07 60 00 - FLASHING AND SHEET METAL.pdf

Addendum #01 April 27, 2026 Columbus VAMC – Replace Roof Building 1A

#757-21-101

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FLASHING AND SHEET METAL

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SECTION 07 60 00

FLASHING AND SHEET METAL

PART 1 - GENERAL

1.1 DESCRIPTION

A. Formed sheet metal work for wall and roof flashing, roof edge metal, penetrations, drainage specialties are specified in this section.

1.2 RELATED WORK

A. Section 07 01 50.74 REHABILITATION OF EXISTING MEMBRANE ROOFING:

membrane rehabilitation system.

B. Section 07 52 16.11 COLD ADHESIVE STYRENE-BUTADIENE-STYRENE MODIFIED

BITUMINOUS MEMBRANE ROOFING Membrane base flashings and stripping.

C. Section 07 92 00, JOINT SEALANTS: Joint Sealants.

1.3 APPLICABLE PUBLICATIONS

A. Publications listed below form a part of this specification to the extent referenced. Publications are referenced in the text by the basic designation only. Editions of applicable publications current on date of issue of bidding documents apply unless otherwise indicated.

B. American National Standards Institute/Single-Ply Roofing

Institute/Factory Mutual (ANSI/SPRI/FM):

4435/ES-1-11............Wind Design Standard for Edge Systems Used with

Low Slope Roofing Systems

C. ASTM International (ASTM):

B32-08(2014)............Solder Metal

B209-14.................Aluminum and Aluminum-Alloy Sheet and Plate

D1784-20................Rigid Poly (Vinyl Chloride) (PVC) Compounds and

Chlorinated Poly (Vinyl Chloride) (CPVC)

Compounds

D. Sheet Metal and Air Conditioning Contractors National Association

(SMACNA): Architectural Sheet Metal Manual.

E. National Association of Architectural Metal Manufacturers (NAAMM):

AMP 500-06..............Metal Finishes Manual

F. Federal Specification (Fed. Spec):

A-A-1925A...............Shield, Expansion; (Nail Anchors)

UU-B-790A...............Building Paper, Vegetable Fiber

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G. International Code Commission (ICC): International Building Code, Current Edition

1.4 PERFORMANCE REQUIREMENTS

A. Wind Uplift Forces: Match existing in place sheet metal systems.

B. Wind Design Standard: Fabricate and install materials tested per

ANSI/SPRI/FM ES-1 to resist design pressure indicated on Drawings.

1.5 SUBMITTALS

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT

DATA, AND SAMPLES.

B. Shop Drawings: For all specified items, including:

1. Counterflashings

2. Roof edge metal

C. Certificates: Indicating compliance with specified finishing requirements, from applicator and contractor.

PART 2 - PRODUCTS

2.1 FLASHING AND SHEET METAL MATERIALS

A. Reuse existing sheet metal where possible.

B. Match existing sheet metal where replacement metal is needed.

C. Stainless Steel: ASTM A240, Type 304.

2.2 FLASHING ACCESSORIES

A. Solder: ASTM B32; flux type and alloy composition as required for use with metals to be soldered.

B. Fasteners:

1. Use stainless steel

C. Sealant: As specified in Section 07 92 00, JOINT SEALANTS for exterior locations.

2.3 SHEET METAL THICKNESS

A. Except as otherwise noted match existing thickness or provide new as noted below:

B. Exposed Locations:

1. Stainless steel: 24 gage, (0.024 inch).

2.4 FABRICATION, GENERAL

A. Jointing:

1. In general, stainless steel joints, except expansion and contraction joints, shall be locked and soldered.

2. Joints shall conform to following requirements:

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a. Lap joints subject to stress shall finish not less than 25 mm

(one inch) wide and shall be soldered and riveted.

b. Unsoldered lap joints shall finish not less than 100 mm (4 inches) wide.

3. Flat and lap joints shall be made in direction of flow.

4. Soldering:

a. Pre tin both mating surfaces with solder for a width not less than 38 mm (1 1/2 inches) of stainless steel.

b. Treat in accordance with metal producers recommendations other sheet metal required to be soldered.

