36C26119R0025-008.pdf

08-01-16

07 51 13.11 - 1

SECTION 07 51 13.11

HOT-APPLIED BUILT-UP ASPHALT ROOFING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Hot-applied bituminous [hybrid] built-up roofing.

1.2 RELATED REQUIREMENTS

A. Preparation of Existing Membrane Roofs and Repair Areas: Section

07 01 50.19, PREPARATION FOR REROOFING.

B. Roof Insulation: Section 07 22 00, ROOF AND DECK INSULATION.

C. Sheet metal components and wind uplift requirements for roof-edge design: Section 07 60 00, FLASHING AND SHEET METAL.

1.3 APPLICABLE PUBLICATIONS

A. Comply with references to extent specified in this section.

B. American National Standards Institute/Single-Ply Roofing Institute

(ANSI/SPRI):

1. FX-1-01(R2006) - Standard Field Test Procedure for Determining the

Withdrawal Resistance of Roofing Fasteners.

C. American Society of Civil Engineers/Structural Engineering Institute

(ASCE/SEI):

1. 7-10 - Minimum Design Loads for Buildings and Other Structures.

D. American Society of Heating, Refrigerating and Air-Conditioning

Engineers, Inc. (ASHRAE):

1. 90.1-13 - Energy Standard for Buildings Except Low-Rise Residential

Buildings.

E. ASTM International (ASTM):

1. C67-14 - Sampling and Testing Brick and Structural Clay Tile.

2. C140/C140M-15 - Sampling and Testing Concrete Masonry Units and

Related Units.

3. C1370-00(R2012) - Determining Chemical Resistance of Aggregates for

Use in Chemical-Resistant Sulfur Polymer Cement Concrete and Other

Chemical-Resistant Polymer Concretes.

4. C1371-15 - Determination of Emittance of Materials Near Room

Temperature Using Portable Emissometers.

5. C1549-09(2014) - Determination of Solar Reflectance Near Ambient

Temperature Using a Portable Solar Reflectometer.

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6. D146/D146M-04(2012)e1 - Sampling and Testing Bitumen-Saturated Felts and Woven Fabrics for Roofing and Waterproofing.

7. D312/D312M-15 - Asphalt Used in Roofing.

8. D448-12 - Sizes of Aggregate for Road and Bridge Construction.

9. D751-06(2011) - Coated Fabrics.

10. D1644-01(2012) - Nonvolatile Content of Varnishes.

11. D1863/D1863M -05(2011)e1 - Mineral Aggregate Used on Built-Up Roofs.

12. D2178/D2178M-15a - Asphalt Glass Felt Used in Roofing and

Waterproofing.

13. D2523-13 - Testing Load-Strain Properties of Roofing Membranes.

14. D3884-09(2013)e1 - Abrasion Resistance of Textile Fabrics (Rotary

Platform, Double-Head Method).

15. D3909/D3909M-14 - Asphalt Roll Roofing (Glass Felt) Surfaced with

Mineral Granules.

16. D4073-06(2013) - Tensile-Tear Strength of Bituminous Roofing

Membranes.

17. D4263-83(2012) - Indicating Moisture in Concrete by the Plastic

Sheet Method.

18. D4586/D4586M-07(2012)e1 - Asphalt Roof Cement, Asbestos Free.

19. D4601/D4601M-04(2012)e1 - Asphalt-Coated Glass Fiber Base Sheet Used in Roofing.

20. D4897/D4897M-01(2009) - Asphalt Coated Glass Fiber Venting Base

Sheet Used in Roofing.

21. D5147/D5147M-14 - Sampling and Testing Modified Bituminous Sheet

Material.

22. D5201-05a(2014) - Calculating Formulation Physical Constants of

Paints and Coatings.

23. D6162/D6162M-00A(2015)e1 - Styrene Butadiene Styrene (SBS) Modified

Bituminous Sheet Materials Using a Combination of Polyester and

Glass Fiber Reinforcements.

