07550-Modified Bitumin Roofing 20090226.doc

Ellington Field JRB Houston, Texas

MODIFIED BITUMINOUS MEMBRANE ROOFING

PART 1

GENERAL

1.1

SECTION INCLUDES

A.

Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specifications Sections apply to this section 1.2

RELATED SECTIONS

A.

Section 06100 - Rough Carpentry: Wood blocking and nails.

B.

Section 07590 - Preparation for Reroofing.

C.

Section 07220 - Roof and Deck Insulation.

D.

Section 07600 - Flashing and Sheet Metal.

1.3

REFERENCES

A.

American Society of Civil Engineers (ASCE):

1.

ASCE 7-02, Minimum Design Loads for Buildings and Other Structures.

B.

American Society for Testing and Materials (ASTM):

ASTM D41, Specification for Asphalt Primer Used in Roofing, Dampproofing and Waterproofing.

2.

ASTM D312, Specification for Asphalt Used in Roofing.

3.

ASTM D451, Test Method for Sieve Analysis of Granular Mineral Surfacing for Asphalt Roofing Products.

4.

ASTM D1079, Terminology Relating to Roofing, Waterproofing and Bituminous Materials.

5.

ASTM D1227, Specification for Emulsified Asphalt Used as a Protective Coating for Roofing.

6.

ASTM D1863, Specification for Mineral Aggregate Used as a Protective Coating for Roofing.

7.

ASTM D2178, Specification for Asphalt Glass Felt Used as a Protective Coating for Roofing.

8.

ASTM D2822, Specification for Asphalt Roof Cement.

9.

ASTM D2824, Specification for Aluminum-Pigmented Asphalt Roof Coating.

10.

ASTM D4601, Specification for Asphalt Coated Glass Fiber Base Sheet Used in Roofing.

11.

ASTM D5147, Test Method for Sampling and Testing Modified Bituminous Sheet Materials.

12.

ASTM D6162, Specification for Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using a Combination of Polyester and Glass Fiber Reinforcements.

13.

ASTM D6163, Specification for Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using Glass Fiber Reinforcements.

14.

ASTM E108, Test Methods for Fire Test of Roof Coverings.

C.

Factory Mutual Research (FM):

1.

Roof Assembly Classifications.

D.

National Roofing Contractors Association (NRCA):

Roofing and Waterproofing Manual.

E.

Underwriters Laboratories, Inc. (UL):

Fire Hazard Classifications.

F.

Warnock Hersey (WH):

1.

Fire Hazard Classifications.

1.4

SYSTEM DESCRIPTION

A.

It is the intent of this specification to install a long-term, quality roof system that meets or exceeds all current NRCA guidelines as stated in the most recent edition of the NRCA Roofing and waterproofing Manual. Please discuss any concerns with the Contracting Officer and Roofing System Manufacturer.

1.5

SUBMITTALS

A.

Any material submitted as equal to the specified material must be accompanied by a copy of the manufacturer's standard specification section. That specification section shall be signed and sealed by a professional engineer licensed in the State or Province in which the installation is to take place. Substitution requests containing specifications without licensed engineer certification shall be rejected for non-conformance.

B.

Submit under provisions of Section [01300].

C.

Product Data: Provide manufacturer’s technical product data for each type of roofing product specified. Include data substantiating that materials comply with specified requirements.

D.

Samples: Submit [two (2)] samples of each product specified.

E.

Manufacturer’s Installation Instructions: Submit installation instructions and recommendations indicating special precautions required for installing the membrane.

F.

Manufacturer’s Certificate: Certify that roof system furnished is approved by Factory Mutual, Underwriters Laboratories, Warnock Hersey or approved third party testing facility in accordance with ASTM E108, Class A for external fire and meets local or nationally recognized building codes.

G.

Manufacturer’s Certificate: Certify that the roof system is adhered properly to meet or exceed the requirements of FM [1-90].

H.

Manufacturer’s Certificate: Certify that the roof system furnished meets Factory Mutual Approval

Standard 4470.

I.

