EXHIBIT_D_–_Cold_Applied_Asphalt_Roofing.pdf

Alameda County 224 West Winton Roof Replacement

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SECTION 07550

MODIFIED BITUMINOUS MEMBRANE ROOFING

PART 1 GENERAL

1.1 SECTION INCLUDES

A. SCOPE INCLUDES BUT NOT LIMITED TO: Cold Applied 2-Ply Solvent Free Asphalt Roofing

1. Contractor to provide stair tower scaffolding to lower roof section. Alameda County to provide set up location.

2. Remove and dispose of all solar, roofing, coping, edge metal, counterflashing, and associated materials down to the structural deck. Canopies attached to the buildings are also included.

3. All skylights to be replaced with new OSHA approved acrylic dome skylights.

4. All Passive vents to be replaced with new watertight Greenheck aluminum passive vent.

5. Inspect deck and perform repairs as needed.

6. Prior to construction, snake and test all drains to ensure that piping is free of debris and blockages and is flowing properly. Once roof is complete, retest drains.

7. Raise all curb flashings to a minimum 8” base flashing height.

8. Mechanically fasten a minimum R-10 polyiso insulation and ½” densdeck prime per manufacturers wind uplift calculations. Provide crickets as needed to ensure positive drainage throughout roof system.

9. Install new OMG Retrofit drains at all drain locations.

10. Install Flexbase Plus 80 in cold applied 0 VOC Green-Lock membrane adhesive.

11. Install Stressply Plus FR Mineral in cold applied 0 VOC Green-Lock membrane adhesive.

12. Install flashings with specified base sheet and cap sheet in cold applied 0 VOC

Green-Lock Flashing adhesive.

13. Allow roof to cure a minimum of 30 days.

14. At all drain and valley locations, apply partially reinforced Liquitec System.

a. At all valleys along crickets and at drain locations, apply a 4 foot wide application of Liquitec.

b. Apply 3 course of Liquitec and 6” polyester to all seams at a rate of 4 gallons per 100 square feet.

c. Apply a Liquitec Base coat at a rate of 2 gallons per square.

d. Apply a Liquitec Top coat at a rate of 2 gallons per square

15. Once cured, apply Pyramic Plus LO in 2 coats of 1.25 gallons per square. (2.5 gal per square total).

16. Install walkpads as indicated on aerial.

17. Install ANSI-SPRI ES-1 approved snap on R-Mer Force Coping in 22ga kynar coated steel.

18. Provide new counterflashing at all details, curbs, mechanical units, and terminations for a complete watertight system.

19. At Clere Story Location install R-mer Shield Standing Seam metal system per manufacturers shop drawings.

20. All conduit pipes to be installed on new Dura-Block Supports.

21. On upper roof section, prepare chimney cap at heat stack for coating restoration by wire brushing any flaking paint/rust so that the area is flake free. Once prepared, apply metal roof primer at 0.5 gallons per square and Liquitec in two coats of 1.5 gallons per square.

22. At all mechanical duct locations throughout roof area, apply a restoration system of Uni-bond, polyester, and Liquitec.

a. Clean duct and wire brush any rust so that it is flake free.

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b. Apply Metal Roof Primer at 0.5 gallons per square.

c. Apply Uni-Bond 6” to all metal to metal duct joints and seams. Saturate Uni-

Bond so polyester is not exposed to moisture with Liquitec at roughly 1 gallon per square.

d. Apply Liquitec to entire duct in two coats of 1.5 gallons per square.

e. At duct flexible flashings, span duct with loose polyester by embedding polyester in Liquitec at top and base of metal duct. Once set, coat polyester ensure it is water tight in two coats of Liquitec at 1 gallon per square.

23. Test all drains and downspouts prior to construction and once again after completion.

24. Provide county with single Manufacturers 30 year NDL warranty covering both the low slope and metal standing seam roofing and 5 year contractor workmanship warranty.

