07 60 00 Flashing and Sheet Metal-1111(Nov).pdf

IDIQ ROOF MAINTENANCE/REPAIR/REPLACEMENT VNVP 111080

07 60 00 Flashing And Sheet Metal

Page 1 of 16 Pages

November 2011

07 60 00

FLASHING AND SHEET METAL

PART 0 - INTENT

0.1. This section covers the requirements for flashing and sheet metal work including gutters and downspouts, scuppers, splash pans.

0.2. Gravity roof ventilators, roof scuttles, louvers, and similar items are not included in this section.

PART 1 - GENERAL:

1.1. REFERENCES: 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.

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

ANSI/SPRI RD-1 (2003) Performance Standard for Retrofit Drains

AMERICAN WELDING SOCIETY (AWS)

AWS D1.2/D1.2M (2008) Structural Welding Code - Aluminum

ASTM INTERNATIONAL (ASTM)

ASTM A 167 (1999; R 2009) Standard Specification for Stainless and Heat-

Resisting Chromium-Nickel Steel Plate, Sheet, and Strip

ASTM A 308/A 308M (2006) Standard Specification for Steel Sheet, Terne (Lead-

Tin Alloy) Coated by the Hot Dip Process

ASTM A 653/A 653M (2009a) Standard Specification for Steel Sheet, Zinc-Coated

(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip

Process

ASTM B 101 (2007) Standard Specification for Lead-Coated Copper Sheet and

Strip for Building Construction

ASTM B 209/B 209M (2007) Standard Specification for Aluminum and

Aluminum-Alloy Sheet and Plate

ASTM B 221/B 221M (2008) Standard Specification for Aluminum and

Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes

ASTM B 32 (2008) Standard Specification for Solder Metal

ASTM B 370 (2009) Standard Specification for Copper Sheet and Strip for

Building Construction

ASTM B 69 (2008) Standard Specification for Rolled Zinc

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ASTM D 1784 (2008) Standard Specification for Rigid Poly(Vinyl Chloride)

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

ASTM D 226/D 226M (2009) Standard Specification for Asphalt-Saturated

Organic Felt Used in Roofing and Waterproofing

ASTM D 41 (2005) Asphalt Primer Used in Roofing, Damp proofing, and

Waterproofing

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

SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL

ASSOCIATION (SMACNA)

SMACNA 1793 (2003) Architectural Sheet Metal Manual, 6th Edition

1.2. GENERAL REQUIREMENTS: 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: Submit the following in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Covering on flat, sloped, or curved surfaces, G

Gutters, G

Downspouts, G

Expansion joints, G

Gravel stops and fascias, G

Splash pans, G

Flashing for roof drains, G

Base flashing, G

Counterflashing, G

Flashing at roof penetrations, G

Reglets, G

Scuppers, G

Copings, G

Drip edge, G

Conductor heads

Open valley flashing, G

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Eave flashing, 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.

SD-11 Closeout Submittals

Quality Control Plan

Submit for sheet metal work in accordance with paragraph entitled "Field

Quality Control."

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. Store materials in dry, weather-tight, 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 8 to 10 foot lengths. Single pieces less than 8 feet long may be used to connect to factory-fabricated inside and outside corners, and at ends of runs. Factory fabricate corner pieces with minimum 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: Must be of the same material. Consider the following as exposed sheet metal: gutters, including hangers; downspouts; gravel stops and fascias; cap, valley, steeped, base, and fascia/eave flashings and related accessories.

2.1.2. Drainage: Do not use copper for an exposed item if drainage from that item will pass over exposed masonry, stonework or other metal surfaces. In addition to the metals listed in Table I, lead-coated copper may be used for such items.

2.1.3. Copper, Sheet and Strip: ASTM B 370, cold-rolled temper, H 00 (standard).

2.1.4. Lead-Coated Copper Sheet: ASTM B 101.

2.1.5. Lead Sheet: Minimum weight 4 pounds per square foot.

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2.1.6. Steel Sheet, Zinc-Coated (Galvanized): ASTM A 653/A 653M.