Manufacturer’s Certificate: Certify that materials are manufactured in the United States and conform to requirements specified herein, are chemically and physically compatible with each other and are suitable for inclusion within the total roof system specified herein.

J.

Manufacturer’s Certificate: Submit a certified copy of the roofing manufacturer’s ISO 9001 compliance certificate.

K.

Test Reports: Submit test reports, prepared by an independent testing agency, for all modified bituminous sheet roofing indicating compliance with ASTM D5147.

L.

Submit a copy of an unexecuted manufacturer’s warranty for review.

M.

Written certification from the roofing manufacturer certifying the applicator is currently authorized for the installation of the specified roof system.

N.

Design Loads: Submit copy of manufacturer's minimum design load calculations according to ASCE 7-02, Method 2 for Components and Cladding, sealed by a registered professional Contracting Officer employed by the system manufacturer as a full-time staff Contracting Officer. In no case shall the design loads be taken to be less than those detailed in article 1.14 of this specification.

1.6

QUALIFICATIONS

A.

Manufacturer: Company specializing in manufacturing the products specified in this section with minimum 12 years documented experience and shall have ISO 9001 certification.

B.

Installer: Company specializing in modified bituminous roofing installation with a minimum 5 years experience and authorized by roofing system manufacturer as qualified to install manufacturer’s roofing materials.

C.

Installer’s Field Supervision: Maintain a full-time Supervisor/Foreman on job site during all phases of roofing work and at any time roofing work is in progress. Maintain proper supervision of workmen. Maintain a copy of the specifications in the possession of the Supervisor/Foremen and on the roof at all times.

D.

Immediately correct roof leakage during construction. If the Contractor does not respond within twenty four (24) hours, the Owner has the right to hire a qualified contractor and back charge the original contractor.

E.

Insurance Certification: Assist Owner in preparation and submittal of roof installation acceptance certification as may be necessary in connection with fire and extended coverage insurance on roofing and associated work.

1.7

PRE-INSTALLATION CONFERENCE

A.

Pre-Roofing Conference: Convene a pre-roofing conference approximately two (2) weeks before scheduled commencement of modified bituminous roofing system installation and associated work.

B.

Require attendance of installer of each component of associated work: Installers of deck or substrate construction to receive roofing work, installers of rooftop units and other work in and around roofing which must precede or follow roofing work (including mechanical work if any), Contracting Officer, Owner, roofing system manufacturer’s representative, and other representatives directly concerned with performance of the Work, including (where applicable) Owner’s insurers, testing agencies and governing authorities.

C.

Objectives of conference to include:

1. Review foreseeable methods and procedures related to roofing work, including set up and mobilization areas for stored material and work area.

2. Tour representative areas of roofing substrates (decks), inspect and discuss condition of substrate, roof drains, curbs, penetrations and other preparatory work performed by others.

3. Review structural loading limitations of deck and inspect deck for loss of flatness and for required attachment.

4. Review roofing system requirements (drawings, specifications and other contract documents.

5. Review required submittals both completed and yet to be completed.

6. Review and finalize construction schedule related to roofing work and verify availability of materials, installer’s personnel, equipment and facilities needed to make progress and avoid delays.

7. Review required inspection, testing, certifying and material usage accounting procedures.

8. Review weather and forecasted weather conditions and procedures for coping with unfavorable conditions, including possibility of temporary roofing (if not mandatory requirement.

9. Record discussion of conference including decisions and agreements (or disagreements) reached and furnish copy of record to each party attending. If substantial disagreements exist at conclusion of conference, determine how disagreements will be resolved and set date for reconvening conference.

10. Review notification procedures for weather or non-working days.

1.8

DELIVERY, STORAGE AND HANDLING

A. Deliver products to site with seals and labels intact, in manufacturer’s original containers, dry and undamaged.

B. Store and handle roofing sheets in a dry, well-ventilated, weather-tight place to ensure no possibility of significant moisture exposure. Store rolls of felt and other sheet materials on pallets or other raised surface.

Stand all roll materials on end. Cover roll goods with a canvas tarpaulin or other breathable material (not polyethylene).