1.2 RELATED SECTIONS

A. Section 07 22 16 – Roof Insulation

B. Section 07 41 13 – Metal Roof Panels

C. Section 07 62 00 - Sheet Metal Flashing and Trim

1.3 REFERENCES

A. ASTM D 41 - Standard Specification for Asphalt Primer Used in Roofing, Dampproofing, and Waterproofing.

B. ASTM D 312 - Standard Specification for Asphalt used in Roofing.

C. ASTM D 451 - Standard Test Method for Sieve Analysis of Granular Mineral Surfacing for Asphalt Roofing Products.

D. ASTM D 1079 Standard Terminology Relating to Roofing, Waterproofing and Bituminous Materials.

E. ASTM D 2822 Standard Specification for Asphalt Roof Cement.

F. ASTM D 4601 Standard Specification for Asphalt Coated Glass Fiber Base Sheet Used in Roofing.

G. ASTM D 5147 Standard Test Method for Sampling and Testing Modified Bituminous Sheet Materials.

H. ASTM D 6162 Standard Specification for Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using a Combination of Polyester and Glass Fiber Reinforcements.

I. ASTM D 6757 - Standard Specification for Underlayment Felt Containing Inorganic Fibers Used in Steep-Slope Roofing.

J. ASTM E 108 - Standard Test Methods for Fire Test of Roof Coverings

K. Factory Mutual Research (FM): Roof Assembly Classifications.

L. National Roofing Contractors Association (NRCA): Roofing and Waterproofing Manual.

M. Sheet Metal and Air Conditioning Contractors National Association, Inc. (SMACNA) - Architectural Sheet Metal Manual.

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N. Underwriters Laboratories, Inc. (UL): Fire Hazard Classifications.

O. Warnock Hersey (WH): Fire Hazard Classifications.

P. ANSI-SPRI ES-1 Wind Design Standard for Edge Systems used with Low Slope Roofing Systems.

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

R. UL - Fire Resistance Directory.

S. FM Approvals - Roof Coverings and/or RoofNav assembly database.

T. California Title 24 Energy Efficient Standards.

1.4 DESIGN / PERFORMANCE REQUIREMENTS

A. Perform work in accordance with all federal, state and local codes.

B. Exterior Fire Test Exposure: Roof system shall achieve a UL, FM or WH Class rating for roof slopes indicated on the Drawings as follows:

1. Factory Mutual Class A Rating.

2. Underwriters Laboratory Class A Rating.

3. Warnock Hersey Class A Rating.

C. Design Requirements:

1. Uniform Wind Uplift Load Capacity

a. Installed roof system shall withstand negative (uplift) design wind loading pressures complying with the following criteria.

1) Design Code: ASCE 7-22.

2) Risk Category:

a) III.

3) Wind Speed: 99 mph

4) Exposure Category:

a) C.

5) Design Roof Height: 30 feet.

6) Roof Pitch: ¼” :12.

2. Live Load: 20 psf, or not to exceed original building design.

3. Dead Load:

a. Installation of new roofing materials shall not exceed the dead load capacity of the existing roof structure.

D. Energy Star: Roof System shall comply with the initial and aged reflectivity required by the U.S. Federal Government's Energy Star program.

E. Roof system shall have been tested in compliance with the following codes and test requirements:

1. Underwriters Laboratories:

a. Certification TGFU.R

2. Warnock Hersey

a. ITS Directory of Listed Products

3. FM Approvals:

a. RoofNav Website

1.5 SUBMITTALS

A. Submit under provisions of Section 01300.

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B. Product Data: Manufacturer's data sheets on each product to be used, including:

1. Preparation instructions and recommendations.

2. Storage and handling requirements and recommendations.

3. Installation instructions.

C. Specimen Warranty: Provide an unexecuted copy of the 30 year No Dollar Limit water tight warranty covering every part of the Built Up Roofing system specified for this project.

Warranty sample shall be sole source including modified bitumen, ANSI-SPRI ES-1 coping and edge metal, metal roof panels, and soffit panels.

D. Shop Drawings: Provide shop drawings designed by manufacturers engineering department showing roof plan, details, tapered insulation plan, and fastening patterns per code requirements.

E. Design Pressure Calculations: Submit design pressure calculations for the roof area in accordance with ASCE 7 and local Building Code requirements. Include a roof system attachment analysis report, certifying the system's compliance with applicable wind load requirements before Work begins. Report shall be signed and sealed by a Professional Engineer registered in the State of the Project who has provided roof system attachment analysis for not less than 5 consecutive years.