2.1.6.1. 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 0.8. to 1.3. mils and color as approved for use.

2.1.7. Zinc Sheet and Strip: ASTM B 69, Type I, a minimum of 0.024 inch thick.

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

2.1.9. Terne-Coated Steel: Minimum of 14 by 20 inches with minimum of 40 pound coating per double base box. ASTM A 308/A 308M.

2.1.10. Aluminum Alloy Sheet and Plate: ASTM B 209M, ASTM B 209, anodized, clear, or color form alloy, and temper appropriate for use.

2.1.10.1. Alclad: When fabricated of aluminum, fabricate the items Alclad 3003, Alclad 3004, Alclad 3005, clad on both sides unless otherwise indicated.

a. Gutters, downspouts, and hangers

b. Gravel stops and fascias

c. Flashing

2.1.10.2. 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 0.8. to 1.3. mils, and color to match roof panels.

2.1.11. Aluminum Alloy, Extruded Bars, Rods, Shapes, and Tubes: ASTM B 221M

ASTM B 221.

2.1.12. Solder: ASTM B 32, 95-5 tin-antimony.

2.1.13. Polyvinyl Chloride Reglet: ASTM D 1784, Type II, Grade 1, Class 14333-D,

0.075 inch minimum thickness.

2.1.14. Bituminous Plastic Cement: ASTM D 4586, Type I.

2.1.15. Roofing Felt: ASTM D 226/D 226M Type I, or Type II, as approved.

2.1.16. Asphalt Primer: ASTM D 41.

2.1.17. 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: Not Used

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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

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 1793, 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 18 inches. Confine nailing of flashing to one edge only. Space nails evenly not over 3 inches on center and approximately 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 18 inches and over in width. Space cleats evenly not over 12 inch on center unless otherwise specified or indicated. Unless otherwise specified, provide cleats of 2 inches wide by 3 inches 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 nailheads. 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. Pretin 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 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.

3.1.6.1. Flat-lock Seams: Finish not less than 3/4 inch wide.

3.1.6.2. Lap Seams: Finish soldered seams not less than one inch wide. Overlap seams not soldered, not less than 3 inches.

3.1.6.3. Loose-Lock Expansion Seams: Not less than 3 inches wide; provide minimum one inch movement within the joint. Completely fill the joints with the specified sealant, applied at not less than 1/8 inch thick bed.

3.1.6.4. Standing Seams: Not less than one inch high, double locked without solder.

3.1.6.5. 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

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November 2011 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 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 0.040 inch. Aluminum 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 12 inches (maximum) on center. Where end lap fasteners are required to improve closure, locate the end lap fasteners not more than 2 inches from the end of the overlapping sheet.

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 32 foot intervals for aluminum and at not more than 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 12 feet apart.

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3.1.11. Base Flashing: For Shingled Roofs, 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. For Built-Up Roofs, extend up vertical surfaces of the flashing not less than 8 inches and not less than 4 inches 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 6 inches.

Overlap the flashing strips or shingles with the previously laid flashing not less than 3 inches. Fasten the strips or shingles 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 inches on center with approved fasteners, (large headed aluminum roofing nails, 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 4.5 inches at the lower side of dormer walls, chimneys, and similar vertical surfaces extending through the roof decks.

Install and fit the flashings so as to be completely 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 9 to 10 inches above roof decks, extend down vertical surfaces over upturned vertical leg of base flashings not less than 3 inches. Fold the exposed edges of counter flashings 1/2 inch. Where stepped counter flashings are required, they may be installed in short lengths a minimum 8 inches by 10 inches or may be of the preformed one-piece type. Provide end laps in counter flashings not less than 3 inches and make it weathertight with plastic cement. Do not make lengths of metal counter flashings exceed 10 feet. Form the flashings to the required shapes before installation. Factory-form the corners not less than 12 inches from the angle. Secure the flashings in the reglets with lead wedges and space not more than 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 counter flashings built into masonry or concrete walls not less than 1/4 inch and extend not less than 2 inches 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 1/4 inch and a depth of 1 1/4 inches, 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 18 inches, caulked full and solid with an approved compound.

