07600 sheet metal flashing Attch 4.pdf

FA4417-10-R-0012 Amendment 2, Attachment 4 MS0610

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SECTION 07600 SHEET METAL FLASHING AND TRIM

PART 1 GENERAL

1.01 RELATED SPECIFICATION SECTIONS:

A. Section 01000 – GENERAL REQUIREMENTS

1.02 SECTION INCLUDES

A. Coping, parapet, cap, sill, lintel, shingle edge, and other flashing.

B. Counterflashings over bituminous, base flashing.

C. Counterflashings for roof hatches, skylights.

D. Counterflashings at roof mounted equipment and vent stacks.

1.03 PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

A. See applicable sections of the Specifications and the Drawings.

1.04 REFERENCES

A. ASTM A153 - Zinc Coating (Hot Dip) on Iron and Steel Hardware

B. ASTM A792 - Steel Sheet, Aluminum-Zinc Coated, "Galvalume"

C. ASTM B32 - Solder Metal.

D. ASTM B486 - Paste Solder.

E. ASTM D226 - Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing.

F. ASTM D4586 - Asphalt Roof Cement, Asbestos-Free.

G. FS O-F-506 - Flux, Soldering, Paste and Liquid.

H. SMACNA - Architectural Sheet Metal Manual.

1.05 SUBMITTALS

A. Submit under provisions of Section 01300.

B. Shop Drawings: Indicate material profile, jointing pattern, jointing details, fastening methods, flashing, terminations, and installation details.

C. Submit one sample 12" x 12" size illustrating metal finish color.

1.06 QUALITY ASSURANCE

A. Perform work in accordance with SMACNA standard details and requirements.

B. Maintain one copy of the document at the site.

1.07 QUALIFICATIONS

A. Fabricator and Installer: Company specializing in sheet metal flashing work with three years experience.

1.08 DELIVERY, STORAGE, AND HANDLING

A. Deliver, store, protect and handle products to site under provisions of Section 01600.

B. Stack preformed [and prefinished] material to prevent twisting, bending, or abrasion, and to provide ventilation. Slope metal sheets to ensure drainage.

C. Prevent contact with materials, which may cause discoloration or staining.

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1.09 COORDINATION

A. Coordinate work under provisions of Section 01000.

1.10 GENERAL WARRANTY:

A. Submit two copies of the manufacturer's written warranty providing twenty (20) year guarantee that finish will not chip, crack, craze, blister, or peel and without chalking in excess of 8 (ASTMD659) and without fading (color change) in excess of 5 NBS units for the same time period. Include coverage for weather-tightness of building enclosure after installation. Warranty shall commence on the date of acceptance by the Contracting Officer.

PART 2 PRODUCTS

2.01 MATERIALS

A. Sheet Steel Stock: ASTM A792 Galvalume AZ55 coating, factory pre-finished.

B. Pre-finished flashings, trim, etc., within one-half mile of Santa Rosa Sound shall be 0.032 aluminum, factory pre-finished. Verify location of building with Base Civil Engineer.

C. Fasteners and Clips: Manufacturer's standard type, galvanized to ASTM A386 2.0 oz/sq finish. Finish to match adjacent surfaces.

D. Underlayment: ASTM D226, asphalt saturated felt as indicated on the drawings, or if not indicated on the drawings, a minimum of # 15.

E. Bituminous Paint: Asphaltic Type.

F. Sealant: Manufacturer's standard gun grade, one or two-part high performance urethane type, non-staining, elastomeric, skinning.

G. Slip Sheet: Rosin sized building paper.

H. Primer: Zinc Chromate type.

I. Protective Backing Paint: Asphaltic Type.

J. Plastic Cement: ASTM D4585, Type I.

K. Reglets: Surface Mounted or recessed type, as indicated on the drawings, galvanized steel.

L. Gutter and Downspout Anchorage Devices: Fabricate downspout support straps of same material and finish as roofing material. Follow SMACNA requirements.

M. Gutter Supports: Brackets or Straps as indicated on the drawings. Follow SMACNA requirements.

N. Solder: ASTM B32.

O. Paste Solder: ASTM B486.

P. Flux: FS O-F-506.

Q. Equipment Curbs. Factory pre-formed, and pre-finished, one piece curbs, welded construction, with integral water deflecting cricket, minimum 3” attachment flanges, minimum 8” high curbs and built-in rib configurations designed to fit the specific panel to which they will mount. Curbs must be fabricated from galvalume coated steel sheet compatible with the roof panels. They must provide a watertight seal.

