07 60 00.pdf

REPAIR BUILDING 606, GENERAL INSTRUCTION BUILDING W912DS19C0034

USMA, WEST POINT, NY PN 94078

SECTION 07 60 00

FLASHING AND SHEET METAL

05/17, CHG 2: 11/18

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.

ASTM INTERNATIONAL (ASTM)

ASTM A480/A480M (2020a) Standard Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip

ASTM B32 (2020) Standard Specification for Solder Metal

ASTM B101 (2022) Standard Specification for Lead-Coated Copper Sheet and Strip for Building Construction

ASTM B209 (2014) Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate

ASTM B221 (2021) Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes

ASTM B370 (2022) Standard Specification for Copper Sheet and Strip for Building Construction

ASTM D41/D41M (2011; R 2016) Standard Specification for Asphalt Primer Used in Roofing, Dampproofing, and Waterproofing

ASTM D226/D226M (2017) Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing

ASTM D1784 (2020) Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds

ASTM D4586/D4586M (2007; E 2012; R 2012) Asphalt Roof Cement, Asbestos-Free

SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION

(SMACNA)

SMACNA 1793 (2012) Architectural Sheet Metal Manual, 7th Edition

SECTION 07 60 00 Page 1

SINGLE PLY ROOFING INDUSTRY (SPRI)

ANSI/SPRI RD-1 (2014) Performance Standard for Retrofit Drains

1.2 GENERAL REQUIREMENTS

Finished sheet metal assemblies must form a weathertight enclosure without waves, warps, buckles, fastening stresses or distortion, while allowing for expansion and contraction without damage to the system. The sheet metal installer is responsible for cutting, fitting, drilling, and other operations in connection with sheet metal modifications 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, uninterrupted roofing operations.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" or "S" classification. Submittals not having a "G" or "S" classification are for information only. When used, a code following the "G" classification identifies the office that will review the submittal for the Government.

Submit the following in accordance with Section 01 33 00 SUBMITTAL

PROCEDURES:

SD-02 Shop Drawings

Exposed Sheet Metal Coverings; G, AE

Gutters ; G, AE

Downspouts ; G, AE

Expansion Joints ; G, AE

Gravel Stops and fascia ; G, AE

Flashing for Roof Drains ; G, AE

Base Flashing ; G, AE

Counterflashing ; G, AE

Flashing at Roof Penetrations and Equipment Supports ; G, AE

Reglets ; G, AE

Scuppers ; G, AE

Copings ; G, AE

Conductor Heads ; G, AE

Roof Hatches and Accessories ; G, AE

SD-03 Product Data

Self-Adhering, High Temperature Modified Bitumen Underlayment ; G, SECTION 07 60 00 Page 2

AE

Roof Hatches and Accessories ; G, AE

Ballasted Gaurdrail ; G, AE

SD-04 Samples

Finish Samples ; G, AE

SD-08 Manufacturer's Instructions

Instructions for Installation

SD-10 Operation and Maintenance Data

Cleaning and Maintenance ; G, AE

1.4 MISCELLANEOUS REQUIREMENTS

1.4.1 Product Data

Indicate thicknesses, dimensions, fastenings, 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.

1.4.2 Finish Samples

Submit two color charts and two finish sample chips from manufacturer's standard color and finish options for each type of finish indicated.

1.4.3 Operation and Maintenance Data

Submit detailed instructions for installation and quality control during installation, cleaning and maintenance , for each type of assembly indicated.

1.5 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 installation.

PART 2 PRODUCTS

2.1 MATERIALS

Use any metal listed by SMACNA 1793 for a particular item, unless otherwise indicated. Provide materials, thicknesses, and configurations in accordance with SMACNA 1793 for each material. Different items need not be of the same metal, except thatcontact between dissimilar metals must be avoided.

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

SECTION 07 60 00 Page 3 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 fascia ;

cap, base, and 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

Provide in accordance with ASTM B370, cold-rolled temper, H 00 (standard).

2.1.4 Lead-Coated Copper Sheet

Provide in accordance with ASTM B101.

