07 60 00 Flashg and Sheet Met.pdf

Annex Addition to B3010

SECTION 07 60 00 Page 1

SECTION 07 60 00

FLASHING AND SHEET METAL

PART 1 GENERAL

1.1 REFERENCES

See Scope of Work for additional information.

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM A 167 (1999; R 2004) Standard Specification for

Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip

ASTM B 209 (2007) Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate

ASTM B 32 (2004) Standard Specification for Solder

Metal

ASTM B 370 (2003) Standard Specification for Copper

Sheet and Strip for Building Construction

ASTM B 69 (2001a; R 2005) Standard Specification for

Rolled Zinc

ASTM D 1784 (2007) Standard Specification for Rigid

Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds

ASTM D 226 (2006) Standard Specification for Asphalt-

Saturated Organic Felt Used in Roofing and Waterproofing

ASTM D 41 (2005) Asphalt Primer Used in Roofing, Dampproofing, and Waterproofing

ASTM D 4586 (2007) Asphalt Roof Cement, Asbestos-Free

SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION

(SMACNA)

SMACNA Arch. Manual (2006) Architectural Sheet Metal Manual

1.2 GENERAL REQUIREMENTS

SECTION 07 60 00 Page 2

Finished sheet metalwork will form a weathertight construction without waves, warps, buckles, fastening stresses or distortion, which allows for expansion and contraction. Sheet metal mechanic is responsible for cutting, fitting, drilling, and other operations in connection with sheet metal required to accommodate the work of other trades. Coordinate installation of sheet metal items used in conjunction with roofing with roofing work to permit continuous roofing operations.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation.

Submit the following in accordance with Section 01 33 00 SUBMITTAL

PROCEDURES:

SD-02 Shop Drawings

Covering on flat, sloped, or curved surfaces; G

Valley Flashing; G

Base flashing; G

Counterflashing; G

Flashing at roof penetrations; G

Reglets; G

Drip edge; G

Indicate thicknesses, dimensions, fastenings and anchoring methods, expansion joints, and other provisions necessary for thermal expansion and contraction. Scaled manufacturer's catalog data may be submitted for factory fabricated items.

1.4 DELIVERY, HANDLING, AND STORAGE

Package and protect materials during shipment. Uncrate and inspect materials for damage, dampness, and wet-storage stains upon delivery to the job site. Remove from the site and replace damaged materials that cannot be restored to like-new condition. Handle sheet metal items to avoid damage to surfaces, edges, and ends. Materials shall be store in dry, weather-tight and ventilated areas until immediately before installation.

PART 2 PRODUCTS

2.1 MATERIALS

Use any metal listed by SMACNA Arch. Manual for a particular item, unless otherwise specified or indicated. Conform to the requirements specified and to the thicknesses and configurations established in SMACNA Arch. Manual for the materials. Different items need not be of the same metal, except that if copper is selected for any exposed item, all exposed items must be copper.

Furnish sheet metal items in 2400 to 3000 mm( 8 to 10 foot) lengths. Single pieces less than 2400 mm( 8 feet) long may be used to connect to factory-

SECTION 07 60 00 Page 3 fabricated inside and outside corners, and at ends of runs. Factory fabricate corner pieces with minimum 300 mm( 12 inch) legs. Provide accessories and other items essential to complete the sheet metal installation. Provide accessories made of the same or compatible materials as the items to which they are applied. Fabricate sheet metal items of the materials specified below and to the gage, thickness, or weight shown in Table I at the end of this section. Provide sheet metal items with mill finish unless specified otherwise. Where more than one material is listed for a particular item in Table I, each is acceptable and may be used except as follows:

2.1.1 Exposed Sheet Metal Items

Exposed sheet metal shall be of copper unless otherwise indicated. Consider the following as exposed sheet metal: gutters, including hangers;

downspouts and straps; flashing for wall openings, roof edge trim, fascias and eave flashing; roof valley, base, wall reglets, expansion joints and related accessories.

2.1.2 Copper, Sheet and Strip

ASTM B 370, cold-rolled temper, H 00 (standard).

ASTM B 101.

2.1.3 Lead Sheet

Minimum weight 19.6 kilograms per square meter( 4 pounds per square foot).