C. Do not leave unused materials on the roof overnight or when roofing work is not in progress unless protected from weather and other moisture sources.

D. It is the responsibility of the contractor to secure all material and equipment on the job site. If any material or equipment is stored on the roof, the contractor must make sure that the integrity of the deck is not compromised at any time. Damage to the deck caused by the contractor will be the sole responsibility of the contractor and will be repaired or replaced at his expense.

1.9

MANUFACTURER’S INSPECTIONS

A. When the project is in progress, the roofing system manufacturer will provide the following:

1. Keep the Contracting Officer or Owner informed as to the progress and quality of thework as observed.

2. Provide periodic job site inspections

3. Report to the Contracting Officer in writing any failure or refusal of the Contractor to correct unacceptable practices called to the Contractor’s attention.

4. Confirm after completion that manufacturer has observed no applications procedures in conflict with the specifications other than those that may have been previously reported and corrected.

1.10 PROJECT CONDITIONS

A. Proceed with roofing work only when existing and forecasted weather conditions will permit unit of work to be installed in accordance with manufacturer’s recommendations and warranty requirements.

B. Do not apply roofing insulation or membrane to damp deck surface.

C. Do not expose materials vulnerable to water or sun damage in quantities greater than can be weatherproofed during same day. All slopes of greater than 1-1/2:12 require back-nailing to prevent slippage of the ply sheets. Use ring or spiral shank one (1) inch cap nails or screws and plates at a rate of one (1) fastener per ply (including the modified membrane) at each insulation stop. Place insulation stops at 16 ft o.c. for slopes less than 3:12 and four (4) ft o.c. for slopes greater than 3:12. On non-insulated systems, nail each ply directly into the deck at the rate specified above. When slope exceeds 11/2:12, install all plies parallel to the slope (strapping) to facilitate back-nailing. Install four (4) additional fasteners at the upper edge of the modified bitumen sheet when strapping the plies.

1.11

SEQUENCING AND SCHEDULING

A. Sequence installation of modified bituminous sheet roofing with related units of work specified in other sections to ensure that roof assemblies including roof accessories, flashing, trim and joint sealers are protected against damage from effects of weather, corrosion and adjacent construction activity.

B. Fully complete all modified bituminous membrane roofing field assembly work each day. Phased construction will not be accepted.

1.12

WARRANTY

A. Upon completion of installation, and acceptance by the Owner and Contracting Officer, the manufacturer will supply to the Owner a 20 year “No Dollar Limit” warranty.

B. Installer will submit a minimum of a [two (2)] year warranty to the membrane manufacturer with a copy directly to Owner.

C. Warranty must include Section 07410 and 07412.

PART 2

PRODUCTS

2.1

ACCEPTABLE MANUFACTURERS

A. When a particular performance standard is specified it shall be indicative of a standard required.

B. Provide products as manufactured by The Garland Company. Submit substitutions under provisions of Section [01600].

C. Any item or materials submitted as a substitution to the specified material performance must comply in all respects as to the quality and performance of the brand name specified and the manufacturer shall provide all services specified. The Contracting Officer/Owner shall be the sole judge as to whether or not an item submitted as a substitute is truly equal. Should the Contractor choose to submit a substitute product, he shall assume all monetary or other risk involved, should the Contracting Officer/Owner find the substitution unacceptable.

2.2

DESCRIPTION

A. Modified bituminous sheet roofing work including but not limited to:

1. Two plies Polyester-Fiberglass-Polyester base sheet double coated with special oxidized asphalt, bonded to the prepared substrate with bitumen.

2. Bitumen will consist of a V.O.C. compliant, non-asbestos containing cold applied adhesive for roof slopes up to 3:12.

3. All flashings will be set in bitumen and will be one ply of Polyester-Fiberglass-Polyester base sheet double coated with special oxidized asphalt and covered by an additional layer of modified bitumen membrane.

4. Modified Membrane: 135 mil SIS and SBS (Styrene-Isoprene-Styrene and Styrene-Butadiene-Styrene) mineral surfaced rubber modified roofing membrane reinforced with a dual fiberglass scrim and polyester mat.

