075213_APP_MBM_roof_Rev1.pdf

SECTION 075213 - ATACTIC-POLYPROPYLENE (APP) MODIFIED BITUMINOUS

MEMBRANE ROOFING (Rev1 edits – Lexie Carroll 27Mar2014)

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Atactic-polypropylene (APP)-modified bituminous membrane roofing.

2. Roof insulation.

3. Roof decking.

4. Roof curbs.

1.2 DEFINITIONS

A. Roofing Terminology: Definitions in ASTM D 1079 and glossary of NRCA's "The NRCA Roofing and Waterproofing Manual" apply to Work of this Section.

1.3 PREINSTALLATION MEETINGS

A. Preinstallation Roofing Conference: Conduct conference at project site.

1.4 ACTION SUBMITTALS

A. Product Data: For each type of product.

B. Shop Drawings: For roofing system. Include plans, elevations, sections, details, and attachments to other work.

C. Samples for Verification: For the following products:

1. Cap sheet, of color required.

2. Flashing sheet, of color required.

1.5 INFORMATIONAL SUBMITTALS

A. Research/Evaluation Reports: For components of roofing system, from ICC-ES.

B. Sample Warranties: For manufacturer's special warranties.

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1.6 CLOSEOUT SUBMITTALS

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

1.7 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 manufacturer's special warranty.

1.8 WARRANTY

A. Special Warranty: Manufacturer agrees to repair or replace components of roofing system that fail in materials or workmanship within specified warranty period.

1. Warranty Period: 20 years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Basis-of-Design Product: Ruberiod EnergyCap Torch Plus FR (Granule) APP Modified Bitumen roofing system by GAF Materials Corporation, or comparable product by one of the following, or equal:

1. CertainTeed Corporation.

2. Johns Manville.

3. Tremco Incorporated.

B. Source Limitations: Obtain components, including all sheets, roof insulation, fasteners, and flashings from the same manufacturer.

2.2 PERFORMANCE REQUIREMENTS

A. Accelerated Weathering: Roofing system shall withstand 2000 hours of exposure when tested according to ASTM G 152, ASTM G 154, or ASTM G 155.

B. Impact Resistance: Roofing system shall resist impact damage when tested according to ASTM D 3746 or ASTM D4272.

C. Roofing System Design: Tested by a qualified testing agency to resist the following uplift pressures:

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1. Corner Uplift Pressure: 75 lbs/sq.ft.

2. Perimeter Uplift Pressure: 49 lbs/sq.ft.

3. Field-of-Roof Uplift Pressure: 30 lbs/sq.ft.

D. Energy Star Listing: Roofing system shall be listed on the DOE's ENERGY STAR "Roof Products Qualified Product List" for low-slope roof products.

E. Energy Performance: Roofing system shall have an initial solar reflectance of not less than 0.84 and an emissivity of not less than .81 when tested according to CRRC-1.

F. Exterior Fire-Test Exposure: ASTM E 108 or UL 790, Class A, for application and roof slopes indicated; testing by a qualified testing agency. Identify products with appropriate markings of applicable testing agency.

G. Fire-Resistance Ratings: Comply with fire-resistance-rated assembly designs indicated.

Identify products with appropriate markings of applicable testing agency.

2.3 ROOFING SHEET MATERIALS

A. Sheathing Paper: Red-rosin type, minimum 3 lb/100 sq. ft. (0.16 kg/sq. m).

B.A. Base Sheet: ASTM D 4601, Type II, FM approved, meeting CGSB-37-GP-56M, nonperforated, asphalt coated, glass-reinforced roofing base sheet, product to be GAF #80 Ultima Base Sheet or equal.

