07620-Sheet Metal Flashing and Trim.DOC

Ellington Field ANGB

Houston, Texas

MASTERSPEC text, Copyright 1994, AIA, The American Institute of Architects

Paragraph number formatting method, Copyright 1988, ARCOM, Architectural Computer Services, Inc.

SECTION 07620

SHEET METAL FLASHING AND TRIM

THIS SECTION USES THE TERM ARCHITECT. CHANGE THIS TERM AS NECESSARY TO MATCH THE ACTUAL TERM USED TO IDENTIFY THE DESIGN PROFESSIONAL AS DEFINED IN THE GENERAL AND SUPPLEMENTARY CONDITIONS.

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

A.

This Section includes sheet metal flashing and trim in the following categories:

ADJUST LIST BELOW TO SUIT PROJECT. COORDINATE NOMENCLATURE WITH DRAWINGS.

1.

Roof-drainage systems.

2.

Exposed trim, gravel stops, and fasciae.

3.

Copings.

4.

Metal flashing.

5.

Reglets.

B.

Related Sections: The following Sections contain requirements that relate to this Section:

LIST BELOW ONLY PRODUCTS, CONSTRUCTION, AND EQUIPMENT FOR THIS PROJECT THAT THE READER MIGHT EXPECT TO FIND IN THIS SECTION BUT ARE SPECIFIED ELSEWHERE. VERIFY THAT THE SECTION TITLES LISTED BELOW FOR THIS PROJECT'S SPECIFICATIONS ARE CORRECT.

1.

Division 4 Section for integral masonry flashings specified as part of masonry work.

2.

Division 7 Section "Joint Sealants" for elastomeric sealants.

3.

Division 7 Section “Manufactured Roof Panels.”

1.3

PERFORMANCE REQUIREMENTS

A.

General: Install sheet metal flashing and trim to withstand wind loads, structural movement, thermally induced movement, and exposure to weather without failing.

DELETE PARA AND SUBPARAS BELOW IF FM-LISTED ROOFING ASSEMBLIES ARE NEITHER REQUIRED NOR SPECIFIED.

B.

Fabricate and install flashings at roof edges to comply with recommendations of FM Loss Prevention Data Sheet 1-49 for the following wind zone:

RETAIN WIND ZONE BELOW IF APPLICABLE TO PROJECT CONDITIONS. WIND ZONE 1 IS SUBDIVIDED INTO 2 RANGES. WIND ZONE 3 REQUIRES ASSEMBLIES OF SPECIAL DESIGN.

1.

Wind Zone 3: Wind pressures of 46 to 104 psf (2.20 to 4.98 kPa).

1.4

SUBMITTALS

A.

General: Submit each item in this Article according to the Conditions of the Contract and Division 1 Specification Sections.

DELETE BELOW IF NO MANUFACTURED ITEMS OR RETAIN AND INSERT REQUIRED SUBMITTALS.

B.

Product Data including manufacturer's material and finish data, installation instructions, and general recommendations for each specified flashing material and fabricated product.

DELETE BELOW IF WORK IS NOT COMPLEX ENOUGH TO JUSTIFY SHOP DRAWINGS; EDIT TO DELETE NONAPPLICABLE UNITS. POSSIBLY INSERT PRODUCT HANDLING ARTICLE WHERE SUBSTANTIAL VOLUME OF HIGHLY FINISHED WORK IS REQUIRED.

C.

Shop Drawings of each item specified showing layout, profiles, methods of joining, and anchorage details.

D.

Samples of sheet metal flashing, trim, and accessory items, in the specified finish. Where finish involves normal color and texture variations, include Sample sets composed of 2 or more units showing the full range of variations expected.

1.

8-inch-square Samples of specified sheet materials to be exposed as finished surfaces.

DELETE ABOVE AND BELOW IF NO CONTROL IS REQUIRED ON SHEET MATERIALS. DELETE BELOW IF VISUAL CONTROL OF TRIM UNITS, GUTTERS, DOWNSPOUTS, EXPANSION-JOINT UNITS, ETC., IS NOT DESIRED.

2.

12-inch-long Samples of factory-fabricated products exposed as finished Work. Provide complete with specified factory finish.

E.

Qualification data for firms and persons specified in the "Quality Assurance" Article to demonstrate their capabilities and experience. Include lists of completed projects with project names and addresses, names and addresses of architects and owners, and other information specified.

1.5

QUALITY ASSURANCE

A.

Installer Qualifications: Engage an experience Installer who has completed sheet metal flashing and trim work similar in material, design, and extent to that indicated for this Project and with a record of successful in-service performance.

DELETE BELOW IF NOT REQUIRED. IF RETAINING, INDICATE LOCATION, SIZE, AND OTHER DETAILS OF MOCKUPS ON DRAWINGS OR BY INSERT.

