076200_-_SHEET_METAL_FLASHING_AND_TRIM.pdf

Copyright 2013 AIA MasterSpec Small Project 10/13

SHEET METAL FLASHING AND TRIM 076200 - 1

SECTION 076200 - SHEET METAL FLASHING AND TRIM

1.1 SECTION REQUIREMENTS

A. Submittals: Product Data, and Shop Drawings.

B. Coordinate installation of sheet metal flashing and trim with adjoining roofing and wall materials, joints, and seams to provide a leak-proof, secure, and noncorrosive installation.

C. Fabricator Qualifications: For copings and low-slope roof edge flashings that are SPRI ES-1 tested and FM Approvals approved, shop shall be listed as able to fabricate required details as tested and approved.

D. Warranty on Finishes: Manufacturer agrees to repair or replace sheet metal flashing and trim that shows evidence of deterioration of factory-applied finishes within 20 years.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Standard: Comply with NRCA's "The NRCA Roofing Manual" unless otherwise indicated.

Conform to dimensions and profiles shown unless more stringent requirements are indicated.

B. FM Approvals' Listing: Manufacture and install roof edge flashings that are listed in FM

Approvals' "RoofNav" and approved for windstorm classification, Class 1-60. Identify materials with name of fabricator and design approved by FM Approvals.

C. SPRI Wind Design Standard: Manufacture and install roof edge flashings tested according to

SPRI ES-1 and capable of resisting the following design pressure:

1. Design Pressure: 30 psf.

2.2 SHEET METAL

A. Metallic-Coated Steel Sheet: Galvanized steel sheet, ASTM A 653/A 653M, G90 (Z275);

0.022-inch (0.56-mm) nominal thickness.

1. Finish: Manufacturer's standard two-coat fluoropolymer system with color coat containing not less than 70 percent PVDF resin by weight.

2.3 ACCESSORIES

A. Felt Underlayment: ASTM D 226, Type II (No. 30), asphalt-saturated organic felts.

B. Slip Sheet: Rosin-sized building paper, 3-lb/100 sq. ft. (0.16-kg/sq. m) minimum.

Copyright 2013 AIA MasterSpec Small Project 10/13

SHEET METAL FLASHING AND TRIM 076200 - 2

C. Fasteners: annular-threaded nails, self-tapping screws, self-locking rivets and bolts, and other suitable fasteners according to manufacturer’s recommendation.

1. Exposed Fasteners: Heads matching color of sheet metal roofing using plastic caps or factory-applied coating.

D. Butyl Sealant: ASTM C 1311, solvent-release butyl rubber sealant.

2.4 FABRICATION

A. Fabricate sheet metal flashing and trim to comply with roof manufacturer’s recommendations for design, dimensions, geometry, thickness and other characteristics.

B. Expansion Provisions: Where lapped expansion provisions cannot be used, form expansion joints of intermeshing hooked flanges, not less than 1 inch (25 mm) deep, filled with butyl sealant concealed within joints.

C. Fabrication Tolerances: Fabricate sheet metal flashing and trim that are capable of installation to tolerances specified in MCA's "Guide Specification for Residential Metal Roofing."

PART 3 - EXECUTION

3.1 INSTALLATION

A. Comply with cited sheet metal standards. Allow for thermal expansion; set true to line and level. Install Work with laps, joints, and seams permanently watertight and weatherproof;

conceal fasteners where possible.

B. Sealant Joints: Where movable, nonexpansion-type joints are required, form metal to provide for proper installation of elastomeric sealant according to cited sheet metal standard.

C. Seams: Fabricate nonmoving seams with flat-lock seams.

D. Metal Protection: Where dissimilar metals contact each other, protect against galvanic action or corrosion by painting contact surfaces with bituminous coating.

END OF SECTION 076200