2.1.4 Steel Sheet, Zinc-Coated (Galvanized)

ASTM A 653/A 653M.

2.1.4.1 Finish

Exposed exterior items of zinc-coated steel sheet must have a baked-on, factory-applied color coating of polyvinylidene fluoride or other equivalent fluorocarbon coating applied after metal substrates have been cleaned and pretreated. Provide finish coating dry-film thickness of 0.020 to 0.033 mm(

0.8 to 1.3 mils).

2.1.5 Not Used

2.1.6 Stainless Steel

ASTM A 167, Type 302 or 304, 2D Finish, fully annealed, dead-soft temper.

2.1.7 Finish

Exposed exterior sheet metal items of aluminum must have a baked-on, factory-applied color coating of polyvinylidene fluoride (PVF2) or other equivalent fluorocarbon coating applied after metal substrates have been cleaned and pretreated. Provide finish coating dry-film thickness of 0.020 to 0.033 mm( 0.8 to 1.3 mils).

SECTION 07 60 00 Page 4

2.1.8 Solder

ASTM B 32, 95-5 tin-antimony.

2.1.9 Bituminous Plastic Cement

ASTM D 4586, Type I.

2.1.10 Roofing Felt

ASTM D 226 Type I

2.1.11 Asphalt Primer

ASTM D 41.

2.1.12 Fasteners

Use the same metal or a metal compatible with the item fastened. Use stainless steel fasteners to fasten dissimilar materials.

PART 3 EXECUTION

3.1 INSTALLATION

3.1.1 Metal Roofing flashing and accessories

3.1.1.1 Flat Copper, Zinc, copper-coated Stainless Steel Roofing

Before applying roofing, cover deck with rosin-sized roofing felt. Lap 50 mm( 2 inch) at joints and secure in place with roofing nails. Using solder of equal parts tin and lead, solder slowly with well-heated irons to thoroughly heat sheet and completely sweat solder through full width of seam. Tin edges of copper to be soldered at least 20 mm( 3/4 inch) before sheets are locked. Use stainless nails in terne-coated steel; in copper, use solid copper or bronze roofing nails in zinc, use zinc-coated roofing nails.] Where roof decks abut vertical surfaces, turn metal roofing up vertical surfaces about 200 mm( 8 inch) where practicable; where vertical surfaces are covered with applied materials, turn up roofing behind applied materials. Use standing-seam method for roofs having rise of more than one in four( 3 inch per foot), and use flat-seam method when rise is one in four( 3 inch per foot) or less. Walking not permitted directly on metal roofs; provide approved walkways.

3.1.1.2 Flat-seam Method

Lay metal so short dimension is parallel to gutter or eave lines and so water will flow over and not into seams. Make seams by turning edges of sheet 20 mm( 3/4 inch) and lock and solder together. If sheets are laid one at a time, secure to roof deck with cleats, using three cleats to each sheet, two on long side and one on short side. Use cleats 50 mm( inch) wide, hooked over 20 mm( 3/4 inch) upturned edges of sheets, and nail to roof deck with two 25 mm( one inch) long nails. Turn back roof end of cleat over nail heads before next sheet is applied. If desired, sheets may be made into long lengths at shop by locking short dimensions together and

SECTION 07 60 00 Page 5 soldering seams thus formed. Turn long lengths 20 mm( 3/4 inch), and secure each length to roof deck by cleats spaced 300 mm( 12 inch) apart. Mallet and solder seams after pans are in place." All sheets to be same length, except as required to complete run or maintain pattern. Locate transverse joints of each panel half way between joints in adjacent sheets. Align joints of alternate sheets horizontally to produce uniform pattern, as shown in SMACNA Arch. Manual.

3.1.2 Workmanship

Make lines and angles sharp and true. Free exposed surfaces from visible wave, warp, buckle, and tool marks. Fold back exposed edges neatly to form a 13 mm( 1/2 inch) hem on the concealed side. Make sheet metal exposed to the weather watertight with provisions for expansion and contraction.

Make surfaces to receive sheet metal plumb and true, clean, even, smooth, dry, and free of defects and projections. For installation of items not shown in detail or not covered by specifications conform to the applicable requirements of SMACNA Arch. Manual, Architectural Sheet Metal Manual.