2.3

BITUMINOUS MATERIALS

A. Asphalt Primer: V.O.C. compliant, ASTM D-41.

B. Asphalt Roofing Mastic: V.O.C. compliant, ASTM D-2822, Type II.

C. Cold Applied Membrane Adhesive: V.O.C. compliant ASTM D-3019.

Performance Requirements:

Non-Volatile Content

ASTM D-4479

70%

Density

ASTM D-1475

7.89 lb./gal. (0.9kg/l)

V.O.C.

ASTM D-3960

300 gal/I max.

Viscosity Stormer

ASTM D-562

16-20 sec.

Special Blade

5.

Flash Point

ASTM D-93

100°F min. (37°C)

6.

Slope

1:12 - 3:12

D. Brush Grade Flashing Adhesive

Performance Requirements:

Non-Volatile Content

ASTM D-4479

70 min.

Density

ASTM D-1475

8.6 lb./gal. (1kg/l)

V.O.C.

ASTM D-3960

295 g/l max.

Flash Point

ASTM D-93

100°F (37°C) 2.4

SHEET MATERIALS

A. Base Plies (2)

Double coated Polyester-Fiberglass-Polyester scrim with the following minimum performance requirements according to ASTM D5147.

Properties (Finished Membrane):

Tensile Strength (ASTM D2523)

2 in/min. @73.4 3.6°F

MD 315 lbf/in

CMD 315 lbf/in

50mm/min@23@+3°C

MD 55kN/m

CMD 55kN/m

Tear Strength (ASTM D4073)

2 in/min. @ 73.4 3.6°F MD 550 lbf

CMD 550 lbf

MD 2446N

CMD 2446N

Elongation at Maximum Tensile (ASTM D2523)

MD 5.0%

CMD 6.0%

B. Base Flashing Ply

Double coated Polyester-Fiberglass-Polyester scrim with the following minimum performance requirements according to ASTM D5147.

Properties (Finished Membrane):

Tensile Strength (ASTM D2523)

2 in/min. @73.4 3.6°F

MD 315 lbf/in

CMD 315 lbf/in

MD 55kN/m

CMD 55kN/m

Tear Strength (ASTM D4073)

MD 550 lbf

CMD 550 lbf

MD 2446N

CMD 2446N

Elongation at Maximum Tensile (ASTM D2523)

MD 5.0%

C. Modified Flashing Ply

ASTM D6162, Type III Grade S

Tensile Strength (ASTM D5147)

MD 500 lbf/in

CMD 550 lbf/in

(50 mm/min. @ 23 3°C) MD 87.5 kN/m

CMD 96.25 kNm

Tear Strength (ASTM D5147)

MD 900 lbf

CMD 950 lbf

50 mm/min. @ 23 3°C

MD 4003 N

CMD 4226 N

Elongation at Maximum Tensile (ASTM D5147)

MD 6.0%

Low Temperature Flexibility (ASTM D5147):

Passes -30°F (-34°C)

D. Modified Membrane Properties (Finished Membrane):

1.ASTM D6162, Type III Grade G

Tensile Strength (ASTM D5147)

MD 500 lbf/in

CMD 500 lbf/in

MD 87.5 kN/m

CMD 87.5 kNm

Tear Strength (ASTM D5147)

MD 900 lbf

CMD 950 lbf

MD 4003 N

CMD 4226 N

Elongation at Maximum Tensile (ASTM D5147)

Low Temperature Flexibility (ASTM D5147):

Passes -30°F (-34°C) 2.5

SURFACINGS

A. Mineral Surfaced Membranes - Roofing Granules shall meet requirements of ASTM D-451 and/or be recommended by the membrane manufacturer. Loose granules for bleed-out shall match size and color of granulated membrane sheet.