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3.1.13.2. Friction Reglets: Provide with flashing receiving slots not less than 5/8 inch deep, one inch jointing tongues, and upper and lower anchoring flanges installed at 24 inches 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 inches 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: Polyvinyl Chloride (PVC) Reglets shall not be used.

3.1.15. Gravel Stops and Fascias: Prefabricate in the shapes and sizes indicated and in lengths not less than 8 feet. Extend flange at least 4 inches 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

1.5. inches long spaced not more than 3 inches on center, in two staggered rows.

3.1.15.1. Edge Strip: Hook the lower edge of fascias at least 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 6 inches maximum on center. Where fastening is made to concrete or masonry, use screws spaced 2 inches 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 1/16 inch thick compatible spacer or washers.

3.1.15.2. Joints: Leave open the section ends of gravel stops and fascias 1/4 inch and backed with a formed flashing plate, mechanically fastened in place and lapping each section end a minimum of 4 inches 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 fascia/eaves and rakes prior to the application of roofing shingles. Apply directly on the wood deck at the fascia/eaves and over the underlay along the rakes. Extend back from the edge of the deck not more than 3 inches and secure with compatible nails spaced not more than 10 inches on center along upper edge.

3.1.17. Gutters: The hung type of shape indicated and supported on underside by brackets that permit free thermal movement of the gutter. Provide gutters in sizes indicated complete with mitered corners, end caps, outlets, brackets, and other accessories necessary for installation. Bead with hemmed edge or reinforce the outer edge of gutter with a stiffening bar not less than 3/4 by 3/16 inch of material compatible with gutter. Fabricate gutters in sections not less than 8 feet. Lap the sections a minimum of one inch in the direction of flow or provide with concealed splice plate 6

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November 2011 inches minimum. Join the gutters, other than aluminum, by riveted and soldered joints.

Join aluminum gutters with riveted sealed joints. Provide expansion-type slip joints midway between outlets. Install gutters below slope line of the roof so that snow and ice can slide clear. Support gutters on adjustable hangers spaced not more than 30 inches on center. Adjust gutters to slope uniformly to outlets, with high points occurring midway between outlets. Fabricate hangers and fastenings from metals.

3.1.18. Downspouts: Space supports for downspouts according to the manufacturer's recommendation for the applicable substrate (wood, masonry, or steel). Types, shapes and sizes are indicated. Provide complete including elbows and offsets. Provide downspouts in approximately 10 foot lengths. Provide end joints to telescope not less than 1/2 inch and lock longitudinal joints. Provide gutter outlets with wire ball strainers for each outlet. Provide strainers to fit tightly into outlets and be of the same material used for gutters. Keep downspouts not less than one inch away from walls. Fasten to the walls at top, bottom, and at an intermediate point(s) not to exceed 5 feet on center with leader straps or concealed rack-and-pin type fasteners. Form straps and fasteners of metal compatible with the downspouts.

3.1.18.1. Terminations: Neatly fit into the drainage connection the downspouts terminating in drainage lines and fill the joints with a portland cement mortar cap sloped away from the downspout. Provide downspouts terminating in splash blocks with elbow-type fittings. Provide splash pans as specified.

3.1.19. Flashing for Roof Drains: Provide a 30 inches square sheet indicated. Taper insulation to drain from 24 inches out. Set flashing on finished felts in a full bed of asphalt roof cement, ASTM D 4586. Heavily coat the drain flashing ring with asphalt roof cement. Clamp the roof membrane, flashing sheet, and stripping felt in the drain clamping ring. Secure clamps so that felts and drain flashing are free of wrinkles and folds. Retrofit roof drains must conform to ANSI/SPRI RD-1.

3.1.20. Scuppers: Line interior of scupper openings with sheet metal. Extend the lining through and project outside of the wall to form a drip on the bottom edge and form to return not less than one inch against the face of the outside wall at the top and sides.