24. D6163/D6163M-00(2015)e1 - Styrene Butadiene Styrene (SBS) Modified

Bituminous Sheet Materials Using Glass Fiber Reinforcements.

25. D6164/D6164M-11 - Styrene Butadiene Styrene (SBS) Modified

Bituminous Sheet Materials Using Polyester Reinforcements.

26. D6511/D6511M-06(2011)e1 - Solvent Bearing Bituminous Compounds.

27. E108-11 - Fire Tests of Roof Coverings.

28. E408-13 - Total Normal Emittance of Surfaces Using Inspection-Meter

Techniques.

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29. E1918-06(2015) - Measuring Solar Reflectance of Horizontal and

Low-Sloped Surfaces in the Field.

30. E1980-11 - Calculating Solar Reflectance of Horizontal and

Low-Sloped Opaque Surfaces.

F. Cool Roof Rating Council (CRRC):

1. 1-15 - Product Rating Program.

G. National Roofing Contractors Association (NRCA):

1. Manual-15 - The NRCA Roofing Manual: Membrane Roof Systems.

H. U.S. Department of Agriculture (USDA):

1. BioPreferred® Program Catalog.

I. UL LLC (UL):

1. 580-06 - Tests for Uplift Resistance of Roof Assemblies.

2. 1897-15 - Uplift Tests for Roof Covering Systems.

J. U.S. Department of Commerce National Institute of Standards and

Technology (NIST):

1. DOC PS 1-09 - Structural Plywood.

2. DOC PS 2-04 - Performance Standard for Wood-Based Structural-Use

Panels.

K. U.S. Environmental Protection Agency (EPA):

1. EPA 600/R-93/116-93 - Method for the Determination of Asbestos in

Bulk Building Materials.

1.4 PREINSTALLATION MEETINGS

A. Conduct preinstallation meeting at the Project site minimum 30 days before beginning Work of this section.

1. Required Participants:

a. Contracting Officer

b. Contracting Officer's Representative.

c. Inspection and Testing Agency.

d. Contractor.

e. Installer.

f. Manufacturer's field representative.

2. Meeting Agenda: Distribute agenda to participants minimum 3 days before meeting.

a. Installation schedule.

b. Installation sequence.

c. Preparatory work.

d. Protection before, during, and after installation.

e. Installation.

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f. Terminations.

g. Transitions and connections to other work.

h. Inspecting and testing.

i. Other items affecting successful completion.

j. Pull out of fasteners.

k. Material storage, including roof deck load limitations.

3. Document and distribute meeting minutes to participants to record decisions affecting installation.

1.5 SUBMITTALS

A. Submittal Procedures: Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

B. Submittal Drawings:

1. Roofing membrane layout.

2. Roofing membrane fastener pattern and spacing.

3. Roofing membrane seaming and joint details.

4. Roof membrane penetration details.

5. Base flashing and termination details.

6. Paver layout.

7. Paver anchoring locations and details.

8. Nailers and cants.

C. Manufacturer's Literature and Data:

1. Description of each product.

2. Minimum fastener pullout resistance.

3. Installation instructions.

4. Warranty.

D. Samples:

1. Roofing Membrane: 150 mm (6 inch) square.

2. Base Flashing: 150 mm (6 inch) square.

3. Fasteners: Each type.

4. Roofing Membrane Seam: 300 mm (12 inches) square.

E. Certificates: Certify products comply with specifications.

1. Fire and windstorm classification.

F. Qualifications: Substantiate qualifications comply with specifications.

1. Installer, including supervisors with project experience list.

2. Manufacturer's field representative with project experience list.

G. Field quality control reports.

H. Temporary protection plan. Include list of proposed temporary materials.

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I. Operation and Maintenance Data:

1. Maintenance instructions.

1.6 QUALITY ASSURANCE

A. Installer Qualifications:

1. Approved by roofing system manufacturer as installer for roofing system with specified warranty.

2. Regularly installs specified products.

3. Installed specified products with satisfactory service on five similar installations for minimum five years.

a. Project Experience List: Provide contact names and addresses for completed projects.