F. Any material submitted as equal to or better than the specified material must be accompanied by a report signed and sealed by a professional engineer licensed in the state in which the installation is to take place. This report shall show that the submitted equal meets the Design and Performance criteria in this specification. Material substitutions may only be submitted by prime bidding contractors. Substitution requests submitted without a licensed engineer stamp or by non-prime bidding contractors will be rejected for non-conformance.

G. Verification Samples: For each modified bituminous membrane ply product specified, two samples, minimum size 6 inches (150 mm) square, representing actual product, color, and patterns.

H. Manufacturer's Certificates: Provide to certify products meet or exceed specified requirements.

I. Manufacturer’s Contractor Authorization: Provide written authorization acknowledgement from the roofing system manufacturer that the applicator is currently authorized to install the specified roof system and able to provide the specified warranty. Manufacturer’s acknowledgement letter must be dated within one (1) year of the bid date.

J. Test Reports: Submit test reports, prepared by an independent testing agency, for all modified bituminous sheet roofing, indicating compliance with ASTM D5147. Testing must be performed at 77 deg. F. Tests at 0 deg. F will not be considered.

K. Manufacturer's Fire Compliance Certificate: Certify that the roof system furnished is approved by Factory Mutual (FM), Underwritters Laboratories (UL), Warnock Hersey (WH) or approved third party testing facility in accordance with ASTM E108, Class A for external fire and meets local or nationally recognized building codes.

L. Manufacturers Field Inspections: Provide a notarized statement from the roofing system manufacturer, signed by an officer of the corporation stating that the roof system manufacturer will provide filed inspections three times a week during the entire period of installation until all construction is completed and to be performed by a full time employee of the manufacturer at no additional cost to the owner.

M. Closeout Submittals: Provide manufacturer's maintenance instructions that include

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Provide product warranty executed by the manufacturer. 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.

1.6 QUALITY ASSURANCE

A. Perform Work in accordance with NRCA Roofing and Waterproofing Manual.

B. Manufacturer Qualifications: Company specializing in manufacturing products specified with documented ISO 9001 certification and minimum of twelve years of documented experience and must not have been in Chapter 11 bankruptcy during the last ten years.

C. Installer Qualifications: Company specializing in performing Work of this section with minimum five years documented experience and a certified Authorized Applicator with the specified manufacturer.

D. Installer's Field Supervision: Maintain a full-time Supervisor/Foreman on job site during all phases of roofing work while roofing work is in progress.

E. Product Certification: Provide manufacturer's certification 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.

F. Source Limitations: Obtain all components of roof system from a single manufacturer. All modified bitumen, edge metal, and gutters are part of the roof system and must be sole sourced. Secondary products that are required shall be recommended and approved in writing by the roofing system Manufacturer. Upon request of the Architect or Owner, submit Manufacturer's written approval of secondary components in list form, signed by an authorized agent of the Manufacturer.

1.7 PRE-INSTALLATION MEETINGS

A. Convene minimum two weeks prior to commencing Work of this section.

B. Review installation procedures and coordination required with related Work.

C. Inspect and make notes of job conditions prior to installation:

1. Record minutes of the conference and provide copies to all parties present.

2. Identify all outstanding issues in writing designating the responsible party for follow-up action and the timetable for completion.

3. Installation of roofing system shall not begin until all outstanding issues are resolved to the satisfaction of the Architect.

1.8 DELIVERY, STORAGE, AND HANDLING

A. Deliver and store products in manufacturer's unopened packaging with labels intact until ready for installation.

B. Store all roofing materials in a dry place, on pallets or raised platforms, out of direct exposure to the elements until time of application. Store materials at least 4 inches above ground level and covered with "breathable" tarpaulins.

C. Stored in accordance with the instructions of the manufacturer prior to their application or installation. Store roll goods on end on a clean flat surface. No wet or damaged materials will be used in the application.

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D. Store at room temperature wherever possible, until immediately prior to installing the roll.

During winter, store materials in a heated location with a 50 degree F (10 degree C) minimum temperature, removed only as needed for immediate use. Keep materials away from open flame or welding sparks.

E. Avoid stockpiling of materials on roofs without first obtaining acceptance from the Architect/Engineer.

F. Adhesive storage shall be between the range of above 40 degree F (4 degree C) and below 80 degree F (27 degree C). Area of storage shall be constructed for flammable storage.