2.6

RELATED MATERIALS

A. Roof Insulation: In accordance with Section 07220.

B. Roof Insulation Fasteners: In accordance with Section 07220.

C. Nails and Fasteners: Non-ferrous metal or galvanized steel, except that hard copper nails shall be used with copper; aluminum or stainless steel nails shall be used with aluminum; and stainless steel nails shall be used with stainless steel. Fasteners shall be self-clinching type of penetrating type as recommended by the manufacturer of the deck material. Nails and fasteners shall be flush-driven through flat metal discs of not less than one (1) inch diameter. Omit metal discs when one-piece composite nails or fasteners with heads not less than one (1) inch diameter are used.

D. Metal Discs: Flat discs or caps of zinc-coated sheet metal not lighter than 28 gauge and not less than on (1) inch in diameter. Form discs to prevent dishing. Bell or cup shaped caps are not acceptable.

E. Walkway Pads: As recommended and furnished by the membrane manufacturer set in approved adhesive to control foot traffic on roof top surface.

F. Walkway Pad Adhesive: Adhesive used to adhere approved walk way pads as recommended and furnished by the membrane manufacturer.

G. Rust Inhibitive Paint: As recommended and furnished by the membrane manufacturer for mechanical units and other metal surfaces to control and prevent surface rust.

H. Urethane Sealant: One part, non-sag sealant as recommended and furnished by the membrane manufacturer for moving joints.

Tensile Strength (ASTM D412)

250 psi

Elongation (ASM D412)

950%

Hardness, Shore A (ASTM C920)

Adhesion-in-Peel (ASTM C920)

30 pli

I. HButyl Tape: 100% solids, asbestos free and compressive tape designed to seal as recommended and furnished by the membrane manufacturer.

J. Non-Shrink Grout: Use an all weather fast setting chemical action concrete material to fill pitch pans.

1. Flexural Strength (ASTM C-78 (modified)) 7 days 1100psi

2. High Strength (ASTM C-109 (modified)) 24 days 8400lbs (3810kg)

K. Pitch Pocket Sealer: Two part, 100% solids, self leveling, polyurethane sealant for filling pitch pans as recommended and furnished by the membrane manufacturer.

Durometer (ASTM D2240)

40-50 Shore

Elongation (ASTM D 412)

250%

Tensile Strength (ASTM D 412)

200 @ 100 mil L. Base Sheet: In accordance with Section 07591.

PART 3

EXECUTION

3.1

EXAMINATION

A. Verify that deck surfaces and project conditions are ready to receive work of this section.

B. Verify that deck is supported and secured to structural members.

C. Verify that deck is clean and smooth, free of depressions, projections or ripples, and is properly sloped to drains.

D. Verify that adjacent roof substrate components do not vary more than [one quarter (1/4)] inch in height.

E. Verify that deck surfaces are dry.

F. Verify that openings, curbs, pipes, conduit, sleeves, ducts and other items which penetrate the roof are set solidly and that [wood nailing strips are set in place.

A. GENERAL INSTALLATION REQUIREMENTS

A. Cooperate with manufacturer, inspection and test agencies engaged or required to perform services in connection with installing the roof system.

B. Insurance/Code Compliance: Where required by code, install and test the roofing system to comply with governing regulation and specified insurance requirements.

C. Protect other work from spillage of roofing materials and prevent materials from entering or clogging drains and conductors. Replace or restore other work damaged by installation of the modified bituminous roofing system.

D. Coordinate installation of roofing system components so that insulation and roofing plies are not exposed to precipitation or left exposed overnight. Provide cut-offs at end of each day’s work to cover exposed ply sheets and insulation with two (2) plies of #15 organic roofing felt set in roofing cement and with joints and edges sealed with roofing cement. Remove cut-offs immediately before resuming work.

E. Cold applied membrane adhesive coverage rates for interply application two (2) to two and a half (2 ½) gallons (7.5-9.4L) per one hundred (100) square feet (plus or minus twenty five (25) percent on total job average basis.

F. All insulation joints must be taped along with deck penetrations to prevent bitumen from penetrating substrate joints, entering building or damaging roofing system components or adjacent building construction by applying a tape barrier.

G. Apply roofing materials as specified by manufacturer’s instructions.

Keep roofing materials dry before and during application.

Do not permit phased construction.

Complete application of roofing plies, modified sheet and flashing in a continuous operation.