4. Employs full-time supervisors experienced installing specified system and able to communicate with Contracting Officer's

Representative and installer's personnel.

B. Manufacturer's Field Representative:

1. Manufacturer's full-time technical employee or independent roofing inspector.

2. Individual certified by Roof Consultants Institute as Registered

Roof Observer.

1.7 DELIVERY

A. Deliver products in manufacturer's original sealed packaging.

B. Mark packaging, legibly. Indicate manufacturer's name or brand, type, and manufacture date.

C. Before installation, return or dispose of products within distorted, damaged, or opened packaging.

1.8 STORAGE AND HANDLING

A. Comply with NRCA Manual storage and handling requirements.

B. Store products indoors in dry, weathertight facility.

C. Store adhesives according to manufacturer's instructions.

D. Protect products from damage during handling and construction operations.

E. Products stored on the roof deck must not cause permanent deck deflection.

1.9 FIELD CONDITIONS

A. Environment:

1. Product Temperature: Minimum 4 degrees C (40 degrees F) and rising before installation.

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2. Weather Limitations: Install roofing only during dry current and forecasted weather conditions.

1.10 WARRANTY

A. Construction Warranty: FAR clause 52.246-21, "Warranty of

Construction."

B. Manufacturer's Warranty: Warrant roofing system against material and manufacturing defects and agree to repair any leak caused by a defect in the roofing system materials or workmanship of the installer.

1. Warranty Period: 10 years.

PART 2 - PRODUCTS

2.1 SYSTEM DESCRIPTION

A. Roofing System: Hot-applied bituminous [hybrid] built-up roofing.

2.2 SYSTEM PERFORMANCE

A. Design roofing system complying with specified performance of existing as-builts and manufacturers recommendations.

B. Roofing Membrane System Load-Strain Properties: Provide a roofing membrane identical to component systems that have been successfully tested by a qualified independent testing and inspecting agency to meet the following minimum load-strain properties at membrane failure when tested according to ASTM D2523:

C. Tensile strain at failure, at -18 degrees C (0 degrees F): 2.67 lbf

(600 lbf.), minimum; 4.0 to 5.5 percent elongation at break.

2.3 PRODUCTS - GENERAL

A. Provide roof system components from one manufacturer.

B. Sustainable Construction Requirements:

1. Solar Reflectance Index: 78 minimum.

2.4 MEMBRANE AND SHEET MATERIALS

A. Membrane Materials, General: Provide combination of base, ply, and cap sheet materials that have been tested in combination and comply with specified load/strain performance.

B. Base Sheet: ASTM D4601/D4601M, Type II, nonperforated, with the following properties:

1. Breaking Strength, minimum, ASTM D146/D146M: cross machine direction, 12.2 kN/m (70 lbf/in).

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2. Pliability, 12.7 mm (1/2 inch) radius bend, ASTM D146/D146M: No failures.

C. Ply Sheet: ASTM D2178/D2178M, Type VI, heavy-duty ply sheet.

1. Breaking Strength, minimum, ASTM D146/D146M: machine direction,

14.0 kN/m (80 lbf/inch); cross machine direction, 14.0 kN/m

(80 lbf/in).

D. Cap Sheet: Same as ply sheet.

E. Base Flashing Backer Sheet: ASTM D4601/D4601M, Type II.

F. Base Flashing Sheet: ASTM D6164/D6164M, Grade G, Type II, polyester-reinforced, SBS-modified asphalt sheet; with granular surface; Granule Color: White.

2.5 ADHESIVE AND ASPHALT MATERIALS

A. General: Adhesive and sealant materials recommended by roofing system manufacturer for intended use, identical to materials utilized in approved listed roofing system, and compatible with roofing membrane.