Provide sheet metal flashing in the angles formed where roof decks abut walls, curbs, ventilators, pipes, or other vertical surfaces and wherever indicated and necessary to make the work watertight. Join sheet metal items together as shown in Table II.

3.1.3 Nailing

Confine nailing of sheet metal generally to sheet metal having a maximum width of 450 mm( 18 inch). Confine nailing of flashing to one edge only.

Space nails evenly not over 75 mm( 3 inch) on center and approximately 13 mm( 1/2 inch) from edge unless otherwise specified or indicated. Face nailing will not be permitted. Where sheet metal is applied to other than wood surfaces, include in shop drawings, the locations for sleepers and nailing strips required to secure the work.

3.1.4 Cleats

Provide cleats for sheet metal 450 mm( 18 inch) and over in width. Space cleats evenly not over 300 mm( 12 inch) on center unless otherwise specified or indicated. Unless otherwise specified, provide cleats of 50 mm wide by 75 mm long( 2 inch wide by 3 inch long) and of the same material and thickness as the sheet metal being installed. Secure one end of the cleat with two nails and the cleat folded back over the nail heads. Lock the other end into the seam. Where the fastening is to be made to concrete or masonry, use screws and drive in expansion shields set in concrete or masonry. Pre tin cleats for soldered seams.

3.1.5 Bolts, Rivets, and Screws

Install bolts, rivets, and screws where indicated or required. Provide compatible washers where required to protect surface of sheet metal and to provide a watertight connection. Provide mechanically formed joints in aluminum sheets 1.0 mm (0.040 inch) or less in thickness.

3.1.6 Seams

Straight and uniform in width and height with no solder showing on the face.

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3.1.6.1 Flat-lock Seams

Finish not less than 20 mm( 3/4 inch) wide.

3.1.6.2 Lap Seams

Finish soldered seams not less than 25 mm( one inch) wide. Overlap seams not soldered, not less than 75 mm( 3 inch).

3.1.6.3 Loose-Lock Expansion Seams

Not less than 75 mm( 3 inch) wide; provide minimum 25 mm( one inch) movement within the joint. Completely fill the joints with the specified sealant, applied at not less than 3 mm( 1/8 inch) thick bed.

3.1.6.4 Flat Seams

Make seams in the direction of the flow.

3.1.7 Soldering

Where soldering is specified, apply to copper, terne-coated stainless steel, zinc-coated steel, and stainless steel items. Pretin edges of sheet metal before soldering is begun. Seal the joints in aluminum sheets of 0.040 inch or less in thickness with specified sealants. Do not solder aluminum.

3.1.7.1 Edges

Scrape or wire-brush the edges of lead-coated material to be soldered to produce a bright surface. Flux brush the seams in before soldering. Treat with soldering acid flux the edges of stainless steel to be pretinned. Seal the joints in aluminum sheets of one mm( 0.040 inch) or less in thickness with specified sealants. Do not solder aluminum.

3.1.8 Welding and Mechanical Fastening

Use welding for aluminum of thickness greater than one mm( 0.040 inch).

Aluminum one mm( 0.040 inch) or less in thickness must be butted and the space backed with formed flashing plate; or lock joined, mechanically fastened, and filled with sealant as recommended by the aluminum manufacturer.

3.1.8.1 Welding of Aluminum

Use welding of the inert gas, shield-arc type. For procedures, appearance and quality of welds, and the methods used in correcting welding work, conform to AWS D1.2/D1.2M.

3.1.8.2 Mechanical Fastening of Aluminum

Use No. 12, aluminum alloy, sheet metal screws or other suitable aluminum alloy or stainless steel fasteners. Drive fasteners in holes made with a No. 26 drill in securing side laps, end laps, and flashings. Space fasteners 300 mm( 12 inch) maximum on center. Where end lap fasteners are required to improve closure, locate the end lap fasteners not more than 50 mm( 2 inch) from the end of the overlapping sheet.

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3.1.9 Protection from Contact with Dissimilar Materials

3.1.9.1 Copper or Copper-bearing Alloys

Paint with heavy-bodied bituminous paint surfaces in contact with dissimilar metal, or separate the surfaces by means of moisture proof building felts.