Fold outside edges under 1/2 inch on all sides. Provide the perimeter of the lining approximately 1/2 inch less than the perimeter of the scupper. Join the top and sides of the lining on the roof deck side to a closure flange by a locked and soldered joint. Join the bottom edge by a locked and soldered joint to the closure flange, where required, form with a ridge to act as a gravel stop around the scupper inlet. Provide surfaces to receive the scupper lining and coat with bituminous plastic cement.

3.1.21. Conductor Heads: Type indicated and fabricated of the same material as the downspouts. Set the depth of top opening equal to two-thirds of the width. Provide outlet tubes not less than 4 inches long. Flat-lock solder the seams. Where conductor heads are used in conjunction with scuppers, set the conductor a minimum of 2 inches wider than the scupper. Attach conductor heads to the wall with masonry fasteners, and loose-lock to provide conductor heads with screens of the same material. Securely fasten screens to the heads.

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3.1.22. Splash Pans: Install splash pans where downspouts discharge on roof surfaces and at other locations as indicated. Unless otherwise shown, provide pans not less than

24 inches long by 18 inches wide with metal ribs across the bottom of the pan. Form the sides of the pan with vertical baffles not less than one inch high in the front, and 4 inches high in the back doubled over and formed continuous with horizontal roof flanges not less than 4 inches wide. Bend the rear flange of the pan to contour of cant strip and extend up 6 inches under the side wall covering or to height of base flashing under counterflashing. Bed the pans and roof flanges in plastic bituminous cement and strip-flash as specified.

3.1.23. Open Valley Flashing: Provide valley flashing free of longitudinal seams, of width sufficient to extend not less than 6 inches under the roof covering on each side.

Provide a 1/2 inch fold on each side of the valley flashing. Lap the sheets not less than

6 inches in the direction of flow and secure to roofing construction with cleats attached to the fold on each side. Nail the tops of sheets to roof sheathing. Space the cleats not more than 12 inches on center. Provide exposed flashing not less than 4 inches in width at the top and increase one inch in width for each additional 8 feet in length. Where the slope of the valley is 4.5 inches or less per foot, or the intersecting roofs are on different slopes, provide an inverted V-joint, one inch high, along the centerline of the valley;

and extend the edge of the valley sheets 8 inches under the roof covering on each side.

Valley flashing for asphalt shingle roofs is specified in SECTION 07 31 13 ASPHALT

SHINGLES

3.1.24. Fascia/Eave Flashing: One piece in width, applied in 8 to 10 foot lengths with expansion joints spaced as specified in paragraph entitled "Expansion and Contraction."

Provide a 3/4 inch continuous fold in the upper edge of the sheet to engage cleats spaced not more than 10 inches on center. Locate the upper edge of flashing not less than 18 inches from the outside face of the building, measured along the roof slope.

Fold lower edge of the flashing over and loose-lock into a continuous edge strip on the fascia. Where fascia/eave flashing intersects metal valley flashing, secure with one inch flat locked joints with cleats that are 10 inches on center.

3.1.25. 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, 16 by 18 inches. 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.

3.1.26. Expansion Joints: Provide expansion joints for roofs, walls, and floors as specified or indicated. Provide expansion joints in continuous sheet metal at 40 foot intervals for copper and stainless steel and at 32 foot intervals for aluminum, Aluminum gravel stops and fascias which must have expansion joints at not more than 12 foot spacing. Provide evenly spaced joints. 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 spacing. Conform to the requirements of Table I.

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3.1.26.1. Roof Expansion Joints: Consist of curb with wood nailing members on each side of joint, bituminous base flashing, metal counterflashing, and metal joint cover. Bituminous base flashing is specified in Roofing Section. Provide counterflashing as specified in paragraph "Counterflashing," except as follows:

Provide counterflashing with vertical leg of suitable depth to enable forming into a horizontal continuous cleat. Secure the inner edge to the nailing member. Make the outer edge projection not less than one inch for flashing on one side of the expansion joint and be less than the width of the expansion joint plus one inch for flashing on the other side of the joint. Hook the expansion joint cover over the projecting outer edges of counterflashing. Provide roof joint with a joint cover of the width indicated. Hook and lock one edge of the joint cover over the shorter projecting flange of the continuous cleat, and the other edge hooked over and loose locked with the longer projecting flange. Joints are specified in Table II.