1.6

PROJECT CONDITIONS

A.

Coordinate Work of this Section with interfacing and adjoining Work for proper sequencing of each installation. Ensure best possible weather resistance, durability of Work, and protection of materials and finishes.

INSERT SPECIAL PROJECT WARRANTY REQUIREMENTS HERE FOR EXTENSIVE/ELABORATE (ESPECIALLY FACTORY-FABRICATED) SYSTEMS.

PART 2 - PRODUCTS

REVISE BELOW TO INCLUDE OTHER METALS, SUCH AS ZINC ALLOY, TERNEPLATE, AND WEATHERING STEEL.

2.1

METALS

REVISE BELOW IF ALUMINUM-ZINC ALLOY COATING IS DESIRED IN LIEU OF ZINC COATING.

A.

Coil-Coated Galvanized Steel Sheet: Zinc-coated, commercial-quality steel sheet conforming to ASTM A 755, G 90 coating designation, coil coated with high-performance fluoropolymer coating as specified in "Coil-Coated Galvanized Steel Sheet Finish" Article; not less than 0.0336 inch (0.85 mm) thick, unless otherwise indicated.

2.2

REGLETS

A.

General: Units of type, material, and profile indicated, formed to provide secure interlocking of separate reglet and counterflashing pieces and compatible with flashing indicated.

SELECT TYPE(S) REQUIRED.

B.

Surface-Mounted Type: If shown, provide with slotted holes for fastening to substrate, with neoprene or other suitable weatherproofing washers, and with channel for sealant at top edge.

C.

Masonry Type: Provide with offset top flange for embedment in masonry mortar joint.

D.

Flexible Flashing Retainer: Provide resilient plastic or rubber accessory to secure flexible flashing in reglet where clearance does not permit use of standard metal counterflashing or where Drawings show reglet without metal counterflashing.

E.

Counterflashing Wind-Restraint Clips: Provide galvanized steel clips, 0.0217 inch (0.55 mm) thick, to be installed before counterflashing to prevent wind uplift of the counterflashing lower edge.

F.

Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated in the Work include, but are not limited to, the following:

RETAIN ABOVE FOR NONPROPRIETARY OR BELOW FOR SEMIPROPRIETARY SPECIFICATION. REFER TO DIVISION 1 SECTION "MATERIALS AND EQUIPMENT."

SEE EDITING INSTRUCTION NO. 1 IN THE EVALUATIONS FOR CAUTIONS ABOUT NAMING PRODUCTS AND MFRS.

1.

Fry Reglet Corporation.

2.

Hickman: W.P. Hickman Co.

3.

Keystone Flashing Company.

2.3

MISCELLANEOUS MATERIALS AND ACCESSORIES

BEFORE RETAINING BELOW AND DESIGNING A BURNED-JOINT (WELDED) LEAD SHEET SYSTEM, CONFIRM AVAILABILITY OF LEAD BURNERS TO PERFORM WORK AT THE SITE.

A.

Burning Rod for Lead: Same composition as lead sheet.

B.

Solder: ASTM B 32, Grade Sn50, used with rosin flux.

RETAIN ABOVE FOR GALVANIZED STEEL, LEAD (IF SOLDERED), COPPER, OR LEAD-COATED COPPER SHEETS. RETAIN BELOW FOR STAINLESS STEEL.

C.

Fasteners: Same metal as sheet metal flashing or other noncorrosive metal as recommended by sheet metal manufacturer. Match finish of exposed heads with material being fastened.

D.

Asphalt Mastic: SSPC-Paint 12, solvent-type asphalt mastic, nominally free of sulfur and containing no asbestos fibers, compounded for 15-mil dry film thickness per coat.

INSERT OTHER SPECIFIC REQUIREMENTS FOR PRODUCTS BELOW OR ADD A LIST OF ACCEPTABLE PRODUCTS FOR MORE CONTROL. COORDINATE WITH DIVISION 7 SECTION "JOINT SEALANTS."

E. Elastomeric Sealant: Generic type recommended by sheet metal manufacturer and fabricator of components being sealed and complying with requirements for joint sealants as specified in Division 7 Section "Joint Sealants."

F.

Adhesives: Type recommended by flashing sheet metal manufacturer for waterproof and weather-resistant seaming and adhesive application of flashing sheet metal.

G. Paper Slip Sheet: 5-lb/square red rosin, sized building paper conforming to FS UU-B-790, Type I, Style 1b.

H. Metal Accessories: Provide sheet metal clips, straps, anchoring devices, and similar accessory units as required for installation of Work, matching or compatible with material being installed; noncorrosive; size and thickness required for performance.

I. Roofing Cement: ASTM D 4586, Type I, asbestos free, asphalt based.

J. Gutter Screen: ¼-inch (6 mm) hardware cloth installed in sheet metal frames. Fabricate screen and frame of same basic material as gutters and downspouts.