4.

Begin and apply only as much roofing in one day as can be completed that same day.

H. Cut-Offs (Waterstops): At end of each day’s roofing installation, protect exposed edge of incomplete work, including ply sheets and insulation. Provide temporary covering of two (2) plies of #15 organic roofing felt set in roofing cement with joints and edges sealed.

I. Broadcast minerals into the bleed out of bitumen to achieve uniform color throughout.

B. BASE PLY INSTALLATION

A. Tri-Base Plus Plies: Install (2) Fiberglass/Polyester/Fiberglass base sheets in two (2) to two and one half (2-1/2) gallons per square of cold applied membrane adhesive, shingled uniformly to achieve two plies throughout over the prepared substrate. Shingle in proper direction to shed water on each large area of roofing.

B. Lap ply sheet ends eight inches. Stagger end laps twelve inches minimum.

C. Extend plies two inches beyond top edges of cants at wall and projection bases.

D. Install base flashing ply to all perimeter and projection details.

E. Allow the two plies of base sheet to cure at least thirty minutes before installing the modified membrane. However, the modified membrane must be installed the same day as the base plies.

3.4

MODIFIED MEMBRANE APPLICATION

A. Solidly bonded to the base layers with specified cold adhesive at the rate of two (2) to two and one half (2-1/2) gallons per 100 square feet.

B. The roll must push a puddle of adhesive in front of it with adhesive slightly visible at all side laps. Care should be taken to eliminate air entrapment under the membrane.

C. Subsequent rolls of modified shall be installed across the roof as above with a minimum of four (4) side laps and eight (8) end laps. The end laps shall be staggered. The modified membrane shall be laid in the same direction as the under-layers but the laps shall not coincide with the laps of the base layers.

D. For best results, allow the cold adhesive to set for five (5) to ten (10) minutes before installing the top layer of modified membrane.

E. Extend membrane two (2) beyond top edge of all cants in full mopping of the cold adhesive as shown on the drawings.

1. FLASHING MEMBRANE INSTALLATION

A. Seal all curb, wall and parapet flashings with an application of mastic and mesh on a daily basis. Do not permit conditions to exist that will allow moisture to enter behind, around or under the roof or flashing membrane.

B. Prepare all walls, penetrations, expansion joints and where shown on the drawings to be flashed with asphalt primer at the rate of one hundred (100) square feet per gallon. Allow primer to dry tack free.

C. Use the modified membrane as the flashing membrane. Adhere to the underlying base flashing ply with specified asphalt unless otherwise noted in these specifications. Nail off at a minimum of eight (8) inches (203mm) o.c. from the finished roof at all vertical surfaces.

D. Solidly adhere the entire sheet of flashing membrane to the substrate. Tops of all flashings that are not run up and over curb shall be secured through termination bar 6 inches (152mm) and sealed at top. Seal all vertical laps of flashing membrane with a three-course application of trowel-grade mastic and fiberglass mesh.

E. Coordinate counter flashing, cap flashings, expansion joints and similar work with modified bitumen roofing work as specified in other sections.

F. Coordinate roof accessories, miscellaneous sheet metal accessory items, including piping vents and other devices with the roofing system work [as specified in other sections]. When using mineralized cap sheet all stripping shall be installed prior to cap sheet installation.

3.6

FLASHING MEMBRANE INSTALLATION

A. Coping Cap:

1. Minimum flashing height is eight (8) inches (203mm) above finished roof height. Maximum flashing height is 24 inches. Prime vertical wall at a rate of 100 square feet per gallon and allow to dry.

2. Set cant in bitumen. Run all field plies over cant a minimum of two (2) inches (50mm).

3. Attach tapered board to top of wall.

4. Install base flashing ply covering entire wall and wrapped over top of wall and down face with six (6) inches (152mm) on to field of roof and set in cold asphalt. Nail membrane at eight (8) inches (203mm) o.c.

5. Install a second ply of modified flashing ply in bitumen over the base flashing ply, nine (9) inches (228mm) on to the field of the roof. Apply a three-course application of mastic and mesh at all seams and allow to cure and aluminize.

