0933-003-04
SECTION 07620
SHEET METAL FLASHING AND TRIM
PART 1 - GENERAL
1.1
RELATED DOCUMENTS
A.
Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 1 Specification Sections, apply to this Section.
1.2
SUMMARY
1.3
SUMMARY
A.
1.4
1.5
REFERENCES
A.
ASTM International (ASTM):
1.
A 653/A653M - Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron
Alloy-Coated (Galvannealed) by the Hot-Dip Process; 2005a.
2.
D 4586 - Specification for Asphalt Roof Cement, Asbestos-Free; 2000.
B.
Sheet Metal and Air Conditioning
Architectural Sheet Metal Manual.
1.7
Contractors'
National
Association
(SMACNA):
SUBMITTALS
A.
1.6
Section Includes:
1.
Fabricated sheet metal items, including flashings and counter flashings.
2.
Precast concrete splash pads.
Shop Drawings: Indicate material profile, jointing pattern, jointing details, fastening methods,
flashings, terminations, and installation details.
QUALITY ASSURANCE
A.
Perform work in accordance with SMACNA Architectural Sheet Metal Manual requirements
and standard details, except as otherwise indicated.
B.
Fabricator and Installer Qualifications: Company specializing in sheet metal work with five
years of documented experience.
DELIVERY, STORAGE, AND HANDLING
A.
Stack material to prevent twisting, bending, and abrasion, and to provide ventilation. Slope
metal sheets to ensure drainage.
B.
Prevent contact with materials which may cause discoloration or staining.
PART 2 - PRODUCTS
2.1
2.2
MATERIALS
A.
Galvanized Steel: ASTM A653/A653M, with G90/Z275 zinc coating; minimum 0.02-inch
thick base metal.
B.
Accessories:
1.
Fasteners: Galvanized steel, with soft neoprene washers.
2.
Primer: Zinc chromate type.
3.
Protective Backing Paint: Zinc molybdate alkyd.
4.
Sealant: Type as specified in Division 9 Section 07920 “Joint Sealants.”
5.
Plastic Cement: ASTM D 4586, Type I.
FABRICATION
A.
Form sections true to shape, accurate in size, square, and free from distortion or defects.
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B.
Form pieces in longest possible lengths.
C.
Hem exposed edges on underside 1/2-inch; miter and seam corners.
D.
Form material with flat lock seams, except where otherwise indicated. At moving joints, use
sealed lapped, bayonet-type or interlocking hooked seams.
E.
Fabricate corners from one piece with minimum 18-inch long legs; seam for rigidity, seal with
sealant.
F.
Fabricate vertical faces with bottom edge formed outward 1/4-inch and hemmed to form drip.
G.
Fabricate flashings to allow toe to extend 2 inches over roofing gravel. Return and brake
edges.
PART 3 - EXECUTION
3.1
3.2
3.3
EXAMINATION
A.
Verify roof openings, curbs, pipes, sleeves, ducts, and vents through roof are solidly set,
reglets in place, and nailing strips located.
B.
Verify roofing termination and base flashings are in place, sealed, and secure.
PREPARATION
A.
Install starter and edge strips, and cleats before starting installation.
B.
Back paint concealed metal surfaces with protective backing paint to a 15-mil minimum dry
film thickness.
INSTALLATION
A.
Secure flashings in place using concealed fasteners. Use exposed fasteners only where
permitted.
B.
Apply plastic cement compound between metal flashings and felt flashings.
C.
Fit flashings tight in place. Make corners square, surfaces true and straight in planes, and
lines accurate to profiles.
END OF SECTION
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