2.1.5 Stainless Steel

Provide in accordance with ASTM A480/A480M , Type 302 or 304, 2D Finish, fully annealed, dead-soft temper.

2.1.6 Aluminum Alloy Sheet and Plate

Provide in accordance with ASTM B209 form alloy, and temper appropriate for use. Provide material not less than 0.032-in in thickness.

2.1.7 Finishes

Provide exposed exterior sheet metal and aluminum with a baked on, factory applied color coating of polyvinylidene fluoride (PVF2) or approved equal fluorocarbon coating. Dry film thickness of coatings must be 0.8 to 1.3 mils . Color to be selected from manufacturer's full range of color choices or as indicated on the Drawings. Field applications of color coatings are prohibited and will be rejected.

2.1.8 Aluminum Alloy, Extruded Bars, Rods, Shapes, and Tubes

ASTM B221.

2.1.9 Solder

Provide in accordance with ASTM B32, 95-5 tin-antimony.

SECTION 07 60 00 Page 4

2.1.10 Reglets

2.1.10.1 Polyvinyl Chloride Reglets

Provide in accordance with ASTM D1784, Type II, Grade 1, Class 14333-D,

0.075 inch minimum thickness.

2.1.10.2 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 inch , as approved.

2.1.10.2.1 Caulked Reglets

Provide with rounded edges, temporary reinforcing cores, and accessories as required for securing to adjacent construction. Provide built-up mitered corner pieces for inside and outside corners.

2.1.10.2.2 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 inch maximum snap-lock type receiver.

2.1.11 Scuppers

Line interiors of scupper openings with sheet metal. Provide a drip edge at bottom edges with returns of not less than one inch against the face of the outside wall at the top and sides. Provide the perimeter of the lining approximately 1/2 inch less than the perimeter of the scupper.

2.1.12 Conductor Heads

Provide conductor heads and screens in the same material as downspouts.

Provide outlet tubes not less than 4 inches long.

2.1.13 Copings

Unless otherwise indicated, provide copings in pre-finished aluminum sheets, 8 or 10 feet long, joined by a 3/4 inch locked and soldered seam.

2.1.14 Bituminous Plastic Cement

Provide in accordance with ASTM D4586/D4586M , Type I.

2.1.15 Roofing Felt

Provide in accordance with ASTM D226/D226M Type I.

2.1.16 Self-adhering, High Temperature Modified Bitumen Underlayment

Self-Adhering, High-Temperature Sheet Underlayment: Minimum 30 mils (0.76

mm) thick, consisting of a slip-resistant polyethylene- or polypropylene-film top surface laminated to a layer of butyl- or SBS-modified asphalt adhesive, with release-paper backing; specifically designed to withstand high metal temperatures beneath metal roofing.

Provide primer in accordance with written recommendations of underlayment manufacturer.

SECTION 07 60 00 Page 5

a. Thermal Stability: ASTM D1970/D1970M; stable after testing at 240 deg F (116 deg C) or higher.

b. Low-Temperature Flexibility: ASTM D1970/D1970M; passes after testing at minus 20 deg F (29 deg C) or lower.

2.1.17 Slip Sheet

Rosin-sized building paper, 3 lb/100 sq. ft. (0.16 kg/sq. m) minimum.

2.1.18 Roofing Felt

Provide in accordance with ASTM D41/D41M.

2.1.19 Fasteners

Use the same metal as, or a metal compatible with the item fastened. Use stainless steel fasteners to fasten. Confirm compatibility of fasteners and items to be fastened to avoid galvanic corrosion due to dissimilar materials.

2.2 MANUFACTURED ITEMS

2.2.1 Roof Hatches and Accessories

Metal roof-hatch units with lids and insulated double-walled curbs, welded or mechanically fastened and sealed corner joints, continuous lid-to-curb counterflashing and weathertight perimeter gasketing integral metal cant, and integrally formed deck-mounting flange at perimeter bottom.

2.2.2 Type and Size

Single-leaf lid 36 by 36 inches (900 by 900 mm).