INSERT OTHER MATERIALS AS REQUIRED FOR PROJECT.

2.4

FABRICATION, GENERAL

A.

Sheet Metal Fabrication Standard: Fabricate sheet metal flashing and trim to comply with recommendations of SMACNA's "Architectural Sheet Metal Manual" that apply to the design, dimensions, metal, and other characteristics of the item indicated.

B.

Comply with details shown to fabricate sheet metal flashing and trim that fit substrates and result in waterproof and weather-resistant performance once installed. Verify shapes and dimensions of surfaces to be covered before fabricating sheet metal.

C.

Form exposed sheet metal Work that is without excessive oil canning, buckling, and tool marks and that is true to line and levels indicated, with exposed edges folded back to form hems.

D.

Seams: Fabricate nonmoving seams in sheet metal with flat-lock seams. Tin edges to be seamed, form seams, and solder.

RETAIN ABOVE FOR METAL OTHER THAN ALUMINUM. RETAIN BELOW FOR ALUMINUM.

E.

Expansion Provisions: Space movement joints at maximum of 10 feet with no joints allowed within 24 inches of corner or intersection. Where lapped or bayonet-type expansion provisions in Work cannot be used or would not be sufficiently weatherproof and waterproof, form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with mastic sealant (concealed within joints).

F.

Sealed Joints: Form nonexpansion, but movable, sealed joints in metal to accommodate elastomeric sealant to comply with SMACNA standards.

G.

Dissimilar Materials: Separate metal from noncompatible metal or corrosive substrates by coating concealed surfaces at locations of contact with asphalt mastic or other permanent separation as recommended by manufacturer.

H.

Conceal fasteners and expansion provisions where possible. Exposed fasteners are not allowed on faces of sheet metal exposed to public view.

I.

Fabricate cleats and attachment devices from same material as sheet metal component being anchored or from compatible, noncorrosive metal recommended by sheet metal manufacturer, in a size as recommended by SMACNA manual or sheet metal manufacturer for application but never less than thickness of metal being secured.

2.5

SHEET METAL FABRICATIONS

A.

General: Fabricate sheet metal items in thickness or weight needed to comply with performance requirements but not less than that listed below for each application and metal.

RETAIN ITEMS REQUIRED AND SELECT MATERIAL WITH THICKNESS FROM CHOICES BELOW. DELETE REMAINDER. REVISE THICKNESSES OF METALS TO SUIT PROJECT. ADD OTHER ITEMS IN PROJECT WITH MATERIAL AND THICKNESS.

B.

Gutters with Girth up to 15 Inches: Fabricate from coil-coated galvanized steel, 0.0217 inch thick (fluorpolymer coating).

FOR GUTTERS WITH LARGER GIRTH, SEE SMACNA'S "ARCHITECTURAL SHEET METAL MANUAL."

C.

Downspouts: Fabricate from coil-Coated galvanized steel, 0.0217 inch thick (fluorpolymer coating).

D.

Scuppers: Fabricate from Coil-coated galvanized steel, 0.0276 inch thick (fluorpolymer coating).

E.

Exposed Trim, Gravel Stops, and Fasciae: Fabricate from coil-coated galvanized steel, 0.0276 inch thick (fluorpolymer coating).

F.

Copings: Fabricate from coil-coated galvanized steel, 0.0396 inch thick (fluorpolymer coating).

G.

Base Flashing: Fabricate from coil-coated galvanized steel, 0.0276 inch thick (fluorpolymer coating).

H.

Counterflashing: Fabricate from coil-coated galvanized steel, 0.0217 inch thick (fluorpolymer coating).

I.

Flashing Receivers: Fabricate from coil-coated galvanized steel, 0.0217 inch thick (fluorpolymer coating).

J.

Equipment Support Flashing: Fabricate from coil-coated galvanized steel, 0.0276 inch thick (flourpolymer coating).

2.6

COIL-COATED GALVANIZED STEEL SHEET FINISH

RETAIN FINISH BELOW IF APPLICABLE. OTHER FINISHES ARE AVAILABLE; REFER TO NAAMM METAL FINISHES MANUAL, SECTIONS AMP 504 AND 505.

A.

High-Performance Organic Coating Finish: Apply the following system by coil-coating process on galvanized steel sheet as recommended by coating manufacturers and applicator.

1.

Fluoropolymer 2-Coat Coating System: Manufacturer's standard 2-coat, thermocured system composed of specially formulated inhibitive primer and fluoropolymer color topcoat containing not less than 70 percent polyvinylidene fluoride resin by weight; complying with AAMA 605.2.

