing and Trim.

2.9 LIVING ROOF ACCESSORIES

A. General: Provide all accessory materials required by the manufacturer for a warrantable installation of the installed products in a manner that meets the Performance and Design Criteria.

B. Root Barrier: 40 mil minimum thickness membrane made from heavy-duty reinforced pol-ymer film, three-ply laminate with high-strength cord grid, flame retardant.

C. Drain Mat: Dual-component prefabricated drainage sheet on protection board with poly-propylene core.

1. Basis of Design: Paradrain W Intensive Drain Mat or equal product as approved by roofing assembly manufacturer for conditions present.

D. Filter Fabric: Highly permeable, nonwoven fabric filtering against particle erosion.

1. Basis of Design: Paradrain W Filter fabric or equal product as approved by roofing assembly manufacturer for conditions present.

E. Rodent Barrier: ¼-inch square metal mesh screen installed in continuous fashion and me-chanically attached to solid substrate at all edges and interruptions and penetrations.

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F. Edging: Extruded aluminum angle, perforated at drainage level to allow for free drainage and solid at growing level to prevent rooting and plant growth through edging.

G. Edging Board: Composite plank material to match existing.

H. Geofoam: Extruded-Polystyrene Board Insulation, ASTM C578, 1.8 lb/cu ft., with compres-sive strength per manufacturer’s recommendation.

I. Geofoam Connectors: Geofoam fill multibarbed, galvanized-steel sheet connectors to be provided per manufacturer’s recommendation.

PART 3 EXECUTION

3.1 EXAMINATION

A. Examine substrates, areas, and conditions, with Installer present, for compliance with re-quirements and other conditions affecting performance of the Work.

3.2 INSTALLATION OF ROOFING, GENERAL

A. Install roofing system according to roofing system manufacturer's written instructions, requirements.

B. Complete terminations and base flashings, and provide temporary seals to prevent water from entering completed sections of roofing system at the end of the workday or when rain is forecast.

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

C. Install roof membrane and auxiliary materials to tie in to existing roofing to maintain weathertightness of transition.

D. Coordinate installation and transition of roofing system component serving as an air bar-rier with air barrier specified in other sections.

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

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3.3 INSTALLATION OF SUBSTRATE BOARD

A. Install substrate board with long joints in continuous straight lines, with end joints stag-gered not less than 24 inches in adjacent rows.

1. At steel roof decks, install substrate board at right angle to flutes of deck.

a. Locate end joints over crests of steel roof deck.

2. Tightly butt substrate boards together.

3. Cut substrate board to fit tight around penetrations and projections, and to fit tight to intersecting sloping roof decks.

4. Fasten substrate board to top flanges of steel deck according to recommenda-tions in SPRI's Directory of Roof Assemblies listed roof assembly requirements for specified Wind Uplift Load Capacity.

5. Fasten substrate board to top flanges of steel deck to resist uplift pressure at cor-ners, perimeter, and field of roof according to roofing system manufacturers' written instructions.

6. Loosely lay substrate board over roof deck.

3.4 INSTALLATION OF INSULATION

A. Coordinate installing roofing system components, so insulation is not exposed to precipi-tation or left exposed at the end of the workday.

B. Comply with roofing system and insulation manufacturer's written instructions for in-stalling roof insulation.

C. Insulation Cant Strips: Install and secure preformed 45-degree insulation cant strips at junctures of roofing system with vertical surfaces or angle changes greater than 45 de-grees.

D. Install base layer of insulation with joints staggered not less than 24 inches in adjacent rows end joints staggered not less than 12 inches in adjacent rows and with long joints continuous at right angle to flutes of decking.

1. Locate end joints over crests of decking.

2. Trim insulation neatly to fit around penetrations and projections, and to fit tight to intersecting sloping roof decks.

3. Make joints between adjacent insulation boards not more than 1/4 inch in width.

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4. Fill gaps exceeding 1/4 inch with insulation.

5. Cut and fit insulation within 1/4 inch of nailers, projections, and penetrations.

E. Install upper layers of insulation and tapered insulation, with joints of each layer offset not less than 12 inches from previous layer of insulation.

1. Staggered end joints within each layer not less than 24 inches in adjacent rows.

2. Install with long joints continuous and with end joints staggered not less than 12 inches in adjacent rows.

3. Trim insulation neatly to fit around penetrations and projections, and to fit tight to intersecting sloping roof decks.

4. Make joints between adjacent insulation boards not more than 1/4 inch in width.

5. Trim insulation, so that water flow is unrestricted.

6. Fill gaps exceeding 1/4 inch with insulation.

7. Cut and fit insulation within 1/4 inch of nailers, projections, and penetrations.

3.5 INSTALLATION OF ROOFING MEMBRANE, GENERAL

A. Install roofing system according to roofing system manufacturer's written instructions and applicable recommendations in ARMA/NRCA's "Quality Control Guidelines for the Application of Polymer Modified Bitumen Roofing."

B. Start installation of roofing in presence of roofing system manufacturer's technical per-sonnel.

C. Coordinate installation of roofing system so insulation and other components of the roof-ing system not permanently exposed are not subjected to precipitation or left uncovered at the end of the workday or when rain is forecast.

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

2. Complete terminations and base flashings, and provide temporary seals to pre-vent water from entering completed sections of roofing system.

