07600.DOC

SECTION 07600

PART 1

GENERAL

1.1

APPLICABLE PUBLICATIONS

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

American Society for Testing and Materials (ASTM) Publications

ASTM D 2822

(1991) Asphalt Roof Cement

ASTM E 96

(1980) Water Vapor Transmission of

Materials

American Architectural Manufacturers Association (AAMA)

AAMA Specification 1402.86

Standard Specification for Aluminum

Siding, Soffit, and Fascia

Federal Specifications (FS)

FSUU-B-790

(Rev. A; Int. Am. 1) Building Paper, Vegetable Fiber: (Kraft, Waterproofed, Water Repellent and Fire Resistant)

Sheet Metal and Air Conditioning Contractors National Association, Inc. (SMACNA)

SMACNA-02

(1987) Architectural Sheet Metal

Manual

1.2 GENERAL REQUIREMENTS

Sheet metalwork shall be accomplished to form weather tight construction. Work shall be installed 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. Exposed edges shall be hemmed. Bottom edges of exposed vertical surfaces shall be angled to form drips. Flashing at the end of a run shall be formed into a three dimensional configuration to direct water to the outside of the system. Joints shall be installed as specified in Table 3. Accessories and other items essential to complete the metal installation, though not specifically indicated or specified, shall be provided. Roof flanges of sheet metal shall be set in bituminous cement over built-up roofing or shall be woven into shingle roofing before nailing. Installation of sheet metal items used in conjunction with roofing shall be coordinated with roofing work to permit continuous roofing operations. Factory-fabricated components shall be packed in cartons marked with the manufacturer's name or trademark. Bulk materials from which items are field fabricated shall have manufacturer's name or trademark printed or embossed at frequent intervals to permit easy identification.

1.3 SUBMITTALS

The following shall be submitted in accordance with Section 01300:

A. Shop Drawings. Detail drawings shall be submitted for approval. Materials shall not be delivered to the site until after the approved detail drawings have been returned to the Contractor. Drawings shall show weights, gauges, or thickness of sheet metal; type of material; joining, expansion-joint spacing, and fabrication details; and installation procedures.

B. Product Data. Submit complete product data of each product specified, including details of construction, dimensions and thickness of individual components, profiles, textures and colors.

C. Samples. Provide samples for ridge vents, soffits, sheet fetal fascia covers, drip edges, and starter strips showing configuration textures and colors.

PART 2

PRODUCTS

2.1 MATERIALS

Materials shall conform to the requirements specified below, and those given in Table I. Where Table I lists more than one metal for a particular item, any listed metal may be used unless otherwise specified. Different items need not be of the same metal.

A. Bituminous Cement. ASTM D 2822, Type I.

B. Fasteners. Materials shall conform to Table 2. Fasteners shall be the best type for the application.

C. Sheet Metal.

1. 26 ga. Prefinished sheet metal..

2. Slip Sheet. FS UU-B-790, Type I, Style 1b, Grade A.

2.2 FASCIA COVERS, DRIP EDGES, AND FLASHING

Materials will be 26 ga. sheet metal protected with a factory Kynar coating. Color shall be as selected by the Contracting Officer from the manufacturer's standard colors. Products shall carry a 20-year warranty against warping, peeling, cracking, or fading.

2.3 SEALANTS AND SEALING COMPOUNDS

Sealants and sealing compounds referred to hereinafter are specified in Section 07900 CAULKING AND SEALANTS.

PART 3

EXECUTION

3.1

PAINT

A. Non-factory painted/coated aluminum surfaces to be protected shall be solvent cleaned and given a coat of zinc-chromate primer and one coat of paint. Paint shall conform to Section 09900 PAINTING, GENERAL.

3.2

RIVETING, SEAMING, AND SEALING.

A. Riveting and Sealing. Joints in sheets 0.040 inch or less in thickness shall be made mechanically and sealed with the sealant specified.

B. Seams. Flat-look and soldered-lap seams shall finish not less than ½-inch wide. Unsoldered plain-lap seams shall alp not less than 3 inches unless otherwise specified. Flat seams shall be made in the direction of the flow.

3.3 CLEATS

A continuous cleat shall be provided where indicated or specified to secure loose edges of the sheet metal work. Butt joints shall be spaced approximately 1/8-inch apart. The cleat shall be fastened to the supporting construction with nails evenly spaced not over 4 inches on centers. The cleat shall be of sufficient width to provide adequate bearing area to insure a rigid installation.

3.4 FLASHINGS

Flashings shall be installed at intersections of roofs with vertical surfaces and at projections through roof, base flashing for exterior and interior corners shall be factory-fabricated units. Corner units shall have mitered joints, shall be installed with 3-inch lap joint over flashings on each side.

A. Base flashing shall extend out on the roof or horizontal surface not less than 4 inches. Base flashing at duct-thru-roof shall extend vertically to create a 3 inch lap with the duct hood. Metal base flashing shall be installed at roof penetrations and shall be coordinated with roofing work. Metal base flashing shall be set in plastic bituminous cement over the roofing membrane, and nailed to nailing strip and shall be secured in place on the roof side with nails spaced not more than 3 inches on centers.

B. Step Flashing. Step flashing shall be installed where sloping roofs surfaced with shingles abut vertical surfaces. Separate pieces of base flashing shall be placed in alternate shingle courses. Each piece of base flashing shall extend out onto the roof at least 4 inches and shall be nailed to the deck. The step base flashing shall extend up along the wall not less than 4 inches and stop beneath the cap flashing or shall be anchored beneath wood siding in frame construction. Cap flashing shall be set in a reglet into masonry and concrete construction, and cap flashing shall lap over the flashing below not less than 3 inches. The step base flashing at vertical joints between the sections shall be lapped not less than 3 inches.

TABLE 1. SHEET METAL WEIGHTS AND THICKNESS

Flashings:

Base

Stepped

TABLE 2. SHEET METAL JOINTS

Stepped 3" lap

END OF SECTION

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