C.B. Roofing Membrane Sheet:

1. ASTM D 6222/D 6222M, Grade S, Type I, APP-modified asphalt sheet smooth surfaced; suitable for application method specified, with the following characteristics meeting ASTM D5147:

a. Tensile strength: 60 lbf/min @ 0 deg F.

b. Elongation: 10% @ 0 deg F.

c. Low temperature flexibility: 32 deg F max

d. Tear Strength: 70 lbf min

e. Dimensional Stability: 0.5 % max

2. Product to be GAF Ruberoid Touch Smooth or equal.

D.C. Granule-Surfaced Roofing Cap Sheet:

1. ASTM D 6222/D 6222M, Grade G, Type I, APP-modified asphalt sheet, reinforced with polyester fabric and coated with fire-retardant APP polymer modified asphalt and granule surfaced, white in color; suitable for application method specified, with the following characteristics meeting ASTM D5147:

a. Tensile strength: 60 lbf/min @ 0 deg F.

b. Elongation: 10% @ 0 deg F.

c. Low temperature flexibility: 32 deg F max

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d. Tear Strength: 70 lbf min

e. Dimensional Stability: 0.5 % max

2. Product to be GAF Ruberoid EnergyCap Touch Granule FR or equal.

2.4 BASE FLASHING SHEET MATERIALS

A. Backer Sheet: ASTM D 4601, Type I, asphalt-impregnated and -coated, glass-fiber sheet, dusted with fine mineral surfacing on both sides.

B. Granule-Surfaced Flashing Sheet: ASTM D 6222/D 6222M, Grade G, Type I, APP-modified asphalt sheet, reinforced with polyester fabric and coated with fire-retardant APP polymer modified asphalt and granule surfaced, white in color.

2.5 AUXILIARY ROOFING MATERIALS

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

1. Liquid-type auxiliary materials shall comply with VOC limits of authorities having jurisdiction.

2. Adhesives and sealants that are not on the exterior side of weather barrier shall comply with the following limits for VOC content:

a. Plastic Foam Adhesives: 50 g/L.

b. Gypsum Board and Panel Adhesives: 50 g/L.

c. Multipurpose Construction Adhesives: 70 g/L.

d. Fiberglass Adhesives: 80 g/L.

e. Contact Adhesives: 80 g/L.

f. Other Adhesives: 250 g/L.

g. Nonmembrane Roof Sealants: 300 g/L.

h. Sealant Primers for Nonporous Substrates: 250 g/L.

i. Sealant Primers for Porous Substrates: 775 g/L.

3. Adhesives and sealants that are not on the exterior side of weather barrier shall comply with the testing and product requirements of the California Department of Public Health's (formerly, the California Department of Health Services') "Standard Method for the Testing and Evaluation of Volatile Organic Chemical Emissions from Indoor Sources Using Environmental Chambers."

B. Asphalt Primer: ASTM D 41/D 41M.

C. Roofing Asphalt: ASTM D 312, Type as recommended by roofing system manufacturer for application.

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D. Cold-Applied Adhesive: Roofing system manufacturer's standard asphalt-based, one- or two-part, asbestos-free, cold-applied adhesive specially formulated for compatibility and use with roofing membrane and base flashings.

E. Asphalt Roofing Cement: ASTM D 4586, asbestos free, of consistency required by roofing system manufacturer for application.

F. Fasteners: Factory-coated steel fasteners and metal or plastic plates complying with corrosion-resistance provisions in FM Global 4470, designed for fastening roofing components to substrate; tested by manufacturer for required pullout strength, and acceptable to roofing system manufacturer.

2.6 ROOF INSULATION

A. Composite Polyisocyanurate Board Insulation: with factory-applied facing board on one major surface, as indicated below by type, and glass-fiber mat facer on the other surface. Meets FM 4450 and UL 1256, ASTM C 209, ASTM D1621, ASTM D2126, ASTM E96, and ASTM E84.

1. Basis-of-Design Product: Subject to compliance with requirements, provide GAF

EnergyGuard Roof Insulation Boards or comparable product by one of the following, or equal:

a. Atlas Roofing Corporation.

b. Firestone Building Products.

c. Homasote Company.

d. Hunter Panels.

e. Insulfoam LLC; a Carlisle company.

f. Johns Manville.

2. Total LTTR (Long Term Thermal Resistance Value) = 11.4 12 for 2 inches thick and 25 for 4 inches thickand 14.4 for 2.5 inches thick..