1.9 COORDINATION

A. Coordinate Work with installing associated metal flashings as work of this section proceeds.

1.10 PROJECT CONDITIONS

A. Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacturer's absolute limits.

1.11 WARRANTY

A. Upon completion of the work, provide the Manufacturer's written and signed NDL Warranty, warranting that, if a leak develops in the roof during the term of this warranty, due either to defective material or defective workmanship by the installing contractor, the manufacturer shall provide the Owner, at the Manufacturer's expense, with the labor and material necessary to return the defective area to a watertight condition.

1. Warranty Details:

a. 30 years from date of acceptance.

b. Warranty shall cover the calculated windspeed of 105 mph.

c. All components of the new roof system including: primer, mastic, mesh, coatings, modified sheets, Standing Seam Metal Roof Panels, and ANSI-SPRI ES-1 edge metal shall be manufactured by a single source manufacturer and covered under a sole source warranty.

B. Installer is to guarantee all work against defects in materials and workmanship for a period indicated following final acceptance of the Work.

1. Warranty Period:

a. 5 years from date of acceptance.

PART 2 PRODUCTS

2.1 MANUFACTURERS

A. Basis of Design: Garland Company, Inc. (The), which is located at: 3800 E. 91st St.;

Cleveland, OH 44105; Toll Free Tel: 800-321-9336; Tel: 216-641-7500; Fax: 216-641-0633;

1. Local Representative – Doug Clark - Email: dclark@garlandind.com (925) 784-6701.

a. OR APPROVED EQUAL.

B. The Products specified are intended and the Standard of Quality for the products required for this project. Substitution requests must be made ten (10) days prior to bid date and be approved by Alameda County. Any substitutions made after the 10 day period will not be reviewed or accepted. Any materials substituted must be equal to the performance requirements listed in this specification. If no manufacturer and products are listed, the bid is accepted only with the use of products specified.

1. Bidder will not be allowed to change materials after the bid opening date.

2. If alternate products are included in the bid, the products must be equal to or exceed mailto:dclark@garlandind.com

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3. In making a request for substitution, the Bidder/Roofing Contractor represents that it has:

a. Personally investigated the proposed product or method, and determined that it is equal or superior in all respects to that specified.

b. Will provide the same guarantee for substitution as for the product and method specified.

c. Will coordinate installation of accepted substitution in work, making such changes as may be required for work to be completed in all respects.

d. Will waive all claims for additional cost related to substitution, which consequently become apparent.

e. Cost data is complete and includes all related cost under his/her contract or other contracts, which may be affected by the substitution.

f. Will reimburse the Owner for all redesign cost by the Architect or other third parties for accommodation of the substitution.

4. Architect/ Owner reserves the right to be the final authority on the acceptance or rejection of any or all bids, proposed alternate roofing systems or materials that has met ALL specified requirement criteria.

5. Failure to submit substitution package, or any portion thereof requested, will result in immediate disqualification and consideration for that particular contractors request for manufacturer substitution.

2.2 COLD APPLIED 2-PLY SOLVENT FREE ASPHALT ROOFING

A. Base (Ply) Sheet: One ply bonded to the prepared substrate with Interply Adhesive:

1. Flexbase Plus 80:

B. Modified Cap (Ply) Sheet: One ply bonded to the prepared substrate with interplay adhesive.

1. StressPly Plus FR Mineral:

C. Interply Adhesive: (Layer 1 and 2)

1. Green-Lock Membrane Adhesive:

D. Flashing Base Ply: One ply bonded to the prepared substrate with Interply Adhesive: except torch sheet.

1. Flexbase Plus 80:

E. Flashing Cap (Ply) Sheet: One ply bonded to the prepared substrate with Interply Adhesive:

except torch sheet.

1. StressPly Plus FR Mineral:

F. Flashing Ply Adhesive:

1. Green-Lock Flashing Adhesive:

G. Reflective Coating

1. Pyramic Plus LO

2.3 ACCESSORIES:

A. Roof Insulation: In accordance with Section 07 22 00.

B. Insulation Adhesive: Insul-Lock HR

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;

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07550-8 and stainless steel nails shall be used with stainless steel, Fasteners shall be self-clinching type of penetrating type as recommended by the deck manufacturer. Fasten nails and fasteners flush-driven through flat metal discs not less than 1 inch (25 mm) diameter. Omit metal discs when one-piece composite nails or fasteners with heads not less than 1 inch (25

mm) diameter are used.