B. Water-Based Asphalt Primer: Water-based, polymer modified, asphalt primer with the following physical properties:

1. Asbestos Content, EPA 600/R-93/116: None.

C. Asphalt: ASTM D312/D312M, Type III or IV for roof membrane. Use Type I for pour coat unless specified otherwise.

D. Cold-Applied Adhesive for Membrane Flashing: One-part, cold-applied adhesive compatible with specified roofing membranes and flashings, with the following physical properties:

1. Asbestos Content, EPA 600/R-93/116: None.

2. Nonvolatile Content, minimum, ASTM D6511/D6511M: 75 percent.

3. Uniformity and Consistency, ASTM D6511/D6511M: Pass.

E. Roof Cement: ASTM D4586/D4586M, Type II.

2.6 FASTENERS

A. Roofing Fasteners: Coated, corrosion-resistant steel fasteners and metal or plastic plates, where applicable, tested by fastener manufacturer for required uplift resistance, and recommended by roofing manufacturer for application.

B. Accessory Fasteners: Corrosion-resistant fasteners compatible with adjacent materials and recommended for application by manufacturer of component to be fastened.

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2.7 SURFACING AND COATINGS

A. Aggregate Surfacing, Stone: ASTM D1863/D1863M, except the use of crushed stone is prohibited.

B. Aggregate Surfacing, Slag or Gravel: Use slag on slopes over 1: 10 (1 inch per 12 inches).

C. Aggregate Surfacing, Solar Reflective: White marble aggregate, Solar

Reflectance Index (SRI) when applied with specially formulated white adhesive, Hardness 3.5 Mohs.

D. Aggregate Surfacing Adhesive: Cold-applied surfacing adhesive, formulated for fire-resistant properties.

E. Aggregate Surfacing Adhesive, Solar Reflective: One-part, white, highly reflective polymeric surfacing adhesive, CRRC listed and California

Title 24 Energy Code compliant when combined with approved white gravel, with following physical properties:

1. Asbestos Content, EPA 600 R-93/116: None.

2. Nonvolatile Matter, minimum ASTM D6511/D6511M: 50 percent.

3. Reflectance (adhesive plus aggregate), ASTM C1549: 71 percent.

4. Thermal emittance (adhesive plus aggregate), ASTM C1371: 0.85.

5. Solar Reflectance Index (SRI), adhesive plus gravel, ASTM E1980: 86.

F. White Roof Coating: Water-based, Energy Star Certified, CRRC listed and

California Title 24 Energy Code compliant elastomeric roof coating formulated for use on bituminous roof surfaces, with the following physical properties:

1. Asbestos Content, EPA/600/R13/116: None.

2. Non-Volatile Content (by weight), minimum, ASTM D1644: 60 percent.

3. Percent Solids (by volume), minimum, ASTM D5201: 60 percent.

4. Reflectance, minimum, ASTM C1549: 86 percent.

5. Emissivity, minimum, ASTM C1370: 0.93.

6. Solar Reflectance Index (SRI), ASTM E1980: 103.

2.8 ROOF WALKWAY

A. Prefabricated asphalt plank consisting of a homogeneous core of asphalt, plasticizers and inert fillers, bonded by heat and pressure between two saturated and coated sheets of felt:

1. Top side of plank surfaced with ceramic granules. Granule Color:

White.

2. Size: Minimum 13 mm (1/2 inch) thick, manufacturer’s standard size, but minimum 300 mm (12 inches) in least dimension and 600 mm

(24 inches) in length.

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2.9 ROOF PAVERS

A. N/A

2.10 BALLAST

A. N/A

2.11 ACCESSORIES

A. Temporary Protection Materials:

1. Expanded Polystyrene (EPS) Insulation: ASTM C578.

2. Plywood: NIST DOC PS 1, Grade CD Exposure 1.

3. Oriented Strand Board (OSB): NIST DOC PS 2, Exposure 1.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine and verify substrate suitability for product installation with roofing Installer and roofing inspector present.

1. Verify roof penetrations are complete, secured against movement, and firestopped.

2. Verify roof deck is adequately secured to resist wind uplift.

3. Verify roof deck is clean, dry, and in-plane ready to receive roofing system.

B. Correct unsatisfactory conditions before beginning roofing work.

3.2 PREPARATION

A. Complete roof deck construction before commencing roofing work:

1. Curbs, blocking, edge strips, nailers, cants, and other components to which roofing and base flashing is attached in place ready to receive insulation and roofing.