RETAIN ONE COLOR REQUIREMENT FROM BELOW. TO ENSURE OBTAINING EXACT FINISH DESIRED, INSERT PRODUCT AND MFRS' NAMES OF COATING SYSTEM OR SYSTEMS.

a.

Color and Gloss: As selected by Contracting Officer’s Representative to match Section 07610 “Sheet Metal Roofing” for color and gloss.

RETAIN BELOW TO ENSURE USING PRODUCTS THAT COMPLY WITH REQUIREMENTS IN SUBPARAS ABOVE.

PART 3 - EXECUTION

3.1

EXAMINATION

A. Examine substrates and conditions under which sheet metal flashing and trim are to be installed and verify that Work may properly commence. Do not proceed with installation until unsatisfactory conditions have been corrected.

3.2 INSTALLATION

A. General: Unless otherwise indicated, install sheet metal flashing and trim to comply with performance requirements, manufacturer's installation instructions, and SMACNA's "Architectural Sheet Metal Manual." Anchor units of Work securely in place by methods indicated, providing for thermal expansion of metal units; conceal fasteners where possible, and set units true to line and level as indicated. Install Work with laps, joints, and seams that will be permanently watertight and weatherproof.

B.

Install exposed sheet metal Work that is without excessive oil canning, buckling, and tool marks and that is true to line and levels indicated, with exposed edges folded back to form hems. Install sheet metal flashing and trim to fit substrates and to result in waterproof and weather-resistant performance. Verify shapes and dimensions of surfaces to be covered before fabricating sheet metal.

DELETE BELOW IF FM-LISTED ROOFING SYSTEMS ARE NOT SPECIFIED FOR PROJECT.

C.

Roof-Edge Flashings: Secure metal flashings at roof edges according to FM Loss Prevention Data Sheet 1-49 for specified wind zone. Coordinate with Section 07610, “Sheet Metal Roofing”.

D.

Expansion Provisions: Provide for thermal expansion of exposed sheet metal Work. Space movement joints at maximum of 10 feet with no joints allowed within 24 inches of corner or intersection. Where lapped or bayonet-type expansion provisions in Work cannot be used or would not be sufficiently weatherproof and waterproof, form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with mastic sealant (concealed within joints).

E. Sealed Joints: Form nonexpansion, but movable, sealed joints in metal to accommodate elastomeric sealant to comply with SMACNA standards.

a. Fill joint with sealant and form metal to completely conceal sealant.

b. Use joint adhesive for nonmoving joints specified not to be soldered.

INSERT LIST OF REQUIRED SEPARATIONS BELOW OR INDICATE LOCATIONS AND DETAILS ON DRAWINGS.

F.

Separations: Separate metal from noncompatible metal or corrosive substrates by coating concealed surfaces, at locations of contact, with asphalt mastic or other permanent separation as recommended by manufacturer.

1.

Bed flanges of Work in a thick coat of roofing cement where required for waterproof performance.

DELETE BELOW IF REGLETS ARE NOT REQUIRED. EDIT TEXT TO CONFORM WITH LOCAL PRACTICE AND TRADE JURISDICTIONS FOR REGLETS AND THROUGH-WALL FLASHING. REVISE IF REGLETS REQUIRE INSTALLATION IN EXISTING CONSTRUCTION.

G.

Install reglets to receive counterflashing according to the following requirements:

1.

Where reglets are shown in concrete, furnish reglets for installation under Division 3 Section "Cast-in-Place Concrete."

2.

Where reglets are shown in masonry, furnish reglets for installation under Division 4 Section "Unit Masonry."

H.

Counterflashings: Coordinate installation of counterflashings with installation of assemblies to be protected by counterflashing. Install counterflashings in reglets or receivers. Secure in a waterproof manner by means of snap-in installation and sealant, lead wedges and sealant, interlocking folded seam, or blind rivets and sealant. Lap counterflashing joints a minimum of 2 inches and bed with sealant.

I.

Roof-Drainage System: Install drainage items fabricated from sheet metal, with straps, adhesives, and anchors recommended by SMACNA's Manual or the item manufacturer, to drain roof in the most efficient manner. Coordinate roof-drain flashing installation with roof-drainage system installation. Coordinate flashing and sheet metal items for steep-sloped roofs with roofing installation.

J.

Equipment Support Flashing: Coordinate equipment support flashing installation with roofing and equipment installation. Weld or seal flashing to equipment support member.

INSERT SPECIFIC INSTALLATION REQUIREMENTS FOR OTHER SYSTEMS AND SHEET METAL ACCESSORY ITEMS SPECIFIED IN THIS SECTION.

3.2

CLEANING AND PROTECTION

A.

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

B.

Provide final protection and maintain conditions that ensure sheet metal flashing and trim Work during construction is without damage or deterioration other than natural weathering at the time of Substantial Completion.

END OF SECTION 07620

Sheet Metal Flashing and Trim

07620-5