D. Sealant - Green-Lock Structural Adhesive: Single component, 100% solids structural adhesive as furnished and recommended by the membrane manufacturer.

1. Elongation, ASTM D 412: 300%

2. Hardness, Shore A, ASTM C 920: 50

3. Shear Strength, ASTM D 1002: 300 psi

2.4 EDGE TREATMENT AND ROOF PENETRATION FLASHINGS

A. Vents and Breathers: Heavy gauge aluminum and fully insulated vent that allows moisture and air to escape but not enter the roof system as recommended and furnished by the membrane manufacturer.

B. Drain Flashings should be Green-Weld PVB

1. Green-Weld Adhesive

C. Plumbing stacks should be Green-Weld PVB

1. Green-Weld Adhesive

D. Fabricated Flashings: Fabricated flashings and trim are specified in Section 07620.

1. All metal trim to be supplied to meet ANSI-SPRI ES-1

E. Manufactured Roof Specialties: Manufactured copings, fascia, gravel stops, control joints, expansion joints, joint covers and related flashings and trim are specified in Section 07710.

1. Manufactured roof specialties shall conform to the detail requirements of SMACNA

"Architectural Sheet Metal Manual" and/or the NRCA "Roofing and Waterproofing Manual" as applicable.

F. Coping and Edge Metal: R-Mer Force Coping and R-Mer Drip Edge

1. 22 Gauge kynar coated metal.

PART 3 EXECUTION

3.1 EXAMINATION

A. Do not begin installation until substrates have been properly prepared.

B. Inspect and approve the deck condition, slopes and fastener backing if applicable, parapet walls, expansion joints, roof drains, stack vents, vent outlets, nailers and surfaces and elements.

C. Verify that work penetrating the roof deck, or which may otherwise affect the roofing, has been properly completed.

D. If substrate preparation and other conditions are the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.

3.2 PREPARATION

A. General: Clean surfaces thoroughly prior to installation.

1. Prepare surfaces using the methods recommended by the manufacturer for achieving the best result for the substrate under the project conditions.

2. Fill substrate surface voids that are greater than 1/4 inch wide with an acceptable fill

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3. Roof surface to receive roofing system shall be smooth, clean, free from loose gravel, dirt and debris, dry and structurally sound.

4. Wherever necessary, all surfaces to receive roofing materials shall be power broom and vacuumed to remove debris and loose matter prior to starting work.

5. Do not apply roofing during inclement weather. Do not apply roofing membrane to damp, frozen, dirty, or dusty surfaces.

6. Fasteners and plates for fastening components mechanically to the substrate shall provide a minimum pull-out capacity of 300 lbs. (136 k) per fastener. Base or ply sheets attached with cap nails require a minimum pullout capacity of 40 lb. per nail.

3.3 INSTALLATION - GENERAL

A. Install modified bitumen membranes and flashings in accordance with manufacturer's instructions and with the recommendations provided by the National Roofing Contractors Association's Roofing & Waterproofing Manual, the Asphalt Roofing Manufacturers Association, and applicable codes.

B. General: Avoid installation of modified bitumen membranes at temperatures lower than 40- 45 degrees F. When work at such temperatures unavoidable use the following precautions:

1. Take extra care during cold weather installation and when ambient temperatures are affected by wind or humidity, to ensure adequate bonding is achieved between the surfaces to be joined. Use extra care at material seam welds and where adhesion of the applied product to the appropriately prepared substrate as the substrate can be affected by such temperature constraints as well.

2. Unrolling of cold materials, under low ambient conditions must be avoided to prevent the likelihood of unnecessary stress cracking. Rolls must be at least 40 degrees F at the time of application. If the membrane roll becomes stiff or difficult to install, it must be replaced with roll from a heated storage area.

C. Commence installation of the roofing system at the lowest point of the roof (or roof area), working up the slope toward the highest point. Lap sheets shingle fashion so as to constantly shed water

D. All slopes greater than 2:12 require back-nailing to prevent slippage of the ply sheets. Use ring or spiral-shank 1 inch cap nails, or screws and plates at a rate of 1 fastener per ply (including the membrane) at each insulation stop. Place insulation stops at 16 ft o.c. for slopes less than 3:12 and 4 feet 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 2:12, install all plies parallel to the slope (strapping) to facilitate backnailing. Install 4 additional fasteners at the upper edge of the membrane when strapping the plies.