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

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3.6 INSTALLATION OF BASE SHEET

A. Before installing, unroll base sheet, cut into workable lengths, and allow to lie flat for a time period recommended by manufacturer for the ambient temperature.

B. Loosely lay one course of sheathing paper, lapping edges and ends a minimum of 2 inches and 6 inches, respectively.

C. Installation of Base Sheet:

1. Install base sheet according to roofing manufacturer's written instructions, start-ing at low point of roofing system.

2. Extend roofing sheets over and terminate above cants.

3. Install base sheet in a shingle fashion.

4. Torch apply to substrate.

a. Perform torch application according to NFPA 241, including two-hour fire watch after torches have been extinguished.

5. Install base sheet without wrinkles, tears, and free from air pockets.

6. Laps: Accurately align roofing sheets, without stretching, and maintain uniform side and end laps.

a. Lap side laps as recommended by roof membrane manufacturer but not less than 3 inches (76 mm).

b. Lap end laps as recommended by roof membrane manufacturer but not less than 12 inches (300 mm).

c. Stagger end laps not less than 18 inches (450 mm).

d. Heat weld end laps, leaving no voids.

e. Roll laps with a 20-pound (9-kg) roller.

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

8. Apply pressure to the body of the base sheet according to manufacturer's instruc-tions, to remove air pockets and to result in complete adhesion of base sheet to substrate.

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3.7 INSTALLATION OF INTERPLY SHEETS

A. Install two one ply sheets, starting at low point of roofing.

1. Align ply sheets without stretching.

2. Shingle side laps of ply sheets uniformly to achieve required number of plies throughout thickness of roofing membrane.

a. Shingle in direction to shed water.

3. Extend ply sheets over and terminate above cants.

3.8 INSTALLATION OF SBS-MODIFIED BITUMINOUS CAP SHEET

A. Before installing, unroll cap sheet, cut into workable lengths, and allow to lie flat for a time period recommended by manufacturer for the ambient temperature at which cap sheet will be installed.

B. Install modified bituminous roofing cap sheet according to roofing manufacturer's written instructions, starting at low point of roofing system.

1. Extend cap sheet over and terminate above cants.

2. Install cap sheet in a shingle fashion.

3. Install cap sheet as follows:

a. Adhere to substrate in a solid mopping of hot roofing asphalt applied at asphalt temperature recommended by cap sheet manufacturer.

b. Adhere to substrate in cold-applied adhesive.

c. Torch apply to substrate.

1) Perform torch application according to NFPA 241, including two-hour fire watch after torches have been extinguished.

4. Install cap sheet without wrinkles or tears, and free from air pockets.

5. Install cap sheet, so side and end laps shed water.

C. Laps: Accurately align roofing sheets, without stretching, and maintain uniform side and end laps.

1. Lap side laps as recommended by roof membrane manufacturer but not less than 3 inches.

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2. Lap end laps as recommended by roof membrane manufacturer but not less than 12 inches.

3. Stagger end laps not less than 18 inches.

4. [Heat weld laps] [Completely bond and seal laps], leaving no voids.

5. Roll laps with a 20-pound roller.

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

D. Apply pressure to the body of the cap sheet according to manufacturer's instructions, to remove air pockets and to result in complete adhesion of base sheet to substrate.

3.9 INSTALLATION OF FLASHING AND STRIPPING

A. Install base flashing over cant strips and other sloped 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 to facilitate leak detection prior to cover.

2. Backer Sheet Application:

a. Adhere backer sheet over roofing membrane at cants in cold-applied ad-hesive.

b. Seal all laps.

c. Seal all laps.

3. Flashing Sheet Application: Torch apply flashing sheet to substrate.

a. Perform torch application according to NFPA 241, including two-hour fire watch after torches have been extinguished.

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. Install liquid flashing system according to manufacturer's recommendations.

1. Extend liquid flashing not less than 3 inches in all directions from edges of item being flashed.

2. Embed granules, matching color of roof membrane, into wet compound.

D. Install roofing cap-sheet stripping where metal flanges and edgings are set on roofing ac-cording to roofing system manufacturer's written instructions.

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3.10 FIELD QUALITY CONTROL

A. Manufacturer's Field Service: Engage a site representative qualified by waterproofing membrane manufacturer to inspect substrate conditions, surface preparation, mem-brane application, flashings, protection, and drainage components; and to furnish daily reports to CO.

1. Low-Voltage Electrical Conductance Testing: Testing agency is to survey entire roof area and flashings to locate discontinuity in the roof membrane using con-ductive primer.

a. Testing agency is to test for leaks using an electronic leak-detection method that locates discontinuities in the waterproofing membrane.

b. Testing agency is to perform tests on abutting or overlapping smaller ar-eas as necessary to cover entire test area.

c. After testing, repair areas of discontinuities, repeat tests, and make fur-ther repairs until roofing and flashing installations are contiguous.

1) Cost of retesting is Contractor's responsibility.

d. Testing agency is to provide survey report indicating locations of initial discontinuities, if any.

2. Waterproofing will be considered defective if it does not pass tests and inspec-tions.

3.11 PROTECTING AND CLEANING

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

B. Correct deficiencies in or remove roofing system that does not comply with requirements, repair substrates, and repair or reinstall roofing system to a condition free of damage and deterioration at time of Substantial Completion and according to warranty requirements.

C. Clean overspray and spillage from adjacent construction using cleaning agents and pro-cedures recommended by manufacturer of affected construction.

END OF SECTION