6. Install continuous cleat and fasten at six (6) inches (152mm) o.c. to outside wall.

7. Install new metal coping cap hooked to continuous cleat.

8. Fasten inside cap 24 inches (609mm) o.c. with approved fasteners and neoprene washers.

B. Coping Cap [Generic Pre-manufactured]:

1. Minimum flashing height is eight (8) inches (203mm) above finished roof height. Maximum flashing height is 24 inches. Prime vertical wall at a rate of 100 square feet per gallon and allow to dry.

2. Set cant in bitumen. Run all field plies over cant a minimum of two (2) inches (50mm).

3. Install base flashing ply covering entire wall and wrapped over top of wall and down face with six (6) inches (152mm) on to field of the roof and set in cold asphalt. Nail membrane at eight (8) inches (203mm) o.c.

4. Install a second ply of modified flashing ply in bitumen over the base flashing ply, nine (9) inches (228mm) on to the field of the roof. Apply a three-course application of mastic and mesh at all seams and allow to cure and aluminize.

5. Install coping cap per manufacturer’s recommendations.

C. Base Flashing at Walls:

1. Inspect the nailer to assure proper attachment and configuration. The wood cant strip should be mechanically attached to the vertical and horizontal wood nailers.

2. Install compressible insulation in neoprene cradle between wall and vertical wood nailer.

3. Prime vertical wall at a rate of 100 square feet per gallon and allow to dry.

4. Install base flashing ply covering entire wall and wrapped to top of wood nailer with six (6) inches (152mm) on to field of the roof. Nail membrane through termination bar at eight (8) inches (203mm) o.c. and apply a three-course application of mastic and mesh at top edge.

5. Install a second ply of modified flashing ply in bitumen over the base flashing ply, nine (9) inches (228mm) on to the field of the roof. Apply a three-course application of mastic and mesh at all vertical seams and allow to cure and aluminize.

6. Install counter-flashing.

D. Exhaust Fan:

1. Minimum curb height is eight (8) inches (203mm) above finished roof height. Prime vertical at a rate of 100 square feet per gallon and allow to dry.

2. Set cant in bitumen. Run all plies over cant a minimum of two (2) inches (50mm).

3. Install base flashing ply covering curb with six (6) inches (152mm) on to field of the roof.

4. Install a second ply of modified flashing ply installed over the base flashing ply, nine (9) inches (228mm) on to field of the roof. Attach top of membrane to top of wood curb and nail at eight (8) inches (203mm) o.c. Apply a three-course application of mastic and mesh at all vertical seams and allow to cure and aluminize.

5. Install metal exhaust fan over the wood nailers and flashing to act as counter-flashing. Fasten per manufacturer’s recommendation.

E. Passive Vent/Air Intake:

1. Minimum curb height is eight (8) inches (203mm) above finished roof height. Prime vertical at a rate of 100 square feet per gallon and allow to dry.

2. Set cant in bitumen. Run all plies over cant a minimum of two (2) inches (50mm).

3. Install base flashing ply covering curb with six (6) inches (152mm) on to the field of the roof.

4. Install a second ply of modified flashing ply installed over the base flashing ply, nine (9) inches (228mm)on to field of the roof. Attach top of membrane to top of wood curb and nail at eight (8) inches (203mm) o.c. Apply a three-course application of mastic and mesh at all vertical seams and allow to cure and aluminize.

5. Install passive vent/air intake over the wood nailers and flashing to act as counter-flashing. Fasten per manufacturer’s recommendations.

F. Roof Drain:

1. Plug drain to prevent debris from entering plumbing.

2. Taper insulation to drain minimum of 24 inches (609mm) from center of drain.

3. Run roof system plies over drain. Cut out plies inside drain bowl.

4. Set lead/copper flashing (30 inch square minimum) in ¼ inch bed of mastic. Run lead/copper into drain a minimum of two (2) inches (50mm). Prime lead/copper at a rate of 100 square feet per gallon and allow to dry.

