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   PART 1 - GENERAL

    01 SECTION INCLUDES

    A. Miscellaneous shop-fabricated sheet metal items as required to complete the work of this project, including the following:

    1. Counter flashing and base flashing (if any).

    2. Wall flashing.

    3. Built-in metal valleys, gutters, and scuppers.

    4. Gutters and downspouts (rain drainage).

    5. Exposed metal trim/fascia units.

    6. Miscellaneous sheet metal accessories.

    7. Gravel guards.

    1.02 REFERENCE STANDARDS

    A. AA - Aluminum Construction Manual: Aluminum Sheet Metal Work and Building Construction.

    B. ANSI/ASTM B32 - Specification for Solder Metal.

    C. ASTM A167 - Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet and Strip.

    D. ASTM B209 - Specification for Aluminum and Aluminum Alloy Sheet and Plate.

    E. ASTM B370 - Specification for Copper Sheet and Strip for Building Construction.

    F. ASTM A526 - Specification for Steel Sheet, Zinc Coated (Galvanized) by Hot Dip Process, Commercial Quality.

    G. ASTM A527 - Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process, Lock-Forming Quality.

    H. ASTM D2822 - Standard Specification for Asphalt Roof Cement.

    I. SMACNA - Architectural Sheet Metal Manual.

    J. NRCA - Roofing Manual.

    K. NAAMM - Metal Finishes Handbook.

    L. AISI - Stainless Steel - Uses in Architecture.

    M. CDA - Copper Roofing - A Practical Handbook.

    1.03 QUALITY ASSURANCE

    A. The work of this section shall be performed by a firm specializing in sheet metal flashing work with a minimum of five years of successful experience.

    1.04 SUBMITTALS

    A. General: Submit the following in accordance with Section 01340.

    B. Product Data: Manufacturer's product data and installation instructions including description of factory-finished sheet metal and type of guarantee.

    C. Samples:

    1. 12-inch long samples of shop fabricated products with specified factory finish.

    D. Shop Drawings: Indicating layout, profiles, methods of joining, and anchorages details, including major counterflashings, trim/fascia units, gutters, downspouts, and scuppers.

    1. Provide layouts at 1/4-inch scale and details at 3-inch scale.

    1.05 DELIVERY, HANDLING, STORAGE

    A. Products shall be delivered to job-site in accordance with Section 01610.

    B. Store and protect products in accordance with Section 01620.

    1. Stack preformed and prefinished material to prevent twisting, bending, or abrasion, and provide ventilation.

    2. Prevent contact with materials during storage which may cause discoloration, staining, or damage.

   PART 2 - PRODUCTS

    02 SHEET MATERIALS

    A. Zinc-Coated Steel: Commercial quality, 0.20 percent copper, ASTM A526 except ASTM A527 for lock-forming, G90 hot-dipped galvanized, mill phosphatized for painting.

    1. Gage: As indicated on drawings.

    B. Sheet Aluminum: ASTM B209, alloy 3003, temper H14, AA-C22A41 clear anodized finish.

    1. Gage: As indicated on drawings.

    C. Prefinished Aluminum Sheet: ASTM B209, alloy, temper, plain.

    1. Finish: Factory-applied Kynar 500 fluorocarbon coating.

    2. Gage: As indicated on drawings.

    3. Color: To be selected by Architect.

    4. All exposed sheet metal work shall be pre-finished aluminum.

    2.02 ACCESSORIES

    A. Solder: For steel or copper, 50 - 50 tin/lead solder (ASTM B32), rosin flux.

    B. Fasteners: Same metal as flashing/sheet metal. Match finish of exposed heads with material being fastened. Type and size to suit application.