3.1.26.2. Floor and Wall Expansion Joints: Provide U-shape with extended flanges for expansion joints in concrete and masonry walls and in floor slabs.

3.1.27. 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.

3.1.28. Single Pipe Vents: See Table I, footnote (d). Set flange of sleeve in bituminous plastic cement and nail 3 inches on center. Bend the top of sleeve over and extend down into the vent pipe a minimum of 2 inches. 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 4 inches roof flange in bituminous plastic cement and nailed 3 inches on center. Extend sleeve a minimum of 8 inches above the roof deck and lapped a minimum of 3 inches 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.

3.1.29. Stepped Flashing: Stepped flashing shall be installed where sloping roofs surfaced with shingles abut vertical surfaces. Separate pieces of base flashing shall be placed in alternate shingle courses.

3.1.30. Copings: Provide coping using sheets 8 or 10 feet long joined by a 3/4 inch locked seam. Terminate outer edges in edge strips. Install with sealed lap joints, cover plate joints or standing seam joints, as indicated on drawings.

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.

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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.

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. SHEET METAL WEIGHTS, THICKNESSES, AND GAGES

Sheet Metal Items

Copper, (Ounces per

Square Foot)

Aluminum

(inch)

Stainless

Steel

(Inch)

Terne-

Coated Steel

(Inch)

Zinc-

Coated

Steel

(U.S. Std

Gage)

Building Expansion Joints, Cover 16 .032 .015 .015 24

Waterstop-bellows or flanged, U-type 16 -- .015 .015 --

Covering on minor flat pitched or curved surfaces 20 .040 .018 .018 --

Downspouts and leaders 16 .032 .015 .015 24

Downspout clips and anchors

.040 Clip

.125

Anchor

Downspout straps, 2-inch 48 (a) .060 .050 -- --

Conductor Heads 16 .032 .015 .015 --

Scupper lining 20 .032 .015 .015 --

Strainers, wire diameter or gage No. 9 .144 .109 --

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November 2011

Sheet Metal Items

Copper, (Ounces per

Square Foot)

Aluminum

(inch)

Stainless

Steel

(Inch)

Terne-

Coated Steel

(Inch)

Zinc-

Coated

Steel

(U.S. Std

Gage)

Base Flashing 20 .040 .018 .018 24

Cap Flashing or Counter

Flashing 16 .032 .015 .015 26

Eave Flashing 16 -- .015 .015 24

Spandrel Beam Flashing 10 -- .010 .010 --

Bond barrier Flashing 16 -- .015 .015 --

Stepped Flashing 16 .032 .015 .015 --

Valley Flashing 16 .032 .015 .015 --

Roof Drain Flashing 16 (b)

Pipe Vent Sleeve (d) flashing or Coping 16 -- -- -- --

Gravel Stops Flashing, Fascias or Extrusions -- .075 -- -- --

Sheets, Corrugated 16 .032 .015 .015 --

Sheets, Smooth 20 .050 .018 .018 24

Edge Strip Flashing 24 .050 .025 -- --

Gutters, Gutter Section 16 .032 .015 .015 24

Continuous cleat 16 .032 .015 .015 24

Gutter, Hangers, dimensions 1” x 1/8”

(a)

1” x .080”

(c)

1” x

.037”

Joint Cover Plates 16 .032 .015 .015 24

See Table II, Reglet (c) 10 -- .010 .010 --

See Table II, Splash Pans 16 .040 .018 .018 --

(a) – Brass

(b) – may be lead weighing 4 pounds per square foot

(c) – May be Polyvinyl chloride

(d) – 2.5 pound minimum lead sleeve with 4 inches flange. Where lead sleeve is impractical, refer to paragraph entitled “Single Pipe Vents” for optional material