Field fabricated curbs will not be accepted.

2.02 COMPONENTS

A. Gutters: Rectangular profile as indicated on the drawings.

1. Downspouts: Rectangular profile as indicated on the drawings.

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2. Accessories: Profiled to suit gutters and Downspouts.

3. Splash Pads: Precast concrete type, 12' x 24" size, placed at end of each downspout.

2.03 FABRICATION

A. Form sections true to shape, accurate in size, square, and free from distortion or defects.

B. Fabricate cleats of same material as sheet, minimum 2" wide x 22 gauge (minimum), interlockable with sheet.

C. Form pieces in longest possible lengths.

D. Hem exposed edges on underside 1/2".

E. Fabricate corners from one piece with minimum 18-inch long legs, seam or solder for rigidity, seal with sealant.

F. Fabricate vertical faces with bottom edge formed outward 1/2 inch and hemmed to form drip.

G. Fabricate flashing to allow toe to extend 2 inches over, roofing surface. Return and brake edges.

H. Back paint concealed metal surfaces and dissimilar metals with protective backing paint to a minimum dry film thickness of 15 mil.

2.04 FINISHES

A. Factory finished full-strength 70% "Kynar 500" coating baked on for 15 minutes at 450 degree F (232 degree C), 30% reflective gloss (ASTM D523), over minimum 0.3 mil baked on epoxy primer. Total dry film thickness of 1.0 minimum.

B. Provide coating which has been field tested under normal range of weathering conditions for minimum of

20 years without significant peel, blister, flake, chip, crack or check in finish, and without chalking in excess of 8 (ASTM D659), and without fading in excess of 5 NBS units.

C. Back paint concealed metal surfaces and dissimilar metals with protective backing paint to a minimum dry film thickness of 15 mil.

2.05 COLORS:

A. The following colors shall be applied to the various components to be incorporated into the project

1. Roof panels, fascia, gutters, soffits, low profile ridge vents, or low profile ridge cap, flashings, vents, trim and miscellaneous shapes in the plane of the roof; color "Medium Bronze".

2. Plumbing stacks, vents, or other similar products that are not available in a factory finish as specified in 2.05.A.1 above, shall be field painted. Conform to colors indicated or to the actual color of the prefinished item(s) supplied by the manufacturer. Field finished items shall receive a prime coat plus two finish coats of exterior oil paint conforming to Military Specification, MIL-P-52324, Class 2. Paint shall be as recommend by the manufacturer for the specific material to receive the finish.

PART 3 EXECUTION

3.01 EXAMINATION

A. Verify roof openings, curbs, pipes, sleeves, ducts, or vents through roof are solidly set, reglets in place, and nailing strips located. Verify roofing termination and base flashing are in place, sealed, and secure.

3.02 PREPARATION

A. Install starter and edge strips, and cleats before starting installation.

B. Install surface mounted reglets true to lines and levels. Seal top of reglets with sealant.

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3.03 INSTALLATION

A. Conform to drawing details and/or details included in the SMACNA manual.

B. Insert flashing into reglets to form tight fit. Secure in place with lead wedges. Pack remaining spaces with lead wool. Seal flashing into reglets with sealant.

C. Secure flashing in place using concealed fasteners. Use exposed fasteners only where permitted.

D. Apply plastic cement compound between metal flashing and felt flashing.

E. Fit flashing tight in place. Make corners square surfaces true and straight in planes, and lines accurate to profiles.

F. Seal metal joints watertight.

G. Secure gutters and downspouts in place using fasteners.

H. Slope gutters 1/16” inch per foot minimum.

I. Set splashes pads under downspouts.

J. Perform flood testing and note any area that is not watertight. Repair and retest until no leaks are visible.

K. Existing plumbing vents, exhaust fans and ductwork, flues, stacks, roof mounted exhaust fans/curbs and other items that penetrate or on top of the existing roof must be extended up to and through the new roof.

Provide new curbs, support framing, flashings, electrical, etc. as needed to complete the installation.

Notify Contracting Officer immediately of inoperative equipment.

3.04 FIELD QUALITY CONTROL

A. Inspection will involve surveillance of work during installation to verify compliance with specified requirements.

3.05 CLEANUP

A. Upon completion of work, remove all trash, shipping cartons. Construction debris, etc. and dispose of off-site.

B. Clean all flashing and make minor repairs to damaged surfaces.

END OF SECTION