SECTION 07620

SHEET METAL FLASHING AND TRIM

PART	GENERAL

SECTION INCLUDES

[Coping,] [parapet,] [cap,] [sill,] [lintel,] [and] [________] flashings.

Facias, [scuppers,] [pitch pockets,] [snow guards,] [and] [________].

Counterflashings over [bituminous,] [________] base flashings.

Counterflashings for [roof hatches,] [skylights,] [and] [________].

Counterflashings at roof mounted equipment and vent stacks.

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section [______-____________]: Placement of flashing reglets and accessories.

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

Section [______-____________]: Prepainted metal for [flashings] [________] work associated with [________].

Section [______-____________]: Preformed [flashings.] [________.]

RELATED SECTIONS

[Section [______-____________]: Precast concrete splash pads at downspout outlets.]

Section 06114 - Wood Blocking and Curbing: Wood blocking [and battens] for metal roofing substrate profiles.

Section [______-____________]: Roofing system.

Section 07611 - Custom Sheet Metal Roofing.

Section 07631 - Gutters and Downspouts.

Section 07724 - Roof Hatches.

Section [07810 - Plastic Unit Skylights.] [Metal Framed Skylights.]

Section 07900 - Joint Sealers.

Section 09900 - Painting: [Prime and] finish painting.

Section [______-____________]: Roof curbs for mechanical equipment.

Section [______-____________]: Flashing sleeves and collars for mechanical items protruding through roofing membrane.

Section [______-____________]: Roof curbs for electrical equipment.

Section [______-____________]: Flashing sleeves and collars for electrical items protruding through roofing membrane.

REFERENCES

AISI (American Iron and Steel Institute) - Stainless Steel - Uses in Architecture.

ASTM A167 - Stainless and Heat-Resisting Chromium-Nickel Steel Plate.

ASTM A525 - Steel Sheet, Zinc Coated, (Galvanized) by the Hot-Dip Process.

ASTM B32 - Solder Metal.

ASTM B209 - Aluminum and Alloy Sheet and Plate.

ASTM B370 - Copper Sheet and Strip for Building Construction.

ASTM B486 - Paste Solder.

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

ASTM D4586 - Asphalt Roof Cement, Asbestos-Free.

CDA (Copper Development Association) - Contemporary Copper, A Handbook of Sheet Copper Fundamentals, Design, Details and Specifications.

CDA - Copper Roofing - A Practical Handbook.

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

NRCA (National Roofing Contractors Association) - Roofing Manual.

SMACNA - Architectural Sheet Metal Manual.

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

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

Samples: Submit [two] [_______] samples, [____x____] inch ([____x____] mm) in size illustrating typical [standing seam,] [seam,] [external corner,] [internal corner,] [valley,] [ridge,] [junction to vertical dissimilar surface,] material and finish.

Submit [two] [____] samples [____x____] inch ([____x____] mm) in size illustrating metal finish color.

QUALITY ASSURANCE

Perform work in accordance with [AISI] [CDA] [SMACNA] [NRCA] [________] standard details and requirements.

Maintain [one copy] [[____] copies] of [each] document on site.

QUALIFICATIONS

Fabricator and Installer: Company specializing in sheet metal flashing work with [____] years [documented] experience.

PRE-INSTALLATION CONFERENCE

Convene [one] [_____] week prior to commencing work of this section, under provisions of Section [01039.] [________.]

DELIVERY, STORAGE, AND HANDLING

Deliver, store, protect and handle products to site under provisions of Section [01600.] [________.]

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

Prevent contact with materials which may cause discoloration or staining.

COORDINATION

Coordinate work under provisions of Section [01039.] [________.]

Coordinate with the work of Section [________] for installing flashing reglets and Section [________] for [________].

PART	PRODUCTS

SHEET MATERIALS

Copper: ASTM B370, cold rolled [[20] [24] [____] oz/sq ft] [[0.027] [0.032] [____] inch ([0.7] [0.8] [____] mm) thick]; [natural] [lacquered] finish.

****** [OR] ******

Pre-Coated Galvanized Steel: ASTM A446, Grade A, [G90] [____] zinc coating; [____] gage ([____] mm) core steel, shop pre-coated with [modified silicone] [PVDF] [________] coating of [________] color [as selected.] [to match [________.]

****** [OR] ******

Galvanized Steel: ASTM A446, Grade A, [G90] [____] zinc coating; [24] [26] [____] gage ([0.6] [0.5] [____] mm) core steel.

****** [OR] ******

Terne Coated Steel: [____] inch ([____] mm) [copper bearing carbon steel] [stainless steel conforming to ASTM A167, Type [304] [____]; core material with [0.015] [____] inch ([0.4] [____] mm) terne alloy coating on both sides of core metal.

****** [OR] ******

Lead Coated Copper: [ASTM B101 Type 1, Class A, soft temper, [____] oz/sq ft ([____] gm/sq m).] [________.]

****** [OR] ******

Aluminum Sheet: ASTM B209, [____] alloy, [____] temper; [____] inch ([____] mm) thick; [mill] [plain] [stucco embossed] finish [, shop pre-coated with [________] coating of [________] color [as selected] [to match [________] finish].

****** [OR] ******

Stainless Steel: ASTM A167, Type [304] [____], soft temper, [____] inch ([____] mm) thick; [smooth] [[________] patterned] [4D] [________] finish.