3.4 INSTALLATION COLD APPLIED ROOF SYSTEM

A. Base Ply: Cut base ply sheets into 18-foot lengths and allow plies to relax before installing.

Install base sheet in interply adhesive applied at the rate required by the manufacturer.

Shingle base sheets uniformly to achieve one ply throughout over the prepared substrate.

Shingle in proper direction to shed water on each large area of roofing.

1. Lap ply sheet ends 8 inches. Stagger end laps 12 inches minimum.

2. Solidly bond to the substrate and adjacent ply with specified cold adhesive at the rate of 2.5 gallons per 100 square feet.

3. Roll must push a puddle of adhesive in front of it with adhesive slightly visible at all side laps. Use care to eliminate air entrapment under the membrane.

4. Install subsequent rolls of modified across the roof as above with a minimum of 4-inch side laps and 8-inch staggered end laps. Lay modified membrane in the same direction as the underlayers but the laps shall not coincide with the laps of the base layers.

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5. Extend plies 2 inches beyond top edges of cants at wall and projection bases.

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

7. Allow the one ply of base sheet to cure at least 30 minutes before installing the modified membrane. However, the modified membrane must be installed the same day as the base plies.

B. Modified Cap Ply(s): Cut cap ply sheets into 18 foot lengths and allow plies to relax before installing. Install in interplay adhesive applied at the rate required by the manufacturer.

Shingle sheets uniformly over the prepared substrate to achieve the number of plys specified. Shingle in proper direction to shed water on each large area of roofing.

1. Lap ply sheet ends 8 inches. Stagger end laps 12 inches minimum.

2. Solidly bond to the base layers with specified cold adhesive at the rate of 2.5 gallons per 100 square feet.

3. 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.

4. Install subsequent rolls of modified across the roof as above with a minimum of 4 inch side laps and 8 inch staggered end laps. Lay modified membrane in the same direction as the underlayers but the laps shall not coincide with the laps of the base layers.

5. Allow cold adhesive to set for 5 to 10 minutes before installing the top layer of modified membrane.

6. Extend membrane 2 inches beyond top edge of all cants in full moppings of the cold adhesive as shown on the Drawings.

C. Fibrous Cant Strips: Provide non-combustible perlite or glass fiber cant strips at all wall/curb detail treatments where angle changes are greater than 45 degrees. Cant may be set in approved cold adhesives, hot asphalt or mechanically attached with approved plates and fasteners.

D. Wood Blocking, Nailers and Cant Strips: Provide wood blocking, nailers and cant strips as specified in Section 06114.

1. Provide nailers at all roof perimeters and penetrations for fastening membrane flashings and sheet metal components.

2. Wood nailers should match the height of any insulation, providing a smooth and even transition between flashing and insulation areas.

3. Nailer lengths should be spaced with a minimum 1/8 inch gap for expansion and contraction between each length or change of direction.

4. Nailers and flashings should be fastened in accordance with Factory Mutual "Loss

Prevention Data Sheet 1- 49, Perimeter Flashing" and be designed to be capable of resisting a minimum force of 200 lbs/lineal foot in any direction.

E. Metal Work: Provide metal flashings, counter flashings, parapet coping caps and thru-wall flashings as specified in Section 07620 or Section 07710. Install in accordance with the SMACNA "Architectural Sheet Metal Manual" or the NRCA Roofing Waterproofing manual.

F. Termination Bar: Provide a metal termination bar or approved top edge securement at the terminus of all flashing sheets at walls and curbs. Fasten the bar a minimum of 8 inches (203

mm) o/c to achieve constant compression. Provide suitable, sealant at the top edge if required.

G. Flashing Base Ply: Install flashing sheets by the same application method used for the base ply.

1. Seal 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.

2. Prepare all walls, penetrations, expansion joints and where shown on the Drawings to be flashed with required primer at the rate of 100 square feet per gallon. Allow primer

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3. Adhere to the underlying base ply with specified flashing ply adhesive unless otherwise specified. Nail off at a minimum of 8 inches (203 mm) o.c. from the finished roof at all vertical surfaces.

