B08_Attach_100_REV_1st_Bank_076200_Flashing_and_Sheet_Metal_0007.pdf

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PMIS 245589 FLASHING AND SHEET METAL

SECTION 07 62 00 -- FLASHING AND SHEET METAL

1.1 SUMMARY: The work of this Section includes, but is not necessarily limited to, the following:

A. Flashings, counterflashings, cap flashings, roof edges, etc.

B. Roof drainage specialties, custom and manufactured

C. Cavity wall flashings

D. Built-in gutters, hung gutters, downspouts and downspout boots

E. Reconfiguration of existing gutter liners as indicated.

F. The work of the Section is included in both the Base Bid and specific Contract Line Items. See Section 01 27 00, “Contract Line Items” for additional information.

1.2 RELATED WORK

A. Division 1 requirements

B. Section 04 03 22, “Historic Brick Masonry Restoration”

C. Section 04 03 32, “Historic Stone Masonry Restoration”

D. Section 04 20 00, “Unit Masonry”

E. Section 06 16 00, “Sheathing”

F. Section 06 40 13, “Exterior Architectural Woodwork”

G. Section 07 27 26, “Weather Barriers”

H. Section 07 53 23, “EPDM Roofing”

I. Section 07 61 00, “Sheet Metal Roofing”

1.3 SUBMITTALS

A. Shop Drawings: For custom-fabricated sheet metal flashings, drainage specialties and roof hatch cladding.

1. Include plans, elevations, sections, and attachment details.

2. Distinguish between shop- and field-assembled work.

3. Include identification of finish for each item.

4. Include pattern of seams and details of termination points, expansion joints and expansion-joint covers, direction of expansion, roof-penetration flashing, and connections to adjoining work.

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B. Product Data

1. Copper, laminated copper, aluminum, stainless steel, galvanized steel and lead flashing materials

2. Accessory materials; solder, flux, underlayment, slip sheet, fasteners, etc.

3. Downspouts and manufactured roof drainage specialties

C. Samples: Submit 12-in. square samples of each type of new sheet metal required.

1.4 QUALITY ASSURANCE

A. Fabricator Qualifications: Employs skilled workers who custom fabricate sheet metal flashing and trim similar to that required for this Project and whose products have a record of successful in-service performance.

B. Contractor shall warrant new custom-fabricated sheet metal work against failures in material and/or workmanship for a period of five (5) years after Substantial Completion.

C. High-Performance Organic Coating Finishes: Provide manufacturer’s standard warranty against failure of finish coatings.

1.5 DELIVERY, STORAGE AND HANDLING

D. Deliver new flashing and sheet metal materials, gutters and downspouts to the site in manufacturer’s protective packaging. Do not remove protective wrapping until ready for installation. Reject delivery of any damaged materials.

E. Store new metal materials in a secure area away from general construction operations. Flashing materials, gutters and downspouts shall be stored off the ground, supported to prevent sagging. Protect new sheet metal from abrasion, scratches, dents and other damage. Do not install damaged materials.

F. Handle and store new metal flashing and metal fabrications in such a way as to avoid dents, kinks and other defects in finished installation.

1.2 PROJECT CONDITIONS

A. Protect adjacent assemblies to remain during the work of this section. At a minimum, the Contractor shall:

1. Personnel working on roofs shall wear soft-soled footwear.

2. Prevent damage to eaves and gutters from ladders.

3. Protect the recently-restored wood tympanum on the east elevation from damage during installation of new roof flashings.

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B. Coordinate flashing work with other trades involved in the construction including, but not limited to, rough carpentry, finish carpentry, membrane and metal roofing, masonry and cavity wall construction to avoid delays to the project schedule.

C. Take precautions when completing flashing work during periods of windy and/or inclement weather.

Maintain tarpaulins and other protective materials on hand during roofing and flashing work.

D. Do not drop or throw debris from roof level. Provide a trash chute to direct debris to ground level in a controlled manner.

PART 2 -- PRODUCTS

2.1 METAL MATERIALS

A. Copper Sheet: ASTM B370 cold-rolled copper sheet, H00 or H01 temper, mill finish

1. Manufacturers:

a. Aurubis USA

b. Revere Copper

c. Hussey Copper

d. PMX Industries

e. Contracting Officer-approved equivalent

B. Laminated Copper Flashing

1. Description: Asphalt free copper fabric flashing, 5 ounce minimum weight.

2. Material: Copper sheet with 060 temper conforming to ASTM B370 bonded with a proprietary non-asphaltic, rubber-based adhesive, between two layers of fiberglass fabric weighing not less than 0.3 oz/sq.ft./layer with a minimum of 20x20 threads per inch.