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

2.7 INSULATION ACCESSORIES

A. Fasteners: Factory-coated steel fasteners and metal or plastic plates complying with corrosion-resistance provisions in FM Global 4470, designed for fastening roof insulation and cover boards to substrate, and acceptable to roofing system manufacturer.

B. Insulation Adhesive: Insulation manufacturer's recommended adhesive formulated to attach roof insulation to substrate or to another insulation layer.

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C. Insulation Cant Strips: ASTM C 728, perlite insulation board.

D. Cover Board: ASTM C 1177/C 1177M, glass-mat, water-resistant gypsum substrate, 1/2 inch (13 mm), factory primed.

1. Products: Subject to compliance with requirements, available products that may be incorporated into the Work include, but are not limited to, the following:

a. CertainTeed Corporation; GlasRoc Sheathing Type X.

b. Georgia-Pacific Corporation; Dens Deck Prime.

c. National Gypsum Company; Gold Bond eXP Extended Exposure

Sheathing.

d. Temple-Inland, Inc; GreenGlass Exterior Sheathing.

e. USG Corporation; Securock Glass Mat Roof Board.

2.8 COATING MATERIALS

A. Roof Coating: Acrylic elastomer emulsion coating, formulated for use on bituminous roof surfaces and complying with ASTM D 6083.

1. Color: White.

2.9 ROOF DECKING

A. Patch holes left by roof curbs removed during demo work with 5/8” CDX plywood to match existing roof decking. Notify Contracting Officer immediately if the existing roof decking is not 5/8” CDX plywood.

2.10 ROOF CURBS

A. General: Units capable of supporting superimposed live and dead loads, including equipment loads and other construction to be supported. Coordinate dimensions with equipment to be supported.

1. Provide preservative-treated wood nailers at tops of units and formed flange at perimeter bottom for mounting to roof.

2. On ribbed or fluted metal roofs, form flange at perimeter bottom to conform to roof profile.

3. Fabricate units to minimum height of 8 inches (200 mm), unless otherwise indicated.

4. Where slope of roof deck exceed 1/4 inch per foot (1:48), fabricate support units with height tapered to match slope to level tops of units.

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B. Fabrication: Unless otherwise indicated or required for strength, fabricate units from minimum 0.0747-inch (1.9mm) thick, structural-quality, hot-dip galvanized steel sheet;

factory primed and prepared for painting with welded or sealed mechanical corner joints.

2.11 ONE WAY ROOF VENTS

A. Solar operated, moisture/vapor venting unit designed to release and prevent the re-entry of moisture laden air; consisting of a roof deck flange and body, a weatherproof cap, and a silicone rubber valve. Size = 10 inches in diameter at flange and 6 inches high.

Johns Manville FP-10 One Way Roof Vent or equal.

PART 3 - EXECUTION

3.1 INSTALLATION, GENERAL

A. Comply with roofing system manufacturer's written instructions.

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

3.2 ROOF CURB INSTALLATION

A. Anchor roof curbs securely to supporting structural substrates so they are capable of withstanding lateral and thermal stresses, and inward and outward loading pressures.

3.3 INSULATION INSTALLATION

A. 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 degrees.

B. Install insulation under area of roofing to achieve required thickness. Where overall insulation thickness is 2.7 inches (68 mm) or greater, install two or more layers with joints of each succeeding layer staggered from joints of previous layer a minimum of 6 inches (150 mm) in each direction.

1. Where installing composite and noncomposite insulation in two or more layers, install noncomposite board insulation for bottom layer and intermediate layers, if applicable, and install composite board insulation for top layer.

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

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

1. Prime surface of concrete deck with asphalt primer at rate of 3/4 gal./100 sq. ft.

(0.3 L/sq. m), and allow primer to dry.

2. Set each layer of insulation in a solid mopping of hot roofing asphalt.

3. Set each layer of insulation in insulation adhesive, firmly pressing and maintaining insulation in place.

E.D. Mechanically Fastened Insulation: Install each layer of insulation and secure to deck using mechanical fasteners specifically designed and sized for fastening specified board-type roof insulation to deck type.