4. Solidly adhere the entire flashing ply to the substrate. Secure the tops of all flashings that are not run up and over curb through termination bar fastened at 6 inches (152

mm) O.C. and sealed at top.

5. Seal all vertical laps of flashing ply with a three-course application of trowel-grade mastic and fiberglass mesh.

6. Coordinate counter flashing, cap flashings, expansion joints and similar work with modified bitumen roofing work as specified.

7. Coordinate roof accessories, miscellaneous sheet metal accessory items, including piping vents and other devices with the roofing system work.

8. Secure the top edge of the flashing sheet using a termination bar only when the wall surface above is waterproofed, or nailed 4 inches on center and covered with an acceptable counter flashing.

H. Flashing Cap Ply: Install flashing cap sheets by the same application method used for the base ply.

1. Seal 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.

2. Prepare all walls, penetrations, expansion joints and where shown on the Drawings to be flashed with required primer at the rate of 100 square feet per gallon. Allow primer to dry tack free.

3. Adhere to the underlying base flashing ply with specified flashing ply adhesive unless otherwise specified. Nail off at a minimum of 8 inches (203 mm) o.c. from the finished roof at all vertical surfaces.

4. Coordinate counter flashing, cap flashings, expansion joints and similar work with modified bitumen roofing work as specified.

5. Coordinate roof accessories, miscellaneous sheet metal accessory items with the roofing system work.

6. All stripping shall be installed prior to flashing cap sheet installation.

7. Heat and scrape granules when welding or adhering at cut areas and seams to granular surfaces at all flashings.

8. Secure the top edge of the flashing sheet using a termination bar only when the wall surface above is waterproofed, or nailed 4 inches on center and covered with an acceptable counter flashing.

I. Surface Coatings: Apply specified coating once the roof membrane has fully cured. Apply base coat at a rate of 1.5 gallons per 100 square feet and allow to cure. Then apply top coat at a rate of 1.5 gallons per 100 square feet.

J. Roof Walkways: Provide walkways in areas indicated on the Drawings.

3.5 INSTALLATION EDGE TREATMENT AND ROOF PENETRATION FLASHING

A. Roof Edge With Gutter:

1. Inspect the nailer to ensure proper attachment and configuration. Increase slope at metal edge by additional degree of slope in first board.

2. Run one ply over the edge. Assure coverage of all wood nailers. Fasten plies with ring shank nails at 8 inches (203 mm) o.c.

3. Install gutter and strapping.

4. Install continuous cleat and fasten at 6 inches (152 mm) o.c.

5. Install new metal edge hooked to continuous cleat and set in bed of roof cement.

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Fasten flange to wood nailer every 3 inches (76 mm) o.c. staggered.

6. Prime metal edge at a rate of 100 square feet per gallon and allow to dry. Do not prime for Green-Lock System lightly sand metal to improve bond.

7. Strip in flange with base flashing ply covering entire flange in bitumen or adhesive with

6 inches (152 mm) onto the field of the roof. Assure ply laps do not coincide with metal laps.

8. Install a second ply of modified flashing ply in bitumen or adhesive over the base flashing ply, 9 inches (228 mm) onto the field of the roof.

B. Pre-manufactured Snap-On Coping Cap:

1. Install miters first.

2. Position base flashing of the Built-Up and/or Modified Roofing membrane over the wall edge covering nailers completely, fastening 8 inches o.c.. Install membrane and cap sheet with proper material and procedure according to manufacturer's recommendations.

3. Install minimum 16-gauge, 16 inch long by specified width anchor chair at [Contact Garland Representative] feet on center.

4. Install 6-inch-wide splice plate by centering over 16 inch long by specified width anchor chair. Apply two beads of sealant to either side of the splice plate's center.

Approximately 2 inches from the coping cap joint. Install Coping Cap by hooking outside hem of coping on outside face of anchor chair. Press downward on inside edge of coping until "snap" occurs and hem is engaged on the entire chair.

C. Curb Detail/Air Handling Station:

1. Minimum curb height is 8 inches (203 mm) 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 field plies over cant a minimum of 2 inches (50 mm).

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

4. Install a second ply of modified flashing ply in bitumen over the base flashing ply, 9 inches (228 mm) 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.