3. Coordinate with manufacturer of air barrier and exterior sheathing to ensure adequate adhesion of laminated flashing. Supply primers, termination bars, tapes and sealants as recommended for installation by flashing manufacturer.

4. Subject to compliance with requirements, products that may be incorporated in the Work include, but are not limited to, the following:

a. Copper Sealtite 2000, Advanced Building Products, Inc.

b. Multi-Flash 500 Series Asphalt Free, York Manufacturing, Inc.

c. Contracting Officer-approved equivalent.

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C. Tin-Zinc Coated Copper Sheet: ASTM B 370 cold-rolled copper sheet, H00 temper, hot-dipped in 50-50 Zinc-Tin alloy

1. Downspouts: 16 oz.

2. Manufacturers:

a. Revere Copper, Rome, NY

b. Wieland Metal Services, Alliance, OH

c. Contracting Officer-approved equivalent

D. Aluminum Sheet: ASTM B 209, alloy as standard with manufacturer for finish required, with temper as required to suit forming operations and performance required.

1. Box gutters and hangers: Three-Coat Fluoropolymer: AAMA 2605. Fluoropolymer finish containing not less than 70 percent PVDF resin by weight in both color coat and clear topcoat.

Prepare, pretreat, and apply coating to exposed metal surfaces to comply with coating and resin manufacturers' written instructions.

a. Color: Custom bronze color to match curtain wall framing

2. Downspouts: Three-Coat Fluoropolymer: AAMA 2605. Fluoropolymer finish containing not less than 70 percent PVDF resin by weight in both color coat and clear topcoat. Prepare, pretreat, and apply coating to exposed metal surfaces to comply with coating and resin manufacturers' written instructions.

a. Color: Custom bronze color to match curtain wall framing

3. Flashing: Three-Coat Fluoropolymer: AAMA 2605. Fluoropolymer finish containing not less than 70 percent PVDF resin by weight in both color coat and clear topcoat. Prepare, pretreat, and apply coating to exposed metal surfaces to comply with coating and resin manufacturers' written instructions.

a. Color: Custom bronze color to match curtain wall framing.

E. Stainless Steel Sheet: ASTM A 240, Type 304, dead soft, fully annealed; 2D dull, cold rolled finish.

Thickness as indicated.

F. Galvanized Steel Sheet: Zinc-coated (galvanized) steel sheet according to ASTM A 653, G90 coating designation. Thickness as indicated.

G. Lead Sheet: ASTM B 749; 2.5 lb/sq ft.

2.2 UNDERLAYMENTS

A. Felts: ASTM D226, Type II (No. 30), asphalt-saturated organic felts

B. Slip Sheet: Rosin-sized building paper, 3 lb/100 sq. ft. minimum

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C. Self-Adhering, High-Temperature Sheet Underlayment: Minimum 30 mils thick, consisting of a slip-resistant polyethylene- or polypropylene-film top surface laminated to a layer of butyl- or SBS-modified asphalt adhesive. Provide products of one of the following:

1. GCP Applied Technologies

2. TriBuilt Materials Group, Herndon, VA

3. Atlas Roofing, Atlanta, GA

4. Contracting Officer-approved equivalent

D. Underlayment Adhesive: Cold-Applied Polymer-Modified Asphalt Adhesive: Underlayment manufacturer's standard solvent-and asbestos-free, cold-applied adhesive

2.3 DRAINAGE SPECIALTIES

A. Wall nozzle: Cast bronze downspout nozzle with wall flange and no-hub inlet connection.

1. Basis of Design: Series 25010-Z Series as manufactured by Josam, Michigan City, IN

2. Alternate manufacturers:

a. Jay R. Smith

b. Sun

c. Contracting Officer-approved equivalent.