1. Fasten insulation to resist uplift pressure at corners, perimeter, and field of roof.

F. Mechanically Fastened and Adhered Insulation: Install first layer of insulation to deck using mechanical fasteners specifically designed and sized for fastening specified board-type roof insulation to deck type.

1. Fasten first layer of insulation to resist uplift pressure at corners, perimeter, and field of roof.

2. Set each subsequent layer of insulation in a solid mopping of hot roofing asphalt.

3. Set each subsequent layer of insulation in insulation adhesive, firmly pressing and maintaining insulation in place.

G.E. Install cover boards over insulation with long joints in continuous straight lines with end joints staggered between rows. Offset joints of insulation below a minimum of 6 inches (150 mm) in each direction. Loosely butt cover boards together. Tape joints if required by roofing system manufacturer.

1. Fasten cover boards to resist uplift pressure at corners, perimeter, and field of roof.

2. Apply hot roofing asphalt to underside, and immediately bond cover board to substrate.

3.4 ROOFING INSTALLATION

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" and as follows:

1. Deck Type: I (insulated)

2. Adhering Method: T (torched).

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3. Base Sheet: One, installed over sheathing paper.

4. Number of Glass-Fiber Base-Ply Sheets: One

5. Number of APP-Modified Asphalt Sheets: One.

6. Surfacing Type: M (mineral-granule-surfaced cap sheet).

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

C. Loosely lay one course of sheathing paper, lapping edges and ends a minimum of 2 inches (50 mm) and 6 inches (150 mm), respectively.

D.C. Install lapped base-sheet course, extending sheet over and terminating beyond cants.

Attach base sheet as follows:

1. Mechanically fasten to substrate.

2. Spot or strip mop to substrate with hot roofing asphalt.

3. Adhere to substrate in a solid mopping of hot roofing asphalt..

E.D. Install glass-fiber base-ply sheets according to roofing system manufacturer's written instructions starting at low point of roofing system. Align glass-fiber base-ply sheets without stretching. Extend sheets over and terminate beyond cants.

1. Embed each glass-fiber base-ply sheet in a continuous void-free mopping of hot roofing asphalt to form a uniform membrane without glass-fiber base-ply sheets touching.

F.E. Install modified bituminous roofing membrane sheet and cap sheet according to roofing manufacturer's written instructions, starting at low point of roofing system. Extend roofing sheets over and terminate beyond cants.

G.F. Laps: Accurately align roofing 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.

H.G. Install roofing sheets so side and end laps shed water.

3.5 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; secure to substrates according to roofing system manufacturer's written instructions.

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B. Extend base flashing up walls or parapets a minimum of 8 inches (200 mm) above roofing membrane and 4 inches (100 mm) onto field of roofing membrane.

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

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

E. One Way Roof Vents: Install in same locations as existing roof vents to be removed.

Set in roofing cement on top of base layer and below membrane layer.

3.6 COATING INSTALLATION

A. Apply coating to roofing membrane and base flashings according to manufacturer's written instructions, by spray, roller, or other suitable application method to provide a dry film thickness of not less than 20 mils (0.5 mm).

END OF SECTION 075213

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B. Source Limitations: Obtain components, including all sheets, roof insulation, fasteners, and flashings from the same manufacturer.

2. Product to be GAF Ruberoid Touch Smooth or equal.

2. Product to be GAF Ruberoid EnergyCap Touch Granule FR or equal.

3. Adhesives and sealants that are not on the exterior side of weather barrier shall comply with the testing and product requirements of the California Department of Public Health's (formerly, the California Department of Health Services') "Standard M...

2. Total LTTR (Long Term Thermal Resistance Value) = 11.4 12 for 2 inches thick and 25 for 4 inches thickand 14.4 for 2.5 inches thick..

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

B. Fabrication: Unless otherwise indicated or required for strength, fabricate units from minimum 0.0747-inch (1.9mm) thick, structural-quality, hot-dip galvanized steel sheet; factory primed and prepared for painting with welded or sealed mechanical...

G. Install roofing sheets so side and end laps shed water.