5. Install pre-manufactured counterflashing with fasteners and neoprene washers or per manufacturer's recommendations.

6. Set equipment on neoprene pad and fasten as required by equipment manufacturer.

D. Roof Drain:

1. Plug drain to prevent debris from entering plumbing.

2. Taper insulation to drain minimum of 24 inches (609 mm) 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 1/4 inch bed of mastic. Run lead/copper into drain a minimum of 2 inches (50 mm). 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.

E. Scupper Through Wall (Overflow):

1. Inspect the nailer to ensure proper attachment and configuration.

2. Run one ply over nailer up the overflow, into the scupper hole and up flashing as in typical wall flashing detail. Assure coverage of all wood nailers.

3. Install scupper box in a 1/4-inch (6 mm) bed of mastic. Assure all box seams are soldered and have a minimum 4-inch (101 mm) flange. Make sure all corners are closed and soldered. Prime scupper at a rate of 100 square feet per gallon and allow to dry.

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07550-13

4. Fasten flange of scupper box every 3 inches (76 mm) o.c. staggered.

5. Strip in flange scupper box with base flashing ply covering entire area with 6 inch (152

mm) overlap on to the field of the roof and wall flashing.

6. Install a second ply of modified flashing ply in bitumen or adhesive over the base flashing ply, 9 inches (228 mm) onto the field of the roof. Apply a three-course application of mastic and mesh at all seams.

F. Plumbing Stack:

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

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 1/4 inch (6 mm) 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.

7. Turn sleeve a minimum of 1 inch (25 mm) down inside of stack.

G. Skylight With Protection Screen:

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

2. Set cant in bitumen or adhesive. Run all field plies over cant a minimum of 2 inches

(50 mm).

3. Install base flashing ply covering curb set in bitumen or adhesive with 6 inches (152

mm) onto field of the roof.

4. Install a second ply of modified flashing ply in bitumen or adhesive over the base flashing ply, 9 inches (228 mm) onto the field of the roof. Attach top of membrane to top of wood nailer and apply a three-course application of mastic and mesh. Allow to cure and aluminize.

5. Install pre-manufactured lens and fasten flashing sides at 8 inches (203 mm) o.c. with fasteners and neoprene washers.

6. Install OSHA compliant, compression mounted skylight protection screen per membranes manufacturer's written instructions.

H. Exhaust Fan:

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

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

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

4. Install a second ply of modified flashing ply installed over the base flashing ply, 9 inches (228 mm) onto field of the roof. Attach top of membrane to top of wood curb and nail at 8 inches (203 mm) 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 counterflashing.

Fasten per manufacturer's recommendation.

I. Passive Vent/Air Intake:

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

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

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

4. Install a second ply of modified flashing ply installed over the base flashing ply, 9 inches (228 mm) onto field of the roof. Attach top of membrane to top of wood curb and nail at 8 inches (203 mm) o.c. Apply a three-course application of mastic and

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07550-14 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 counterflashing. Fasten per manufacturer's recommendations.

3.6 PROTECTION

A. Provide traffic ways, erect barriers, fences, guards, rails, enclosures, chutes and the like to protect personnel, roofs and structures, vehicles and utilities.

B. Protect exposed surfaces of finished walls with tarps to prevent damage.

C. Plywood for traffic ways required for material movement over existing roofs shall be not less than 5/8 inch (16 mm) thick.

D. In addition to the plywood listed above, an underlayment of minimum 1/2 inch (13 mm) recover board is required on new roofing.

E. Special permission shall be obtained from the Manufacturer before any traffic shall be permitted over new roofing.

3.7 FIELD QUALITY CONTROL

A. Inspection: Provide manufacturer's field observations a minimum of 3 times per week.

Provide a final inspection upon completion of the Work.

1. Warranty shall be issued upon manufacturer's acceptance of the installation.

2. Field observations shall be performed by a Technical Representative employed full-time by the manufacturer and whose primary job description is to assist, inspect and approve membrane installations for the manufacturer.

3. Provide observation reports from the Technical Representative indicating procedures followed, weather conditions and any discrepancies found during inspection.

4. Provide a final report from the Technical Representative, certifying that the roofing system has been satisfactorily installed according to the project specifications, approved details and good general roofing practice.

END OF SECTION