5. Install base flashing ply (40 inch square minimum) in bitumen.

6. Install modified membrane (48 inch square minimum) in bitumen.

7. Install clamping ring and assure that all plies are under the clamping ring.

8. Remove drain plug and install strainer.

G. Plumbing Stack:

1. Minimum stack height is 12 inches (609mm).

2. Run roof system over the entire surface of the roof. Seal the base of the stack with elastomeric sealant.

3. Prime flange of new sleeve. Install properly sized sleeves set in ¼ inch (6mm) bed of roof cement.

4. Install base flashing ply in bitumen.

5. Install membrane in bitumen.

6. Caulk the intersection of the membrane with elastomeric sealant. Turn sleeve a minimum of one (1) inch (25mm) down inside of stack.

H. Heat Stack:

1. Minimum stack height is 12 inches (609mm).

2. Run roof system over the entire surface of the roof. Seal the base of the stack with elastomeric sealant.

3. Prime flange of new sleeve. Install properly sized sleeves set in ¼ inch (6mm) bed of roof cement.

4. Install base flashing ply in bitumen.

5. Install modified membrane in bitumen.

6. Caulk the intersection of the membrane with elastomeric sealant.

7. Install new collar over cape. Weld collar or install stainless steel draw brand.

I. Pitch Pocket Umbrella [Detail No. MBC-53]:

1. Run all plies up to the penetration.

2. Place the pitch pocket over the penetration and prime all flanges.

3. Strip in flange of pitch pocket with one (1) ply of base flashing ply. Extend six (6) inches (152mm) onto field of roof.

4. Install second layer of modified membrane extending nine (9) inches (228mm) onto field of the roof.

5. Fill pitch pocket half full with non-shrink grout. Let this cure and top off with pourable sealant.

6. Caulk joint between roof system and pitch pocket with roof cement.

7. Place a water-shedding type bonnet over the top of the pitch pocket and clamp the top with a draw band collar. Caulk the upper edge of the band with an elastomeric sealant.

3.10 APPLICATION OF SURFACING

A. Mineral Surfaced Membrane System: While bleed out from the side and end laps are still cold, hand broadcast minerals into asphalt bleed out for a monolithic appearance. Aluminize any areas of improper adherence of minerals and rebroadcast minerals while coating is still wet.

3.11

FIELD QUALITY CONTROL

A. Perform field inspection and [and testing] as required [under provisions of Section 01410].

B. Correct defects or irregularities discovered during field inspection.

C. Require attendance of roofing [and insulation] materials manufacturers’ representatives at site during installation of the roofing system. A copy of the specification should be on site at all times.

3.12

CLEANING

A. Remove bitumen adhesive drippings from all walls, windows, floors, ladders and finished surfaces.

B. In areas where finished surfaces are soiled by asphalt or any other sources of soiling caused by work of this section, consult manufacturer of surfaces for cleaning instructions and conform to their instructions.

C. Repair or replace defaced or disfigured finishes caused by work of this section.

3.13 FINAL INSPECTION

A. At completion of roofing installation and associated work, meet with Contractor, Contracting Officer, installer, installer of associated work, Owner, roofing system manufacturer’s representative and other representatives directly concerned with performance of roofing system.

B. Walk roof surface areas of the building, inspect perimeter building edges as well as flashing of roof penetrations, walls, curbs and other equipment. List all items requiring correction or completion and furnish copy of list to each party in attendance.

C. The roofing system manufacturer reserves the right to request a thermographic scan of the roof during final inspection to determine if any damp or wet materials have been installed. The thermographic scan shall be provided by the [Roofing] Contractor at a negotiated price.

D. If core cuts verify the presence of damp or wet materials, the [Roofing] Contractor shall be required to replace the damaged areas at his own expense.

E. Repair or replace deteriorated or defective work found at time above inspection as required to a produce an installation which is free of damage and deterioration at time of Substantial Completion and according to warranty requirements.

F. Notify the Contracting Officer upon completion of corrections.

G. Following the final inspection, provide written notice of acceptance of the installation from the roofing system manufacturer.

END OF SECTION

Modified Bituminous Membrane Roofing

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