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November 2011

TABLE II. SHEET METAL JOINT

TYPE OF JOINT

Item Designation

Copper, Terne-

Coated Steel, Zinc-

Coated Steel and

Stainless Steel

Aluminum Remarks

Joint cap for building expansion seam, cleated joint at roof

1.25 inch lock, standing seam, cleated

1.25 inch single lock, standing

Flashing, Base

One inch 3 inch lap for expansion joint

One inch flat locked, soldered; sealed; 3 inch lap for expansion joint

Aluminum producer’s recommended hard setting sealant for locked aluminum joints. Fill each metal expansion joint with a joint sealing compound

Flashing, Cap-in reglet 3 inch lap 3 inch lap

Seal groove with joint sealing compound.

Flashing, Reglet Butt joint --

Seal reglet groove with joint sealing compound

Flashing, Eave One inch flat locked, cleated.

One inch loose locked, expansion joint cleated

One inch flat locked, locked, cleated one inch loose locked, sealed expansion joints, cleated

Same as base flashing

Flashing, Stepped 3 inch lap 3 inch lap --

Flashing, Valley 6 inch lap cleated 6 inch lap cleated --

Flashing, Edge

Strip Butt Butt --

Flashing, Gravel

Stop

Extrusions

Butt with 1/2 inch space

Use sheet flashing beneath and a cover plate.

Sheet, smooth Butt with 1/4 inch space

Butt with 1/4 inch space Use sheet flashing backup plate.

Sheet, corrugated Butt with 1/4 inch space

Butt with 1/4 inch space

Use sheet flashing beneath and a cover plate or a combination unit

07 60 00 Flashing And Sheet Metal

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November 2011

Item Designation

Copper, Terne-

Coated Steel, Zinc-

Coated Steel and

Stainless Steel

Aluminum Remarks

Gutters

1.5 inch lap, riveted and soldered

One inch flat locked, riveted, and sealed

Aluminum producers recommended hard setting sealant for locked aluminum joints

(a) – Provide a 3 inch lap elastomeric flashing with manufacturer’s recommended sealant

(b) – Seal polyvinyl chloride reglet with manufacturer’s recommended sealant.

3.6 Additional Requirements:

3.6.1. Install flashings as detailed on the drawings and/or as recommended by the

BURS manufacturer. Modified bitumen fiber reinforced flashing sheets may be used if approved and installed per the BUR manufacturer’s instructions (torched, hot, cold applied, etc.).

3.6.1.1. Prime all surfaces to be flashed with asphalt primer and allow to dry.

3.6.1.2. Completely bond all flashings to the substrate, and the flashing plies to each other without voids. Coat all flashing substrate and ply interfaces with flashing cement to achieve a full and uniformly bonded laminate. Flashing cement shall be applied in a continuous layer. Use a straight edge trowel to apply flashing cement. Brushing application is not acceptable.

3.6.1.3. Follow additional applicable published requirements of the BURS manufacturer.

3.6.1.4. Tops of all membrane base flashings must be mechanically attached to the vertical substrate with large-headed nails, 6 to 9 inches on-center.

3.6.1.5. All side laps of membrane flashing surfacing sheets must be sealed with roofing cement reinforced with woven glass fiber mat (ASTM D 1668) 4 inches wide and centered over the lap.

3.6.1.6. Tops of all membrane base flashings must be sealed with roofing cement reinforced with 4-inch wide woven glass fiber mat (ASTM D 1668).

3.6.2. Roof Drain Flashing: Roof drain flashing shall be installed as shown on the drawings and in accordance with the BURS manufacturer’s recommendations.

3.6.3. Expansion Joint Covers. Install expansion joint covers as detailed and recommended by BURS manufacturer or Sheet Metal and Air Conditioning Contractors

National Association, Inc., (SMACNA), Architectural Sheet Metal Manual, Fourth

Edition (1987) or most current edition. Install end covers and splices in accordance with the manufacturer’s written instruction. Use only fasteners, adhesives, and other components as provided and as required or approved by the cover manufacturer.

-- End of Section –

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