SolicitationAttachment11_07600FlashingAndSheetmetal_1232SA261448.pdf

BUILDING 20 & 24 METAL PANEL REPAIRS

SECTION 07600

FLASHING AND SHEET METAL

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only. Use the latest approved revision.

ASTM INTERNATIONAL (ASTM)

ASTM A 666 Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat Bar

ASTM B 209 Aluminum and Aluminum-Alloy Sheet and Plate

ASTM D 2822 Asphalt Roof Cement

ASTM E 154 Water Vapor Retarders Used in Contact with Earth Under Concrete Slabs, on Walls, or as Ground Cover

ORGANIZATION NAME (ACRONYM)

IDENTIFIER (date) Title

SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION

(SMACNA)

SMACNA Arch. Manual Architectural Sheet Metal Manual

THE SOCIETY FOR PROTECTIVE COATINGS (SSPC)

SSPC Paint 12 Cold-Applied Asphalt Mastic (Extra Thick Film)

1.2 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for Contractor Quality Control approval. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government.

SD-02 Shop Drawings

Sheet Metal; G

Shop drawings showing layout, profiles, methods of joining, and anchorages details.

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SD-04 Samples

Finish; G

1.3 SUMMARY

This Section includes the following:

Metal counter flashing.

Metal coping caps.

Scuppers.

Conductors Downspouts.

Miscellaneous sheet metal accessories.

1.4 GENERAL REQUIREMENTS

Sheet metalwork shall be accomplished to form weathertight construction without waves, warps, buckles, fastening stresses or distortion, and shall allow for expansion and contraction. Cutting, fitting, drilling, and other operations in connection with sheet metal required to accommodate the work of other trades shall be performed by sheet metal mechanics. Installation of sheet metal items used in conjunction with roofing shall be coordinated with roofing work to permit continuous roofing operations.

1.5 PROJECT CONDITIONS

Coordinate work of this section with interfacing and adjoining work for proper sequencing of each installation. Ensure best possible weather resistance and durability of work and protection of materials and finishes.

1.6 DELIVERY, HANDLING, AND STORAGE

Package and protect materials during shipment. Uncrate and inspect materials for damage, dampness, and wet-storage stains upon delivery to the job site. Remove from the site and replace damaged materials that cannot be restored to like-new condition. Handle sheet metal items to avoid damage to surfaces, edges, and ends. Store materials in dry, weather-tight, ventilated areas until immediately before installation.

PART 2 PRODUCTS

2.1 SHEET METAL FLASHING AND TRIM MATERIALS

2.1.1 Prefinished Sheet Metal:

2.1.1.1 Metal, 24 gauge.

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2.1.1.2 Finish

Primed and finished one side with fluoropolymer coating, containing 70 % polyvinylidene (PVF2) resin, 10. plus or minus 0.1 mil total dry film thickness. A wash coat, having a dry film thickness of 0.3 - 0.4 mils shall be applied to the unfinished side of the sheet metal. Kynar or equivalent.

2.1.1.3 Protection

Finished surfaces shall be protected with a strippable plastic film.

2.1.1.4 Color

White.

2.2 MISCELLANEOUS MATERIALS AND ACCESSORIES

2.2.1 Fasteners

Same metal as flashing/sheet metal or other non- corrosive metal as recommended by sheet manufacturer. Match finish of exposed heads with material being fastened.

2.2.2 Bituminous Coating

SSPC Paint 12, solvent-type bituminous mastic, nominally free of sulfur, compounded for 15-mil dry film thickness per coat.

2.2.3 Mastic Sealant

Polyisobutylene; nonhardening, nonskinning, non- drying, nonmigrating sealant.

2.2.4 Elastomeric Sealant

Generic type recommended by manufacturer of metal and fabricator of components being sealed and complying with requirements for joint sealants as specified in Division 7 Section "Joint Sealers".

2.2.5 Paper Slip Sheet

5-lb.rosin-sized building paper.

2.2.6 Polyethylene Underlayment

Minimum 6-mil carbonated polyethylene film resistant to decay when tested in accordance with ASTM E 154.

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2.2.7 Reglets

Metal or plastic units of type and profile indicated, compatible with flashing indicated, noncorrosive.

2.2.8 Metal Accessories

Provide sheet metal clips, straps, anchoring devices, continuous cleats, and similar accessory units as required for installation of work, matching or compatible with material being installed, noncorrosive, size and gage required for performance.

2.2.9 Roofing Cement

ASTM D 2822, asphaltic.

2.3 FABRICATION

2.3.1 General Metal Fabrication

Shop-fabricate work to greatest extent possible. Comply with details shown and with applicable requirements of SMACNA Arch. Manual and other recognized industry practices. Fabricate for waterproof and weather-resistant performance, with expansion provisions for running work, sufficient to permanently prevent leakage, damage, or deterioration of the work. Form work to fit substrates. Comply with material manufacturer instructions and recommendations for forming material. Form exposed sheet metal work without excessive oil-canning, buckling, and tool marks, true to line and levels indicated, with exposed edges folded back to form hems.

2.3.2 Seams

Fabricate nonmoving seams in sheet metal with flat-lock seams.

2.3.3 Expansion Provisions

Where lapped or bayonet-type expansion provisions in work cannot be used or would not be sufficiently water/weatherproof, form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with mastic sealant (concealed within joints). Provide for thermal expansion of all sheet metal work exceeding 15'-0" running length.

2.3.3.1 Spacing

10'-0" maximum, and located 2'-0" from corners and intersections.

2.3.4 Sealant Joints

Where movable, nonexpansion type joints are indicated or required for proper performance of work, form metal to provide for proper installation of elastomeric sealant, in compliance with SMACNA standards.

2.3.5 Separations

Provide for separation of metal from noncompatible metal or corrosive substrates by coating concealed surfaces at locations of contact, with bituminous coating or other permanent separation as recommended by manufacturer/fabricator.

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PART 3 EXECUTION

3.1 INSTALLATION REQUIREMENTS

3.1.1 General

Except as otherwise indicated, comply with manufacturer's installation instructions and recommendations and with SMACNA Arch. Manual. Anchor units of work securely in place by methods indicated, or if methods are not indicated on drawings, anchor units firmly in place with anchorage devices appropriate to the substrate. Space anchors to adequately resist lateral and thermal stresses as well as inward and outward pressures, but not more than 18 inches on center. Provide for thermal expansion of metal units.

Conceal fasteners where possible. Set units true to line and level as indicated. Install work with laps, joints, and seams that will be permanently watertight and weatherproof. Use continous cleats for installation of coping caps and fascias, etc.

3.1.2 Flashings

Flashing installed into reglets or saw cuts shall be secured with lead wedges or plugs spaced not to exceed 8 inches o.c. Completely fill saw cuts with sealant.

3.1.3 Underlayment

Where sheet metal is to be installed directly on cementitious or wood substrates, install a slip sheet of red rosin paper and a course of polyethylene underlayment.

3.1.4 Flanges

Bed flanges of work in a thick coat of bituminous roofing cement where required for waterproof performance.

3.2 CLEANING AND PROTECTION

3.2.1 Cleaning

Clean exposed metal surfaces, removing substances that might cause corrosion of metal or deterioration of finishes.

3.2.2 Protection

Advise Contractor of required procedures for surveillance and protection of flashings and sheet metal work during construction to ensure that work will be without damage or deterioration other than natural weathering at time of Substantial Completion.

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2.1.2 Stainless Steel Sheet