2.4 ACCESSORY MATERIALS

A. Solder:

1. ASTM B32, with maximum lead content of 0.2 percent.

2. For Stainless Steel: ASTM B 32, Grade Sn60, with acid flux of type recommended by stainless-steel sheet manufacturer.

3. For Zinc-Coated (Galvanized) Steel: ASTM B 32, Grade Sn50, 50 percent tin and 50 percent lead or Grade Sn60, 60 percent tin and 40 percent lead

B. Fasteners:

1. Tin-Zinc-Coated Copper: Copper, hardware bronze, or passivated Series 300 stainless steel.

2. Aluminum: Passivated Series 300 stainless steel

3. Galvanized steel: Series 300 stainless steel or hot-dip galvanized steel according to ASTM A 153 or ASTM F 2329

C. Bituminous Coating: Cold-applied asphalt emulsion according to ASTM D1187

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D. Butyl Sealant: ASTM C1311, single-component, solvent-release butyl rubber sealant;

polyisobutylene plasticized; heavy bodied for hooked-type expansion joints

2.5 FABRICATION, GENERAL

A. General: Custom fabricate sheet metal flashing and trim to comply with details shown and recommendations in cited sheet metal standard that apply to design, dimensions, geometry, metal thickness, and other characteristics of item required. Fabricate sheet metal flashing and trim in shop to greatest extent possible.

1. Obtain field measurements for accurate fit before shop fabrication.

2. Form sheet metal flashing and trim to fit substrates without excessive oil canning, buckling, and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems.

3. Conceal fasteners and expansion provisions where possible. Do not use exposed fasteners on faces exposed to view.

B. Expansion Provisions: Form metal for thermal expansion of exposed flashing and trim.

1. Form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with butyl sealant concealed within joints.

2. Use lapped expansion joints only where indicated on Drawings.

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

D. Fabricate cleats and attachment devices from same material as accessory being anchored or from compatible, noncorrosive metal.

E. Fabricate cleats and attachment devices of sizes as recommended by cited sheet metal standard for application, but not less than thickness of metal being secured.

F. Seams for Copper and Tin-Zinc-Coated Copper: Fabricate nonmoving seams with flat-lock seams.

Tin edges to be seamed, form seams, and solder.

G. Seams for Aluminum: Fabricate nonmoving seams with flat-lock seams. Form seams and seal with epoxy seam sealer. Rivet joints where necessary for strength.

2.6 ROOF-DRAINAGE SHEET METAL FABRICATIONS

A. Copper Flashings: Roof Flashing, Counterflashing, Edge Strips and Aprons: Thickness as noted on Drawings

B. Built-in Gutters: Fabricate to cross section required, with riveted and soldered joints, complete with end pieces, outlet tubes, and other special accessories as required. Fabricate in minimum 96-inch-long sections. Fabricate expansion joints and accessories from same metal as gutters unless otherwise indicated.

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1. Accessories: Copper wire downspout strainer, 3” x 4”.

2. Fabricate from the following materials:

a. Copper: 20 oz./sq. ft. weight.

b. Cleats to be same gauge as metal to be fastened or as indicated.

c. Outlet Tubes: 20 oz.; 3” x 4”

d. Gutter Cap Flashing: 20 oz.

B. Hung Gutters: Aluminum; .040” thick. 7-inch width box gutter, dark bronze finish.

1. Provide aluminum box gutter with roof flange, internal support brackets and shop-fabricated end caps.

C. Downspouts: Fabricate downspouts to dimensions indicated, complete with mitered elbows. Furnish with metal hangers from same material as downspouts and anchors. Shop-fabricate elbows.

1. Hanger Style: Strap to be selected by Contracting Officer from manufacturer’s standard.

2. Fabricate from the following materials:

a. Existing Building: Copper: 16 oz./sq. ft. weight; 5-inch diameter round

b. New Addition (At pole gutters): Tin/Zinc-Coated Copper; 16 oz/sq. ft, weight; 3” x 4” plain rectangle

c. New Addition (At hung gutters): Aluminum, .040 inch thick, plain square 3” x 4”, dark bronze finish

D. Splash Pans: Fabricate to dimensions and shape required and from the following materials:

1. Aluminum: 0.040 inch thick

E. Copings: Fabricate in minimum 96-inch-long, but not exceeding 12-foot-long, sections. Fabricate joint plates of same thickness as copings. Furnish with continuous cleats to support edge of external leg and interior leg. Miter corners, solder or weld watertight. Shop fabricate interior and exterior corners.

1. Fabricate from the Following Materials:

a. Copper: 16 oz. secured with 20 oz. continuous cleat as indicated.

F. Low-Slope Roof Edge Flashing and Fascia Cap at Curtain Wall: Fabricate in minimum 96-inch-long, but not exceeding 12-foot-long sections. Furnish with 6-inch-wide, joint cover plates.

1. Fabricate from the Following Materials:

1. Aluminum: 0.050 inch thick; dark bronze finish

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F. Roof Hatch cladding: Copper, 16 oz.