2. Coordinate roofing membrane installation with flashing work and roof insulation work so insulation and flashing are installed concurrently to permit continuous roofing operations.

3. Complete installation of flashing, insulation, and roofing in same day except for the area where temporary protection is required when work is stopped for inclement weather or end of work day.

B. Dry out surfaces that become wet from any cause during progress of the work before roofing work is resumed. Apply materials to dry substrates, only.

C. Broom clean roof decks. Remove dust, dirt and debris.

D. Remove projections capable of damaging roofing materials.

E. Concrete Decks, except Insulating Concrete:

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1. Test concrete decks for moisture according to ASTM D4263 before installing roofing materials.

2. Test concrete decks for moisture by pouring one pint of hot bitumen at 204 degrees C (400 degrees F.) or EVT on deck at start of each day's work and at start of each new roof area or plane. Do not proceed if test sample foams or can be easily (cleanly) stripped after cooling.

3. Prime concrete decks, including precast units, with primer as specified. Keep primer back 100 mm (4 inches) from precast concrete deck joints.

4. Allow primer to dry before application of bitumen.

F. Insulating Concrete Decks:

1. Allow to dry out minimum five days after installation before installing roofing materials.

2. If rain occurs during or at end of drying period or during installation of roofing, allow additional drying time before the placement of the roofing materials.

G. Poured Gypsum Decks: Dry out poured gypsum according to manufacturer's instructions before application of roofing materials.

H. Existing Membrane Roofs and Repair Areas:

1. Comply with requirements in Section 07 01 50.19 PREPARATION FOR

REROOFING.

3.3 TEMPORARY PROTECTION

A. Install temporary protection consisting of a temporary seal and water cut-offs at the end of each day's work and when work is halted for an indefinite period or work is stopped when precipitation is imminent.

B. Install temporary cap flashing over top of base flashings where permanent flashings are not in place to protect against water intrusion into roofing system. Securely anchor in place to prevent blow off and damage by construction activities.

C. Temporarily seal exposed insulation surfaces within roofing membrane.

1. Apply temporary seal and water cut off by extending roofing membrane beyond insulation and securely embedding edge of the roofing membrane in 6 mm (1/4 inch) thick by 50 mm (2 inches) wide strip of temporary closure sealant. Weight roofing membrane edge with sandbags, to prevent displacement; space sandbags maximum 2400 mm

(8 feet) on center.

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2. Direct water away from work. Provide drainage, preventing water accumulation.

3. Check daily to ensure temporary seal remains watertight. Reseal open areas and weight down.

D. Before the work resumes, cut off and discard portions of roof membrane in contact with temporary seal.

1. Cut minimum 150 mm (6 inches) back from sealed edges and surfaces.

E. Remove sandbags and store for reuse.

3.4 INSTALLATION - GENERAL

A. Install products according to manufacturer's instructions and approved submittal drawings.

1. When manufacturer's instructions deviate from specifications, submit proposed resolution for Contracting Officer's Representative consideration.

B. Comply with NRCA Manual installation instructions.

C. Comply with UL 580 for uplift resistance.

3.5 ROOFING INSTALLATION

A. Heating Bitumen:

1. Heat the asphalt to the equiviscous temperature within plus or minus -14 degrees C (25 degrees F) at the time of application:

a. Do not heat asphalt greater than 38 degrees C (100 degrees F) above the equiviscous temperature.

b. When the equiviscous temperature is not furnished by the asphalt manufacturer, do not heat asphalt above 275 degrees C

(525 degrees F) for Type III and IV with temperature minimum

250 degrees C (475 degrees F) at time of application.

2. Do not heat bitumen above the flash point temperature.

3. Provide heating kettles with a thermometer kept in operating condition. Attend kettle during heating to ensure that the bitumens are heated within the temperatures specified.