B. Edge Strips or Continuous Cleats:

1. Fabricate continuous edge strips where shown and specified to secure loose edges of the sheet metal work.

2. Except as otherwise specified, fabricate edge strips or minimum 0.6 mm (0.024 inch) thick stainless steel.

3. Use material compatible with sheet metal to be secured by the edge strip.

4. Fabricate in 3000 mm (10 feet) maximum lengths with not less than 19 mm (3/4 inch) loose lock into metal secured by edge strip.

5. Fabricate Strips for fascia anchorage to extend below the supporting wood construction to form a drip and to allow the flashing to be hooked over the lower edge at least 19 mm (3/4-inch).

6. Fabricate anchor edge maximum width of 75 mm (3 inches) or of sufficient width to provide adequate bearing area to insure a rigid installation using 0.8 mm (0.031 inch) thick stainless steel.

2.5 FINISHES

A. Use same finish on adjacent metal or components and exposed metal surfaces unless specified or shown otherwise.

B. In accordance with NAAMM Metal Finishes Manual AMP 500, unless otherwise specified.

C. Finish exposed metal surfaces as follows, unless specified otherwise:

1. Stainless Steel: Finish No. 2B or 2D.

PART 3 - EXECUTION

3.1 INSTALLATION

A. General:

1. Install flashing and sheet metal items as shown in Sheet Metal and

Air Conditioning Contractors National Association, Inc., 01-01-21

FLASHING AND SHEET METAL

07 60 00 - 4 publication, ARCHITECTURAL SHEET METAL MANUAL, except as otherwise shown or specified.

2. Apply Sealant as specified in Section 07 92 00, JOINT SEALANTS.

3. Apply sheet metal and other flashing material to surfaces which are smooth, sound, clean, dry and free from defects that might affect the application.

4. Remove projections which would puncture the materials and fill holes and depressions with material compatible with the substrate. Cover holes or cracks in wood wider than 6 mm (1/4 inch) with sheet metal compatible with the roofing and flashing material used.

5. Confine direct nailing of sheet metal to strips 300 mm (12 inch) or less wide. Nail flashing along one edge only. Space nail not over

100 mm (4 inches) on center unless specified otherwise.

6. Install bolts, rivets, and screws where indicated, specified, or required in accordance with the SMACNA Sheet Metal Manual. Space rivets at 75 mm (3 inch) on centers in two rows in a staggered position. Use neoprene washers under fastener heads when fastener head is exposed.

7. Nail continuous cleats on 75 mm (3 inch) on centers in two rows in a staggered position.

8. Nail individual cleats with two nails and bend end tab over nail heads. Lock other end of cleat into hemmed edge.

9. Install flashings in conjunction with other trades so that flashings are inserted in other materials and joined together to provide a water tight installation.

3.2 DOOR SILL FLASHING:

1. Install flashing under bottom of plate sills of doors over curbs opening onto roofs. Extend flashing out to form counter flashing or receiver for counter flashing over base flashing. Set in sealant.

2. Extend sill flashing 200 mm (8 inch) beyond jamb opening. Turn ends up one inch in vertical masonry joint, extend end to face of wall.

Join to counter flashing for water tight joint.

3. Where doors thresholds cover over waterproof membranes install sill flashing over water proof membrane under thresholds. Extend beyond opening to cover exposed portion of waterproof membrane and not less than 150 mm (6 inch) beyond door jamb opening at ends. Turn up approximately 6 mm (1/4 inch) under threshold.

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3.3 COUNTERFLASHING

A. General:

1. Remove and reinstall existing counterflashing where present.

2. If new is needed fabricate and install counterflashing over and in conjunction with installation of base flashings, except as otherwise specified or shown.

3. Install counterflashing to lap base flashings not less than 100 mm

(4 inch).

4. Install upper edge or top of counterflashing not less than 225 mm (9 inch) above top of the roofing.

5. Lap joints not less than 100 mm (4 inch). Stagger joints with relation to metal base flashing joints.

6. Use surface applied counterflashing on existing surfaces and new work where not possible to integrate into item.

7. When fastening to concrete or masonry, use screws driven in expansion shields set in concrete or masonry. Use screws to wood and sheet metal. Set fasteners in mortar joints of masonry work.

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