G. Roof edge: Copper, 20 oz..

2.7 CAST IRON DRAINAGE SPECIALTIES

A. Downspout Boots (New Addition):

2. Materials:

a. Cast iron; ASTM A 48, Class 30

b. Dimensions and sections as indicated on Drawings.

c. Provide cleanout access with plug

3. Manufacturers:

a. Basis of Design: A4436A, J. R. Hoe, Middlesboro, KY

b. Neenah Foundries, Neenah, WI

c. Zurn Industries, Erie, PA

d. Contracting Officer-approved equivalent

B. Downspout Boots (Existing Building)

1. Materials:

a. Cast iron; ASTM A 48, Class 30

b. Straight boot; Circular inlet to accommodate 5” diameter downspout; circular outlet

c. Boot length to match existing. Assume 24-inch length for bidding purposes.

2. Manufacturers:

a. Basis of Design: Model B26C, Barry Pattern & Foundry, Birmingham, AL

b. Neenah Foundries, Neenah, WI

c. J. R. Hoe, Middlesboro, KY

d. Zurn Industries, Erie, PA

e. Contracting Officer-approved equivalent

2.8 WALL SHEET METAL FABRICATIONS

A. Through-Wall Flashing: Laminated copper

PART 3 - EXECUTION

3.1 UNDERLAYMENT INSTALLATION

A. Felt Underlayment: Install felt underlayment, wrinkle free, using adhesive to minimize use of mechanical fasteners under sheet metal flashing and trim. Apply in shingle fashion to shed water, with lapped joints of not less than 2 inches.

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B. Self-Adhering Sheet Underlayment: Install self-adhering sheet underlayment, wrinkle free. Prime substrate if recommended by underlayment manufacturer. Comply with temperature restrictions of underlayment manufacturer for installation; use primer for installing underlayment at low temperatures. Apply in shingle fashion to shed water, with end laps of not less than 6 inches staggered 24 inches between courses. Overlap side edges not less than 3-1/2 inches. Roll laps and edges with roller. Cover underlayment within 14 days.

3.2 INSTALLATION, GENERAL

A. General: Anchor sheet metal flashing and trim and other components of the Work securely in place, with provisions for thermal and structural movement. Use fasteners, solder, protective coatings, separators, sealants, and other miscellaneous items as required to complete sheet metal flashing and trim system.

1. Install sheet metal flashing and trim true to line, levels, and slopes. Provide uniform, neat seams with minimum exposure of solder, welds, and sealant.

2. Install sheet metal flashing and trim to fit substrates and to result in watertight performance.

Verify shapes and dimensions of surfaces to be covered before fabricating sheet metal.

3. Space cleats not more than 12 inches apart. Attach each cleat with at least two fasteners. Bend tabs over fasteners.

4. Install exposed sheet metal flashing and trim with limited oil canning, and free of buckling and tool marks.

5. Torch cutting of sheet metal flashing and trim is not permitted.

B. Metal Protection: Where dissimilar metals contact each other, or where metal contacts pressure-treated wood or other corrosive substrates, protect against galvanic action or corrosion by painting contact surfaces with bituminous coating or by other permanent separation as recommended by sheet metal manufacturer or cited sheet metal standard.

1. Underlayment: Where installing sheet metal flashing and trim directly on cementitious or wood substrates, install underlayment and cover with slip sheet.

C. Expansion Provisions: Provide for thermal expansion of exposed flashing and trim. Space movement joints at maximum of 10 feet with no joints within 24 inches of corner or intersection.

1. Form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with sealant concealed within joints.

2. Use lapped expansion joints only if indicated on approved shop drawings.

D. Fasteners: Use fastener sizes that penetrate wood blocking or sheathing not less than 1-1/4 inches for nails and not less than 3/4 inch for wood screws.

E. Conceal fasteners and expansion provisions where possible in exposed work and locate to minimize possibility of leakage. Cover and seal fasteners and anchors as required for a tight installation.

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F. Seal joints as required for watertight construction. Prepare joints and apply sealants to comply with requirements in Section 07 92 00 "Joint Sealants."

G. Soldered Joints: Clean surfaces to be soldered, removing oils and foreign matter. Pre-tin edges of sheets with solder to width of 1-1/2 inches; however, reduce pre-tinning where pre-tinned surface would show in completed Work.

1. Do not use torches for soldering.

2. Heat surfaces to receive solder, and flow solder into joint. Fill joint completely. Completely remove flux and spatter from exposed surfaces.