4. Use Type III and Type IV asphalt between plies.

5. Do not mix different type of asphalt in kettle.

3.6 INSTALLATION OF BUILT-UP BITUMINOUS ROOFING

A. Primer: Apply primer to substrates where recommended by roofing manufacturer, in application quantities recommended by roofing manufacturer.

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B. Hot Roofing Asphalt: Apply hot roofing asphalt in quantities required, immediately followed by membrane materials embedded therein before bitumen cools below the application temperature limit.

1. Provide uniform and positive adhesion between all installed materials, including adhesion to insulation or substrate, and between each ply of felt.

2. Do not apply more material than can be covered at one time except for glaze coats.

3. Recoat cooled areas.

4. Do not allow bitumen to penetrate joints or enter building. Where mopping is applied directly to a substrate, tape joints. When applying steep asphalt, hold mopping back 50mm (2 inches) from both sides of joint.

C. Application Rates:

1. Between substrate and sheets and between plies: 10 to 17.5 kg per

10 sq. m (20 to 35 lbs per 100 sq. ft.).

2. Glaze Coats: 7 to 11 Kg per 10 sq. m (15 to 25 lbs per 100 sq. ft.).

3. Pour Coats: 25 to 30 Kg per 10 sq. m (55 to 65 lbs per 100 sq. ft.).

4. Provide asphalt quantities within the indicated ranges, unless recommended otherwise in the roofing materials manufacturer's printed data.

D. Cold-Applied Adhesive:

1. Apply cold-applied adhesive in a uniform application at rate recommended by manufacturer.

E. Built-Up Membrane Sheets:

1. Number of Plies: Four, minimum, including cap sheet, and not including base sheet if any. Provide additional plies as required to meet load/strain properties specified in Part 2 of this Section.

2. Begin laying sheets at low points.

3. Roll sheets into hot roofing asphalt brushing down to firmly embed, free of wrinkles, fish mouths, blisters, bubbles, voids, air pockets or other defects that prevent complete adhesion:

4. Cut to fit closely around pipes, roof drains, bitumen stops, and similar roof projections.

5. Lap sheets shingle fashion starting with starter strips at right angles to slope of roof.

6. Laps for base sheet and ply sheets:

a. Base sheet, lapped 50 mm (2 inches).

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b. Two plies with 450 mm (18 inches) and 900 mm (36 inches) starting widths, lapped 480 mm (19 inches).

c. Three plies with 300 mm (12 inches) 600 mm (24 inches) and

900 mm (36 inches) starting widths, lapped 624 mm

(24-1/2 inches).

d. Four plies with 230, 460, 690 and 900 mm (9, 18, 27 and 36 inch) starting widths, lapped 700 mm (27-1/2 inches).

e. End joints of ply and base sheet, lapped 50 mm (2 inches).

Stagger end joints in relation to joints in adjacent and proceeding plies.

F. Roofing on Nailable Decks:

1. On insulating concrete, install one ply of venting base sheet with mineral aggregate surface down, nailed to deck with lap as specified and seal lap edges with roof cement. Terminate venting base sheet as follows:

a. At vertical surfaces: Extend venting base sheet up vertical surface over cants to top of base flashing or curb.

b. At roof edge under gravel stops install venting base sheet over blocking: Extend base sheet minimum two inches beyond outer edge and turn down so that venting can be accomplished.

c. At roof edge over fascia-cant: Extend base sheet over top of cant and turn down over outer face of cant to permit venting at the edge.

2. On poured gypsum, precast gypsum plank, cement-wood fiber plank, wood plank, or plywood decks install one layer of building paper followed by base sheet.

a. Apply building paper lapping ends and edges 50 mm (two inches)

Lay smoothly without buckles or wrinkles. Staple or nail sufficiently to hold in place until roof membrane is installed.

b. One ply of venting base sheet. Lay base sheet down dry on deck, Nail as specified. Lap as specified and seal lap edges with roof cement.

G. Roof Edges and Terminations:

1. Where nailers occur at roof edges under gravel stops or penetrations to receive metal base flashing, apply a continuous strip of underlayment over the nailers before the first ply sheet is applied.