ACCESSORIES

Fasteners: [Galvanized steel] [Aluminum] [Stainless steel] [Copper] [Same material and finish as flashing metal] [, with soft neoprene washers].

Underlayment: [ASTM [D226] [D2178], No. [15] [____] asphalt saturated roofing felt.] [FS L-P-512, 6 mil (0.15 mm) polyethylene.] [________.]

Slip Sheet: [Rosin sized building paper.] [________.]

Primer: [Zinc chromate] [Galvanized iron] [Iron oxide linseed oil] [________] type.

Protective Backing Paint: [Zinc chromate alkyd.] [Bituminous.] [________.]

Sealant: [Acrylic] [Polyurethane] [________] type, [specified in Section [07900] [________].] [[________] manufactured by [____________].]

Bedding Compound: [Rubber-asphalt] [Butyl] [________] type, [________] manufactured by [____________].

Plastic Cement: ASTM D4586, Type [I.] [II.]

Reglets: [Surface mounted] [Recessed] type, [galvanized steel] [rigid extruded PVC] [________]; [face and ends covered with plastic tape;] [________] manufactured by [____________].

Gutter and Downspout Anchorage Devices: [SMACNA requirements.] [Type recommended by fabricator.]

Gutter Supports: [Brackets.] [Straps.] [Spikes and ferrules.]

Downspout Supports: [Brackets.] [Straps.]

Solder: ASTM B32; [50/50] [____] type.

****** [OR] ******

Paste Solder: ASTM B486; [____] type.

Flux: [FS O-F-506.] [________.]

COMPONENTS

Gutters: [Rectangular] [Square] [Semi-circular] SMACNA style profile.

Downspouts: [Rectangular] [Square] [Round] [________] profile.

Accessories: Profiled to suit gutters and downspouts.

Splash Pans: Same metal type as downspouts, formed to [____x____] inches ([____x____] mm) size; rolled sides of [____] inch ([____] mm) high for inverted pan placement.

****** [OR] ******

[Splash Pads: Precast concrete type, of [size] [sizes] and profiles indicated; minimum [3000] [________] psi ([21] [____] MPa) at 28 days, with minimum 5 percent air entrainment.]

Downspout [Boots] [Shoes]: [Steel.] [Cast iron.] [Plastic.] [________.]

FABRICATION

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

Fabricate cleats of [[________] type sheet metal,] [same material as sheet,] minimum [____] inches ([____] mm) wide, interlockable with sheet.

Form pieces [in longest possible lengths.] [in single length sheets.]

Hem exposed edges on underside [1/2] [____] inch ([13] [____] mm); miter and seam corners.

Form material with [standing] [batten] [flat lock] seams.

Pretin edges of [copper] [________] sheet. Solder shop formed metal joints. After soldering, remove flux. Wipe and wash solder joints clean. Weather seal joints.

Fabricate corners from one piece with minimum [18] [____] inch ([450] [____] mm) long legs; [seam] [solder] for rigidity, seal with sealant.

Fabricate vertical faces with bottom edge formed outward 1/4 inch (6 mm) and hemmed to form drip.

Fabricate flashings to allow toe to extend [2] [____] inches ([50] [____] mm) over roofing [gravel] [paver] [________]. Return and brake edges.

Form sheet metal pans (pitch pockets) [6] [____] inch ([150] [____] mm) nominal size, with [3] [____] inch ([75] [____] mm) upstand, and 4 inch (100 mm) flanges.

Fabricate snow guards [in accordance with SMACNA Plate 159.] [as detailed.]

FINISH

[Prepare [copper] [________] surfaces in accordance with Section [09900] [________].]

Back paint concealed metal surfaces with protective backing paint to a minimum dry film thickness of [15] [____] mil ([0.4] [____] mm).

PART	EXECUTION

EXAMINATION

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 flashings are in place, sealed, and secure.

PREPARATION

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

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

INSTALLATION

Conform to drawing details [____] [____] [____] included in the [AISI] [CDA] [SMACNA] [NRCA] manual.

Insert flashings into reglets to form tight fit. Secure in place with [lead] [plastic] wedges. [Pack remaining spaces with lead wool.] Seal flashings into reglets with sealant.

****** [OR] ******

Secure flashings in place using concealed fasteners. [Use exposed fasteners only where permitted.]

Apply plastic cement compound between metal flashings and felt flashings.

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

Seal metal joints watertight.

****** [OR] ******

Solder metal joints for full metal surface contact. After soldering, wash metal clean with neutralizing solution and rinse with water.

[Install snow guards [____] inch ([____] mm) up slope from eaves [and valleys].]

Secure gutters and downspouts in place using [concealed] fasteners.

Slope gutters [1/4] [____] inch per foot ([20] [____] mm/m) minimum.

Connect downspouts to [downspout boots] [downspout shoes] [storm sewer] [________] system. [Grout] [Seal] connection watertight.

Set splash [pans] [pads] under downspouts. [Set in place with [________] ].

Seal metal joints watertight.

FIELD QUALITY CONTROL

Field inspection will be performed under provisions of Section [01400.] [________.]

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

SCHEDULE

Location	Metal Type	Thickness	Finish

North Wing	Precoated steel	22 ga	Dark Blue

Penthouse	Galvanized steel	24 ga	Site painted

END OF SECTION