3.1.9.2 Aluminum

Do not allow aluminum surfaces in direct contact with other metals except stainless steel, zinc, or zinc coating. Where aluminum contacts another metal, paint the dissimilar metal with a primer followed by two coats of aluminum paint. Where drainage from a dissimilar metal passes over aluminum, paint the dissimilar metal with a non-lead pigmented paint.

3.1.9.3 Metal Surfaces

Paint surfaces in contact with mortar, concrete, or other masonry materials with alkali-resistant coatings such as heavy-bodied bituminous paint.

3.1.9.4 Wood or Other Absorptive Materials

Paint surfaces that may become repeatedly wet and in contact with metal with two coats of aluminum paint or a coat of heavy-bodied bituminous paint.

3.1.10 Expansion and Contraction

Provide expansion and contraction joints at not more than 9750 mm( 32 foot) intervals for aluminum and at not more than 12 meter( 40 foot) intervals for other metals. Provide an additional joint where the distance between the last expansion joint and the end of the continuous run is more than half the required interval. Space joints evenly. Join extruded aluminum gravel stops and fascias by expansion and contraction joints spaced not more than 3600 mm( 12 feet) apart.

3.1.11 Base Flashing

Lay the base flashings with each course of the roof covering, shingle fashion, where practicable, where sloped roofs abut chimneys, curbs, walls, or other vertical surfaces. Extend up vertical surfaces of the flashing not less than 200 mm( 8 inch) and not less than 100 mm( 4 inch) under the roof covering. Where finish wall coverings form a counterflashing, extend the vertical leg of the flashing up behind the applied wall covering not less than 150 mm( 6 inch). Overlap the flashing strips or shingles with the previously laid flashing not less than 75 mm( 3 inch). Fasten the strips at their upper edge to the deck. Horizontal flashing at vertical surfaces must extend vertically above the roof surface and fastened at their upper edge to the deck a minimum of 6 inch on center with hex headed, galvanized shielded screws a minimum of 2-inch lap of any surface. Solder end laps and provide for expansion and contraction. Extend the metal flashing over crickets at the up-slope side of chimneys, curbs, and similar vertical surfaces extending through sloping roofs, the metal flashings. Extend the metal flashings onto the roof covering not less than 115 mm( 4.5 inch) at the lower side of chimneys, and similar vertical surfaces extending through the roof decks. Install and fit the flashings so as to be completely

SECTION 07 60 00 Page 8 weathertight. Provide factory-fabricated base flashing for interior and exterior corners. Do not use metal base flashing on built-up roofing.

3.1.12 Counterflashing

Except where indicated or specified otherwise, insert counterflashing in reglets located from 230 to 250 mm( 9 to 10 inch) above roof decks, extend down vertical surfaces over upturned vertical leg of base flashings not less than 75 mm( 3 inch). Fold the exposed edges of counterflashings 13 mm( 1/2 inch). Where stepped counterflashings are required, they may be installed in short lengths a minimum [8 inch by 8 inch] [8 inch by 10 inch] or may be of the preformed one-piece type. Provide end laps in counterflashings not less than 75 mm( 3 inch) and make it weathertight with plastic cement. Do not make lengths of metal counterflashings exceed 3000 mm( 10 feet). Form the flashings to the required shapes before installation. Factory-form the corners not less than 300 mm( 12 inch) from the angle. Secure the flashings in the reglets with lead wedges and space not more than450 mm( 18 inch) apart; on [chimneys and] [stair/elevator towers] short runs, place wedges closer together. Fill caulked-type reglets or raked joints which receive counterflashing with caulking compound. Turn up the concealed edge of counterflashings built into masonry or concrete walls not less than 6 mm( 1/4 inch) and extend not less than 50 mm( 2 inch) into the walls. Install counterflashing to provide a spring action against base flashing. [Where bituminous base flashings are provided, extend down the counter flashing as close as practicable to the top of the cant strip. Factory form counter flashing to provide spring action against the base flashing.]

3.1.13 Metal Reglets

Provide factory fabricated caulked type or friction type reglets with a minimum opening of 6 mm( 1/4 inch) and a depth of 30 mm( 1 1/4 inch), as approved.