Install strip on top of venting base sheet if any.

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2. After membrane is installed, turn the underlayment back over the roofing, and secure in place with hot roofing asphalt before gravel stops or other metal flanges extending out onto the membrane are installed.

3. Where cants occur at vertical surfaces, cut off roofing sheets 50 mm

(2 inches) above top of cant strips, except at prefabricated curbs, scuttles and other roof accessories having integral cants, extend membrane over cant and up vertical surface to top of curb or nailer as shown.

4. Where fascia-cant occurs at roof edges, extend membrane beyond outside cant face and cut off at outside after base flashing is installed.

5. Where reglet occurs at vertical surfaces, extend plies roofing sheets up into reglet the full depth of the reglet.

H. Base Sheet Installation:

1. One ply of base sheet dry to deck, except mop between laps. Lap and attach as specified to deck.

I. Venting Base Sheet Installation:

1. At vertical surfaces: Extend venting base sheet up vertical surface over cants to top of base flashing or curb.

2. At roof edge under gravel stops install venting base sheet over blocking: Extend base sheet minimum 50 mm (2 inches) beyond outer edge and turn down to allow venting at the edge.

3. At roof edge over fascia-cant: Extend base sheet over top of cant and turn down over outer face of cant to allow venting at the edge.

J. Roof Ply Installation:

1. Extend first ply sheet 100 mm (4 inches) beyond the insulation and the second ply sheet 75 mm (3 inches) beyond the first. Lap ends

75 mm (3 inches) with joints broken 450 mm (18 inches) in each ply.

3.7 BASE FLASHING

A. Prime vertical surfaces of masonry and concrete with asphalt primer except where vented base sheet is required to provide edge venting.

B. Apply flashing on top of built-up roofing, up face of cant and vertical surfaces, at least 200 mm (8 inches) above the roof, full height beneath counter flashing or top of curb flashing:

1. At fascia-cants, extend to top of cant and cut off.

2. Extend plies of roofing into reglet the full depth of the reglet.

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C. Except at metal fascia cants, secure top edge of base flashing with nails on a line approximately one inch below top edge, spaced maximum

200 mm (8 inches) on center.

1. Cover all nail heads with roof cement.

2. Cover the top of the base flashing with counter flashing as specified in Section 07 60 00, FLASHING AND SHEET METAL. At the cants secure the top edge of the flashing with fascia compression clamp as specified in Section 07 60 00, FLASHING AND SHEET METAL.

D. Install flashing using longest pieces practicable. Complete splices between flashing and main roof sheet before bonding to vertical surface. Seal splice minimum 76 mm (3 inches) beyond fasteners that attach membrane to blocking. Apply bonding adhesive to both flashing and surface to which flashing is being adhered per manufacturer recommendations. Nail top of flashing 300 mm (12 inches) on center under metal counter flashing or cap.

1. Parapet Walls: Extend up parapet and turn over top edge. Apply with

100 percent adhesive.

E. Install flashing over cants to make system watertight.

F. Install flashing before final roofing coat and aggregate are installed.

3.8 APPLICATION OF COATING

A. Apply coating on cap sheet and membrane flashings that do not meet solar reflectance requirements.

B. Apply coating to built-up roofing and base flashings according to manufacturer's instructions by spray or roller.

C. Provide dry film thickness of minimum 0.5 mm (20 mils).

3.9 STRIPPING

A. Set flanges of metal flashing in roof cement before the final bituminous coat and roof aggregate are installed and nail to blocking per Section 07 60 00, FLASHING AND SHEET METAL.

B. Before the final bituminous coat and aggregate are installed, cover that portion of the horizontal flanges of metal base flashing, gravel stops and other flanges, extending onto the roofing with flashing sheet.

3.10 AGGREGATE SURFACING

A. After bituminous base flashing and stripping has been installed, uniformly coat the entire roof surface, except cants, with bitumen pour coat at the rate scheduled.