2.2.3 Loads

Minimum 40 lbf/sq. ft. (1.9 kPa) external live load and 20 lbf/sq. ft.

(0.95 kPa) internal uplift load.

2.2.4 Hatch Material, Steel

Thickness: Manufacturer's standard thickness for hatchsize indicated.

Finish: Baked enamel or powder coat. Color as selected.

2.2.5 Construction

a. Insulation 2-inch (50 mm) thick, polyisocyanurate board. R-value:

12.0 minimum.

b. Nailer: Factory-installed wood nailer continuous around hatch perimeter.

c. Hatch Lid: Opaque insulated, and double walled, with manufacturer's standard metal liner of same material and finish as outer metal lid.

d. Curb Liner: manufacturer's standard, of same material and finish as metal curb.

SECTION 07 60 00 Page 6

e. Fabricate curbs to minimum height of 12 inches (305 mm) above roofing surface unless otherwise indicated.

2.2.6 Hardware:

Spring-operators, hold-open arm, galvanized steel spring latch with turn handles, galvanized steel-butt or pintle-type hinge system, and padlock hasps inside and outside.

2.2.7 Roof-Hatch Railing System :

Roof-hatch manufacturer's standard system including rails, clamps fasteners, safety barrier at railing opening, and accessories required for a complete installation; attached to roof hatch and complying with 29 CFR

1910.23 requirements and authorities having jurisdiction.

a. Height: 42 inches (1060 mm) above finished roof deck.

b. Posts and Rails: Galvanized-steel pipe, 1-1/4 inches in diameter or galvanized-steel tube, 1-5/8 inches in diameter.

c. Maximum Opening Size: System constructed to prevent passage of a sphere 21 inches in diameter.

d. Self-latching Gate: Fabricated of same materials and rail spacing as safety railing system. Provide manufacturer's standard hinges and self-latching mechanism.

e. Post and Rail Tops and Ends: Weather resistant, closed or plugged with prefabricated end fittings.

f. Provide weep holes or another means to drain entrapped water in hollow sections of handrail and railings members

g. Fabricate joints exposed to weather to be watertight.

h. Fasteners: Manufacturer's standard, finished to match railing system.

i. Finish: Manufacturer's standard. Color: Safety yellow.

2.2.8 Ballasted Safety Rail System

Provide Ballasted Guradrail with heavy weighted bases to ensure stability and in compliance with OSHA standard CFR 29 1910.29 for Guardrail Systems.

a. uprights: ASTM C1008/1010 steel tube, 1.625 dia x 0.065 inches.

Length: 22 inches

b. Bases: Class 35 gray iron; galvanized. 23 x 23 inches.

c. Hardware: 3/8-16 thread x 1 inch long zinc plated steel. Bases: Class 35 gray iron; galvanized. 23 x 23 inches.

d. Toe Boards: Aluminum. 2 x 4 inches. Thickness: 0.125 inch.

e. Uprights:

1) Top Rail: 42 inches.

SECTION 07 60 00 Page 7

2) Mid Rail: 21 inches.

f. Weight:

1) Base: +/- 99.6 lbs.

2) Post: +/- 5 lbs

3) Horizontal Rails: +/- 1lb. / lineal foot.

g. Type 316 hot-dipped galvanized steel as indicated in accordance with ASTM A123/A123M. Touch up abraded surfaces anc cut ends of galvanized members with zinc-dust, zinc-oxide primer, or an approved galvanizing repair compound.

2.2.9 Ladder-Assist Post

Roofing-hatch manufacturer's stand device for attachment to roof-access ladder.

a. Operation: Post locks in place on full extension; release mechanism returns post to closed position.

b. Height: 42 inches above finished roof deck.

c. Material: Steel tube.

d. Post: 1-5/8 inch diameter pipe.

e. Finish: Manufacturer's standard baked enamel or powder coat. Color:

Safety yellow.