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

    D. Sealant: Exterior quality conforming with Section 07920.

    E. Paper Slip Sheet: 5-lb. rosin-sized building paper.

    F. Polyethylene Underlayment: 6-mil minimum carbonated polyethylene film tested in accordance with ASTM E154.

    G. Reglets: Metal units compatible with flashing, noncorrosive.

    H. Neoprene Washers: Required for all fasteners which will remain exposed to the weather.

    I. Roofing Cement: ASTM D2822, asphaltic.

    J. Cast-Iron Drainage Boots: Grey iron castings of size indicated, ASTM A48, bituminous shop-coated.

    K. Metal Accessories: Sheet metal clips, straps, anchoring devices, as required for installation of work, matching or compatible with adjoining materials, noncorrosive, size and gauge required for performance.

    2.03 FABRICATED UNITS

    A. General: Shop-fabricate work to extent possible. Comply with details shown and with applicable requirements of SMACNA "Architectural Sheet Metal Manual".

    1. Fabricate for waterproof and weather-resistant performance, with expansion provisions for running work, sufficient to prevent leakage, damage, or deterioration of the work.

    2. Form work to fit substrates.

    3. Form exposed work without excessive oil-canning, buckling, and tool marks, true to line and levels indicated, with exposed edges folded back to form hems.

    4. Fabricate nonmoving seams in sheet metal with flat-lock seams. For metal other than aluminum, tin edges to be seamed, form seams, and solder. Form aluminum seams with epoxy seam sealer.

    B. Perforated Gravel Guards:

    1. Form sections in maximum 10 foot lengths true to shape, accurate in size, square, and free of distortion and defects.

    2. Corner Pieces: Fabricate 18" x 18" units from one piece metal; solder for watertightness and rigidity.

    3. Vertical Surfaces: Fabricate with bottom edge formed outward 1/4 inch and hemmed to form a drip edge.

    4. Exposed Edges: Hem on underside 1/2 inch.

    5. Make allowances for expansion joints. Use intermeshing hooked flanges, not less than one inch deep, filled with mastic sealant.

    6. Protect metal from noncompatible metal or corrosive substrates by coating with bituminous coating as recommended by manufacturer/fabricator.

   PART 3 - EXECUTION

    03 PREPARATION

    A. Inspection:

    1. Before starting the work of this section, verify other work affecting sheet metal work is complete and approved.

    2. Beginning of sheet metal work means acceptance of existing conditions.

    B. For Roofing Work:

    1. Exercise care when working on or about roof surfaces to avoid damaging or puncturing membranes and flashings.

    2. Place plywood panels on roof surfaces adjacent to work of this section and on access routes. Keep in place until completion of work.

    04 INSTALLATION REQUIREMENTS

    A. Perform sheet metal work in accordance with approved shop drawings and installation instructions and recommendations of SMACNA "Architectural Sheet Metal Manual."

    1. Anchor work securely in place by methods indicated, providing for thermal expansion; conceal fasteners where possible.

    2. Set units true to line and level.

    3. Install work with laps, joints, and seams watertight and weatherproof.

    B. Underlayment: For stainless steel or aluminum to be installed directly on cementitious or wood substrates, install a slip sheet of red rosin paper and a course of polyethylene underlayment.

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

    D. Install counterflashing in reglets, either by snap-in seal arrangement or by welding in place for anchorage and filling reglet with mastic or elastomeric sealant.

    E. Flashing Attachment:

    1. Secure all flashing 16 inches on centers.

    2. Install parapet cap flashing and gravel guards with continuous hold- down clips secured 16" o.c.

    3. Exposed fasteners shall be complete with neoprene washers 16" o.c.

    F. Joints for Gravel Guards and Parapet Caps:

    1. Overlap minimum 4 inches.

    2. Set in solid bed of plastic cement.

    3. Make allowances for expansion joints.

    4. When field-soldering, wipe and wash soldered joints to remove traces of flux immediately after soldering.

    3.02 CLEANING AND PROTECTION

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

    B. Protection: Protect flashings and sheet metal work during construction from damage or deterioration.

    END OF SECTION