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B. Use Type III asphalt on slopes over 1: 10 (one inch per foot).

C. While still hot, embed aggregate to cover the roofing sheet completely without bare spots, but minimum 20 kg/sq. m (400 lbs./100 sq. ft.) of dry gravel or 15 kg/sq. m (300 lbs./100 sq. ft.) of dry slag per. Do not leave any exposed bitumen.

D. Do not embed aggregate under roof walkways.

E. In cold weather preheat aggregate before application.

F. Do not place aggregate material in piles or rows on bare or glaze coated felt.

G. If aggregate surfacing is delayed, promptly apply glaze coat of hot roofing asphalt at rate scheduled.

3.11 WALKWAY INSTALLATION

A. Install roof walkways where shown and existing.

B. Set prefabricated planks in solid application of cold-applied adhesive.

Maintain 75 mm (3 inch) to 150 mm (6 inch) space between planks.

3.12 PAVER INSTALLATION

A. N/A

3.13 INSTALLATION OF AGGREGATE BALLAST

A. Install aggregate ballast as soon as roof membrane is installed.

B. Protection Mat:

1. Loose lay protection mat over roof membrane smooth and free of tension and stress without wrinkles. Do not stretch sheet.

2. Use full sheet width at perimeters with end laps held back minimum

3 m (10 feet) from roof edge at corners.

3. Lap ends minimum 300 mm (1foot).

4. Extend 50 to 75 mm (2 to 3 inches) above ballast at perimeter and penetrations.

C. Aggregate Installation:

1. Except where pavers are used, uniformly distribute aggregate over the protection mat.

3.14 FIELD QUALITY CONTROL

A. Field Inspections:

B. Field Tests: Performed by testing laboratory specified in Section

01 45 29, TESTING LABORATORY SERVICES.

1. Fastener Pull Out Tests: ANSI/SPRI FX-1; one test for every

230 sq. m (2,500 sq. ft.) of deck. Perform tests for each

07 51 13.11 - 17 combination of fastener type and roof deck type before installing roof insulation.

a. Test at locations selected by Contracting Officer's

Representative.

b. Do not proceed with roofing work when pull out resistance is less than manufacturer's required resistance.

c. Test Results:

1) Repeat tests using different fastener type or use additional fasteners achieve pull out resistance required to meet specified wind uplift performance.

2) Patch cementitious deck to repair areas of fastener tests holes.

2. Examine and probe roofing membrane and flashing seams in presence of

Contracting Officer's Representative and Manufacturer's field representative.

3. Probe seams to detect marginal bonds, voids, skips, and fishmouths.

4. Cut 100 mm (4 inch) wide by 300 mm (12 inch) long samples through seams where directed by Contracting Officer's Representative.

5. Cut one sample for every 450 m (1500 feet) of seams.

6. Cut samples perpendicular to seams.

7. Failure of samples to pass ASTM D1876 test will be cause for rejection of work.

8. Repair areas where samples are taken and where marginal bond, voids, and skips occur.

9. Repair fishmouths and wrinkles by cutting to lay flat. Install patch over cut area extending 100 mm (4 inches) beyond cut.

C. Manufacturer Services:

1. Inspect initial installation, installation in progress, and completed work.

2. Issue supplemental installation instructions necessitated by field conditions.

3. Prepare and submit inspection reports.

4. Certify completed installation complies with manufacturer's instructions and warranty requirements.

3.15 CLEANING

A. Remove excess adhesive before adhesive sets.

B. Clean exposed roofing surfaces. Remove contaminants and stains // to comply with specified solar reflectance performance //.

07 51 13.11 - 18

3.16 PROTECTION

A. Protect roofing system from traffic and construction operations.

1. Protect roofing system when used for subsequent work platform, materials storage, or staging.

2. Distribute scaffolding loads to exert maximum 50 percent roofing system materials compressive strength.

B. Loose lay temporary insulation board overlaid with plywood or OSB.

1. Weight boards to secure against wind uplift.

C. Remove protective materials immediately before acceptance.

D. Repair damage.

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