2.3 FLASHING

2.3.1 Roof-to-Wall Transition Counterflashing

Shop fabricate interior and exterior corners. Fabricate from the following material:

a. Aluminum: 0.032 inch (0.81 mm) thick, unless otherwise indicated on drawings.

b. Profile: Provide drip edge or flashing receiver edge as indicated in Drawings.

c. Painted Finish: Color as selected by Architect.

2.3.2 Wall Flashing at Curtainwall Jambs, Heads and Sills

Fabricate flashing as indicated with concealed leg extending 4 inches (100

mm) behind curtainwall frame. Dam back side and ends at sill locations.

Conceal end dams behind jamb flashing/trim. Hem exposed edge of flashing.

Fabricate from the following material:

a. Prefinished Aluminum: 0.032 inch (0.81 mm) thick.

b. Color to match adjacent curtain wall system color.

SECTION 07 60 00 Page 8

2.3.3 Metal Copings

a. Prefinished Aluminum: 0.050 inch (1.27 mm) thick.

b. Color as selected by Architect.

2.3.4 Metal Fascias

a. Prefinished Aluminum: 0.040 inch (1.01 mm) thick.

b. Color as selected by Architect.

2.3.5 Stone Coping

a. Lead-Coated Copper (ASTM B101)

2.3.6 Insulated Metal Panel (IMP) Base Trim :

a. Prefinished Aluminum: 0.050 inch (1.27 mm) thick.

b. Color to match IMP.

2.3.7 Metal Composite Material (MCM) Clips

a. Prefinished Aluminum: 0.032 inch (0.81 mm) thick.

b. Color to match MCM.

2.3.8 Embedded Through-Wall Flashing

Provided under Section 04 20 00 "Unit Masonry".

2.3.9 Fabricated Metal Wall Panels Base Trim

1. Prefinished Aluminum: 0.050 Inch (1.27 mm) thick.

2. Color: Match formed metal wall panels.

PART 3 EXECUTION

3.1 INSTALLATION

3.1.1 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.

SECTION 07 60 00 Page 9

3.1.2 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 inch 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.

3.1.3 Cleats

Provide cleats for sheet metal 18 inches and over in width. Space cleats evenly not over 12 inches 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. Pre-tin cleats for soldered seams.

3.1.4 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 inches or less in thickness.

3.1.5 Seams

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

3.1.5.1 Flat-lock Seams

Finish not less than 3/4 inch wide.

3.1.5.2 Lap Seams

Finish soldered seams not less than one inch wide. Overlap seams not soldered, not less than 3 inches .

3.1.5.3 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.

3.1.5.4 Standing Seams

Not less than one inch high, double locked without solder.

3.1.5.5 Flat Seams

Make seams in the direction of the flow.

SECTION 07 60 00 Page 10

3.1.6 Soldering

Where soldering is specified, apply to copper, terne-coated stainless steel, zinc-coated steel, and stainless steel items. Pre-tin 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.

3.1.6.1 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 pre-tinned. Seal the joints in aluminum sheets of 0.040 inch or less in thickness with specified sealants. Do not solder aluminum.

3.1.7 Mechanical Fastening

Aluminum 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.

3.1.7.1 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.

3.1.8 Protection from Contact with Dissimilar Materials

3.1.8.1 Copper or Copper-bearing Alloys

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

3.1.8.2 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.

Aluminum may be used over concrete construction, provided that required reglets are of stainless steel and aluminum surface in contact with concrete or masonry is coated with bituminous paint or zinc chromate primer.

3.1.8.3 Metal Surfaces

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

SECTION 07 60 00 Page 11

3.1.8.4 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.

3.1.8.5 Underlayment Installation

Install underlayment according to roof panel manufacturer's written recommendations and recommendation in NRCA "The NRCA Roofing and Waterproofing Manual".

a. Install self-adhering sheet underlayment; wrinkle free on roof deck.

Comply with low-temperature installation restrictions of manufacturer where applicable. Install at locations indicated on project drawings, lapped in a direction to shed water. Lap sides not less than 3-1/2 inches. Lap ends not less than 6 inches staggered 24 inches between courses. Roll laps with roller. Cover underlayment within seven days.

b. Apply slip sheet at time of roof panel installation when other underlayment is used that may be in direct contact with the adhere to or adversely impact the underside of roof panels, and as otherwise recommended by the roof panel manufacturer.