3.1.13.1 Caulked Reglets

Provide with rounded edges and metal strap brackets or other anchors for securing to the concrete forms. Provide reglets with a core to protect them from injury during the installation. Provide built-up mitered corner pieces for internal and external angles. Wedge the flashing in the reglets with lead wedges every 450 mm( 18 inch), caulked full and solid with an approved compound.

3.1.13.2 Friction Reglets

Provide with flashing receiving slots not less than 16 mm( 5/8 inch) deep, 25 mm( one inch) jointing tongues, and upper and lower anchoring flanges installed at 24 inch maximum snaplock receiver. Insert the flashing the full depth of the slot and lock by indentations made with a dull-pointed tool, wedges, and filled with a sealant. For friction reglets, install flashing snaplock receivers at 24 inch on center maximum. When the flashing has been inserted the full depth, caulk the slot and lock [with wedges] and fill with sealant.

3.1.14 Polyvinyl Chloride Reglets Temporary Construction Installation]

SECTION 07 60 00 Page 9

Rigid polyvinyl chloride reglets ASTM D 1784, Type II, Grade 1, Class 14333- D, 0.075 inch minimum thickness may be provided in lieu of metal reglets for temporary construction.

3.1.15 Fascias

Prefabricate in the shapes and sizes indicated and in lengths not less that 2400 mm( 8 feet). Extend flange at least 100 mm( 4 inch) onto roofing.

Provide prefabricated, mitered corners internal and external corners.

Install gravel stops and fascias after all plies of the roofing membrane have been applied, but before the flood coat of bitumen is applied. Prime roof flange of gravel stops and fascias on both sides with an asphalt primer. After primer has dried, set flange on roofing membrane and strip-in.

Nail flange securely to wood nailer with large-head, barbed-shank roofing nails 38 mm( 1.5 inch) long spaced not more than 75 mm (3 inch) on center, in two staggered rows.

3.1.15.1 Edge Strip

Hook the lower edge of fascias at least 20 mm( 3/4 inch) over a continuous strip of the same material bent outward at an angle not more than 45 degrees to form a drip. Nail hook strip to a wood nailer at 150 mm( 6 inch)maximum on center. Where fastening is made to concrete or masonry, use screws spaced 300 mm( 12 inch) on center driven in expansion shields set in the concrete or masonry. Where horizontal wood nailers are slotted to provide for insulation venting, install strips to prevent obstruction of vent slots.

Where necessary, install strips over 2 mm( 1/16 inch) thick compatible spacer or washers.

3.1.15.2 Joints

Leave open the section ends of gravel stops and fascias 6 mm( 1/4 inch) and backed with a formed flashing plate, mechanically fastened in place and lapping each section end a minimum of 100 mm( 4 inch) set laps in plastic cement. Face nailing will not be permitted. Install prefabricated aluminum gravel stops and fascias in accordance with the manufacturer's printed instructions and details.

3.1.16 Metal Drip Edge

Provide a metal drip edge, designed to allow water run-off to drip free of underlying construction, at eaves and rakes prior to the application of roofing shingles. Apply directly on the wood deck at the eaves and over the underlay along the rakes. Extend back from the edge of the deck not more than 75 mm( 3 inch) and secure with compatible nails spaced not more than250 mm( 10 inch) on center along upper edge.

3.1.17 Sheet Metal Covering on Flat, Sloped, or Curved Surfaces

Except as specified or indicated otherwise, cover and flash all minor flat, sloped, or curved surfaces such as crickets, bulkheads, dormers and small decks with metal sheets of the material used for flashing; maximum size of sheets, 375 by 455 mm( 16 by 18 inch). Fasten sheets to sheathing with metal cleats. Lock seams and solder. Lock aluminum seams as recommended by aluminum manufacturer. Provide an underlayment of roofing felt for all sheet metal covering.

SECTION 07 60 00 Page 10

3.1.18 Flashing at Roof Penetrations and Equipment Supports

Provide metal flashing for all pipes, ducts, and conduits projecting through the roof surface and for equipment supports, guy wire anchors, and similar items supported by or attached to the roof deck. Goose-necks, rainhoods, power roof ventilators, and are specified in.