3. Copper Soldering: Tin edges of uncoated sheets, using solder for copper.

H. Rivets: Rivet joints in uncoated aluminum where necessary for strength.

3.3 ROOF-DRAINAGE SYSTEM INSTALLATION

A. General: Install sheet metal roof-drainage items to produce complete roof-drainage system according to cited sheet metal standard unless otherwise indicated. Coordinate installation of roof perimeter flashing with installation of roof-drainage system.

B. Built-in Gutters: Join sections with riveted and soldered joints. Provide for thermal expansion. Slope to downspouts. Provide end closures and seal watertight with sealant.

1. Install underlayment layer in built-in gutter trough and extend to drip edge at eaves and under underlayment on roof sheathing. Lap sides minimum of 2 inches over underlying course. Lap ends minimum of 4 inches. Stagger end laps between succeeding courses at least 72 inches.

Fasten with roofing nails. Install slip sheet over underlayment.

2. Install gutter with expansion joints at locations indicated, but not exceeding, 50 feet apart.

Install expansion-joint caps.

C. Downspouts: Join sections with 1-1/2-inch telescoping joints. Provide hangers with fasteners designed to hold downspouts securely to walls. Locate hangers at top and bottom and at approximately 60 inches o.c.

D. Splash Pans: Install where downspouts discharge on low-slope roofs. Set in asphalt roofing cement or elastomeric sealant compatible with the substrate.

E. Parapet Scuppers: Continuously support scupper, set to correct elevation, and seal flanges to interior wall face, over cants or tapered edge strips, and under roofing membrane.

F. Expansion-Joint Covers: Install expansion-joint covers at locations and of configuration indicated.

Lap joints minimum of 4 inches in direction of water flow.

3.4 ROOF FLASHING INSTALLATION

A. General: Install sheet metal flashing and trim to comply with performance requirements, sheet metal manufacturer's written installation instructions, and cited sheet metal standard. Provide concealed

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fasteners where possible, and set units true to line, levels, and slopes. Install work with laps, joints, and seams that are permanently watertight and weather resistant.

B. Roof Edge Flashing: Anchor to resist uplift and outward forces according to recommendations in cited sheet metal standard unless otherwise indicated. Interlock bottom edge of roof edge flashing with continuous cleat anchored to substrate.

C. Pipe or Post Counterflashing: Install counterflashing umbrella with close-fitting collar with top edge flared for elastomeric sealant, extending minimum of 4 inches over base flashing. Install stainless-steel draw band and tighten.

D. Counterflashing: Coordinate installation of counterflashing with installation of base flashing. Insert counterflashing in reglets or receivers and fit tightly to base flashing. Extend counterflashing 4 inches over base flashing. Lap counterflashing joints minimum of 4 inches.

E. Roof-Penetration Flashing: Coordinate installation of roof-penetration flashing with installation of roofing and other items penetrating roof. Seal with elastomeric or butyl sealant and clamp flashing to pipes that penetrate roof.

3.5 WALL FLASHING INSTALLATION

A. General: Install sheet metal wall flashing to intercept and exclude penetrating moisture according to cited sheet metal standard unless otherwise indicated. Coordinate installation of wall flashing with installation of wall-opening components such as windows, doors, and louvers.

B. Parapet Caps: Anchor to resist uplift and outward forces according to recommendations in cited sheet metal standard unless otherwise indicated.

C. Through-Wall Flashing: Installation of through-wall flashing is specified in Section 04 20 00 "Unit Masonry" and Section 07 27 26 "Weather Barriers”.

D. Install laminated flashing in accordance with manufacturer's recommendations. Where required, provide for movement at joints by forming loops or bellows in width of flashing. Locate cover or filler strips at joints to facilitate complete drainage of water from flashing. Seam adjacent flashing sheets with adhesive, seal and anchor edges in accordance with manufacturer's recommendations.

1. Coordinate installation of laminated flashing in cavity walls with manufacturers of specified weather and air barrier to verify compatibility and adhesion of flashing products and identify the need for primers and/or additional fastening.

3.6 CLEANING AND PROTECTION

A. Clean exposed metal surfaces of substances that interfere with uniform oxidation and weathering.

B. Clean and neutralize flux materials. Clean off excess solder.

C. Clean off excess sealants.

D. Remove temporary protective coverings and strippable films as sheet metal flashing and trim are installed unless otherwise indicated in manufacturer's written installation instructions.

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END OF SECTION 07 62 00

H. Rivets: Rivet joints in uncoated aluminum where necessary for strength.