3.1.9 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 fascia by expansion and contraction joints spaced not more than 12 feet apart.

3.1.10 Base Flashing

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 with the previously laid flashing not less than 3 inches . 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 inches 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 4.5 inches 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 weathertight. Provide factory-fabricated base flashing for interior and exterior corners. Do not use metal base flashing on built-up roofing.

3.1.11 Counterflashing

Except where indicated or specified otherwise, insert counterflashing in reglets located from 9 to 10 inches above roof decks, extend down vertical

SECTION 07 60 00 Page 12 surfaces over upturned vertical leg of base flashings not less than 3 inches . Fold the exposed edges of counterflashings 1/2 inch . Where stepped counterflashings are required, they may be installed in short lengths a minimum 8 inches by 8 inches or may be of the preformed single piece type. Provide end laps in counterflashings not less than 3 inches and make it weathertight with plastic cement. Do not make lengths of metal counterflashings exceed 10 feet . Form flashings to the required shapes before installation. Factory form corners not less than 12 inches from the angle. Secure the flashings in the reglets with lead wedges and space not more than 16 inches apart . 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 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.

3.1.12 Metal Reglets

Keep temporary cores in place during installation. Ensure factory fabricated caulked type or friction type, reglets have a minimum opening of 1/4 inch and a minimum depth of 1-1/4 inch , when installed.

3.1.12.1 Caulked Reglets

Wedge flashing in reglets with lead wedges every 18 inches , caulked full and solid with an approved compound.

3.1.12.2 Friction Reglets

Install flashing snap lock receivers at 24 inches on center maximum. When flashing has been inserted the full depth of the slot, caulk the slot, lock with wedges, and fill with sealant.

3.1.13 Fascia

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 fascia after all plies of the roofing membrane have been applied, but before the flood coat of bitumen is applied. Prime roof flange of fascia 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 inch long spaced not more than 3 inches on center, in two staggered rows.

3.1.13.1 Edge Strip

Hook the lower edge of fascia 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 12 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.

SECTION 07 60 00 Page 13

3.1.13.2 Joints

Leave open the section ends of gravel stops and fascia 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 fascia in accordance with the manufacturer's printed instructions and details.

3.1.14 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 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 with continuous cleats along roof side of gutter . Adjust gutters to slope uniformly to outlets, with high points occurring midway between outlets.

Fabricate hangers and fastenings from compatible metals.

3.1.15 Downspouts

Space supports for downspouts according to the manufacturer's recommendation for the substrate. 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 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.

3.1.15.1 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.

3.1.16 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 D4586/D4586M . 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 .

SECTION 07 60 00 Page 14

3.1.17 Scuppers

Extend the scupper liner through and project outside of, the wall it penetrates to form a bottom drip edge against the face of the wall. Fold outside edges under 1/2 inch on all sides. 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.

3.1.18 Conductor Heads

Set the depth of the top opening equal to two-thirds of the width or the conductor head. Flat-lock solder 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. Securely fasten screens to heads.

3.1.19 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.

3.1.20 Expansion Joints

Provide expansion joints for roofs, walls, and floors as indicated.

Provide expansion joints in continuous sheet metal at 40 foot intervals for copper and stainless steel and at 32 foot intervals for aluminum . A luminum gravel stops and fascia 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.

3.1.20.1 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 detailed on Drawings and 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.

SECTION 07 60 00 Page 15

3.1.21 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.

3.1.22 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.

3.1.23 Roof Hatch

Instll hatch level at opening location. Butt specified roof insulation tight to hatch perimeter. Securely anchor to deck to support load.

Anchor safety rail system and ladder assist post securely in place as directed by manufacturer. Adjust hatch lide and gate to swing freely and securely latch when closed. Adjust ladder up post to raise and lower smoothly and securely lock in place.