3.1.19 Single Pipe Vents

See Table I, footnote (d). Set flange of sleeve in bituminous plastic cement and nail 75 mm( 3 inch) on center. Bend the top of sleeve over and extend down into the vent pipe a minimum of 50 mm( 2 inch). For long runs or long rises above the deck, where it is impractical to cover the vent pipe with lead, use a two-piece formed metal housing. Set metal housing with a metal sleeve having a 100 mm( 4 inch) roof flange in bituminous plastic cement and nailed 75 mm( 3 inch) on center. Extend sleeve a minimum of 200 mm(8 inch) above the roof deck and lapped a minimum of 75 mm( 3 inch) by a metal hood secured to the vent pipe by a draw band. Seal the area of hood in contact with vent pipe with an approved sealant.

3.2 PAINTING

Field-paint sheet metal for separation of dissimilar materials.

3.2.1 Aluminum Surfaces

Shall be solvent cleaned and given one coat of zinc-molybdate primer and one coat of aluminum paint.

3.3 CLEANING

Clean exposed sheet metal work at completion of installation. Remove grease and oil films, handling marks, contamination from steel wool, fittings and drilling debris, and scrub-clean. Free the exposed metal surfaces of dents, creases, waves, scratch marks, and solder or weld marks.

3.4 REPAIRS TO FINISH

Scratches, abrasions, and minor surface defects of finish may be repaired in accordance with the manufacturer's printed instructions and as approved.

Repair damaged surfaces caused by scratches, blemishes, and variations of color and surface texture. Replace items which cannot be repaired.

3.5 FIELD QUALITY CONTROL

Establish and maintain a Quality Control Plan for sheet metal used in conjunction with roofing to assure compliance of the installed sheet metalwork with the contract requirements. Remove work that is not in compliance with the contract and replace or correct. Include quality control, but not be limited to, the following:

a. Observation of environmental conditions; number and skill level of sheet metal workers; condition of substrate.

SECTION 07 60 00 Page 11

b. Verification that specified material is provided and installed.

c. Inspection of sheet metalwork, for proper size(s) and thickness(es), fastening and joining, and proper installation.

3.5.1 Procedure

Submit for approval prior to start of roofing work. Include a checklist of points to be observed. Document the actual quality control observations and inspections. Furnish a copy of the documentation to the Contracting Officer at the end of each day.

TABLE I Metric. SHEET METAL WEIGHTS, THICKNESSES, AND GAGES

Copper, Terne- Zinc-kilograms Coated Coated Per Stainless Stainless Steel, Sheet Metal Items Square Aluminum, Steel, Steel, mm meter mm mm mm

Waterstop-bellows or flanged, U-type..... 4.9 - 0.38 0.38 - Covering on minor flat, pitched or curved surfaces............ 6.125 1.02 0.46 0.46 -

Flashings:

Base................ 6.125 1.02 0.46 0.46 0.6 Cap (Counter-flashing) 4.9 0.81 0.38 0.38 0.5 Spandrel beam....... 3.1 - 0.25 0.25 - Bond barrier........ 4.9 - 0.38 0.38 - Stepped............. 4.9 0.81 0.38 0.38 - Pipe vent sleeve(d) Gravel stops and fascias:

Extrusions.......... - 1.91 - - - Sheets, corrugated.......... 4.9 0.81 0.38 0.38 - Sheets, smooth...... 6.125 1.27 0.46 0.46 0.6 Edge strip.......... 7.35 1.27 0.635 - - Reglets (c)......... 3.1 - 0.25 0.25 -

TABLE II Metric. SHEET METAL JOINTS

TYPE OF JOINT

Flashings

Base 25 mm 25 mm flat locked, Aluminum producer's 75 mm lap soldered; sealed; recommended hard for expansion 75 mm lap for setting sealant for

SECTION 07 60 00 Page 12 joint expansion joint locked aluminum joints. Fill each metal expansion joint with a joint sealing compound compound.

Cap-in 75 mm lap 75 mm lap Seal groove with reglet joint sealing compound.

Reglets Butt joint - - - Seal reglet groove with joint sealing compound.

Stepped 75 mm lap 75 mm lap - - -

Edge Butt Butt - - -strip

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