3.1.24 Copings

Provide coping with locked and soldered seam. Terminate outer edges in edge strips. Install with sealed cover plate joints as indicated.

3.2 PAINTING

Touch ups in the field may be applied only after metal substrates have been cleaned and pretreated in accordance with manufacturer's written instructions and products.

Field-paint sheet metal for separation of dissimilar materials.

3.2.1 Aluminum Surfaces

Clean with solvent and apply 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

SECTION 07 60 00 Page 16 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 kilograms per square meter

Aluminum, mm Stainless Steel, mm

Zinc-Coated Steel, mm

Downspouts and leaders 4.9 0.81 0.38 0.6

Downspout clips and anchors

- 1.02 clip

3.175 anchor

Downspout straps, 50 mm 14.7 (a) 1.52 1.27 -

Conductor heads 4.9 0.81 0.38 -

Scupper lining 6.125 0.81 0.38 -

Strainers, wire diameter or gage

4.0 gage 3.66 diameter 2.77 diameter

Flashings:

Base 6.125 1.02 0.46 0.6

SECTION 07 60 00 Page 17

TABLE I. SHEET METAL WEIGHTS, THICKNESSES, AND GAGES

Sheet Metal Items Copper kilograms per square meter

Aluminum, mm Stainless Steel, mm

Zinc-Coated Steel, mm

Cap (Counter-flashing) 4.9 0.81 0.38 0.5

Bond barrier 4.9 - 0.38 -

Roof drain 4.9 (b)

Pipe vent sleave (d)

Coping 4.9 - - -

Gravel stops and fascia:

Extrusions - 1.91 - -

Sheets, corrugated 4.9 0.81 0.38 -

Sheets, smooth 6.125 1.27 0.46 0.6

Edge strip 7.35 1.27 0.635 -

Gutters:

Gutter section 4.9 0.81 0.38 0.6

Continuous cleat 4.9 0.81 0.38 0.6

Hangers, dimensions 25 mm by 3 mm (a)

25 mm by 2 mm (c)

25 mm by 1 mm -

Joint Cover plates (See Table II)

4.9 0.81 0.38 0.6

Reglets (c) 3.1 - 0.25 -

(a) Brass.

(b) May be lead weighing 19.6 kilograms per square meter.

(c) May be polyvinyl chloride.

SECTION 07 60 00 Page 18

TABLE I. SHEET METAL WEIGHTS, THICKNESSES, AND GAGES

Sheet Metal Items Copper kilograms per square meter

Aluminum, mm Stainless Steel, mm

Zinc-Coated Steel, mm

(d) 12.25 kilogram minimum lead sleeve with 100 mm flange. Where lead sleeve is impractical, refer to paragraph SINGLE PIPE VENTS for optional material.

TABLE II. SHEET METAL JOINTS

TYPE OF JOINT

Item Designation Copper, and Stainless Steel

Aluminum Remarks

Joint cap for building expansion seam, cleated joint at roof

1.25 inch single lock, standing seam, cleated

1.25 inch single lock, standing

Flashings

Base One inch 3 inch lap for expansion joint

One inch flat locked, soldered;

sealed; 3 inch lap for expansion joint

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

SECTION 07 60 00 Page 19

TABLE II. SHEET METAL JOINTS

TYPE OF JOINT

Item Designation Copper, and Stainless Steel

Aluminum Remarks

Cap-in reglet 3 inch lap 3 inch lap Seal groove with joint sealing compound.

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

Eave One inch flat locked, cleated. One inch loose locked, sealed expansion joint, cleated.

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

Same as base flashing.

Stepped 3 inch lap 3 inch lap --

Valley 6 inch lap cleated 6 inch lap cleated --

Edge strip Butt Butt --

Gravel stops:

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

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.

SECTION 07 60 00 Page 20

TABLE II. SHEET METAL JOINTS

TYPE OF JOINT

Item Designation Copper, and Stainless Steel

Aluminum Remarks

(b) Seal Polyvinyl chloride reglet with manufacturer's recommended sealant.

-- End of Section --

SECTION 07 60 00 Page 21