076200_sheet_metal_flashing_and_trim_new_add2.pdf

General Services Administration Bid Set Phillip Burton FB Infrastructure Project 450 Golden Gate Ave., San Francisco, CA Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) SHEET METAL FLASHING AND TRIM

PROPERTY OF UNITED STATES GOVERNMENT 076200 - 1

FOR OFFICIAL USE ONLY ADDENDUM 02 – 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

SECTION 076200 – SHEET METAL FLASHING AND TRIM, Addendum 02

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. The Government is providing the references included in this sub-section for information purposes only and is not intended to provide a comprehensive, all-inclusive list of any and all potentially relevant portions of the Contract Documents. Drawings and general provisions of the Contract and other Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section includes the following sheet metal flashing and trim:

1. Fabricated sheet metal items including flashings as needed to provide a weathertight enclosure.

2. Reglets and accessories.

1.3. Parapet coping.

4. Pan flashings for windows, doors and louvers.

B. Related Requirements:

1.Section 074619 – Steel Siding.

1. Section 074616 – Aluminum Siding.

2. Section 079200 - Joint Sealants

1.3 REFERENCE STANDARDS

A. ASTM A 653/A 653M - Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process; 2013.

B. ASTM A 666 - Standard Specification for Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat Bar; 2010.

C. ASTM B 32 - Standard Specification for Solder Metal; 2008.

D.ASTM D 226/D 226M - Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing; 2009.

E.D. ASTM D 4586/D 4586M - Standard Specification for Asphalt Roof Cement, Asbestos-Free;

2007 (Reapproved 2012)e1.

F.E. SMACNA (ASMM) - Architectural Sheet Metal Manual; Sheet Metal and Air Conditioning Contractors' National Association; 2012.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) SHEET METAL FLASHING AND TRIM

PROPERTY OF UNITED STATES GOVERNMENT 076200 - 2

FOR OFFICIAL USE ONLY ADDENDUM 02 – 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

1.4 ADMINISTRATIVE REQUIREMENTS

A. Preinstallation Meeting: Conduct conference at Project Site and convene one week before starting work of this section.

1. Review construction schedule. Verify availability of materials, Installer's personnel, equipment, and facilities needed to make progress and avoid delays.

2. Review special roof details, roof drainage, roof-penetration flashing, equipment curbs, and condition of other construction that affect sheet metal flashing and trim.

3. Review requirements for insurance and certificates if applicable.

4. Review sheet metal flashing observation and repair procedures after flashing installation.

1.5 SUBMITTALS

A. Product Data: For each type of product indicated. Include construction details, material descriptions, dimensions of individual components and profiles, and finishes.

1. Manufacturer's information: Technical information including product data, installation instructions and general recommendations for each specified sheet material and fabricated product, and instructions for handling and storing material.

B. Shop Drawings: Show layouts of sheet metal flashing and trim. Distinguish between shop- and field-assembled work. Include the following:

1. Identify material, thickness, weight, and finish for each item and location in Project.

2. Details for forming sheet metal flashing and trim, including profiles, shapes, seams, and dimensions.

3. Details for fastening, joining, supporting, and anchoring sheet metal flashing and trim, including fasteners, clips, and attachments to adjoining work.

4. Include details of termination points and assemblies.

5. Include details of roof-penetration flashing.

6. Include details of edge conditions, including eaves, ridges, valleys, rakes, crickets, and counterflashings as applicable.

7. Include details of special conditions.

8. Include details of connections to adjoining work.

9. Do not submit Architectural Drawings. Submit fabricator’s shop drawings to confirm the actual profiles, shapes, seams, and dimensions of the sheet metal flashing and trim to be installed for the Project.

C. Samples for Verification: For each type of flashings and trims, prepared on Samples of size indicated below:

1. Sheet Metal Flashings: Minimum 12 inches long by actual width of unit, including finished seam and in required profile. Include fasteners, cleats, clips, closures, and other attachments.

2. Trim: Minimum 12 inches long. Include fasteners and other exposed accessories.

3. Accessories: Full-size Sample.

D. Submit Qualification Data of firms and persons specified in the “Quality Assurance” Article to demonstrate their capabilities and experience. Include lists of completed projects with project names and addresses, names and addresses of Architects and Owners, and other information.

E. Maintenance Data: For sheet metal flashing and trim, and its accessories, to include in maintenance manuals.

F. Warranty: Sample of special warranty.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) SHEET METAL FLASHING AND TRIM

PROPERTY OF UNITED STATES GOVERNMENT 076200 - 3

FOR OFFICIAL USE ONLY ADDENDUM 02 – 05/06/16

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G. Maintain one copy of each document on site.

1.6 QUALITY ASSURANCE

A. Sheet Metal Flashing and Trim Standard: Perform work in accordance with SMACNA Architectural Sheet Metal Manual requirements and standard details, except as otherwise indicated.

B. Fabricator/Installer Qualifications: A firm or individual experienced in fabricating and installing sheet metal flashing and trim systems similar in material and extent to those indicated for this Project, and whose work has resulted in applications with a record of successful in-service performance.

1. Company specializing in performing the work of this section with minimum three (3) years of experience.

2. Workers: Thoroughly skilled and specially trained in the techniques fabricating and installing sheet metal flashing and trim. Applicators Fabricators shall be able to demonstrate acceptable level of skill for review and acceptance by the Contracting Officer.

C. Use adequate numbers of skilled workmen thoroughly trained and experienced in the necessary crafts and completely familiar with the specified requirements and methods needed for proper performance of the Work of this Section.

D. All Work shall be subject to acceptance by the Government and Contracting Officer. All Work that does not comply with the intent of the specifications shall be corrected by the Contractor.

1.7 COORDINATION

A. Coordinate installation of sheet metal flashing and trim with interfacing and adjoining construction to provide a leakproof, secure, and noncorrosive installation.

B. Coordinate sheet metal flashing and trim layout and seams with sizes and locations of penetrations to be flashed, and joints and seams in adjacent materials.

1.8 DELIVERY, STORAGE, AND HANDLING

A. Stack materials on platforms or pallets, covered with suitable weathertight and ventilated covering. Slope metal sheets to ensure drainage.

B. Do not store sheet metal materials in contact with other materials that might cause staining, discoloration, denting, or other surface damage.

C. Deliver sheet metal flashing materials and fabrications undamaged. Protect sheet metal flashing and trim materials and fabrications during transportation and handling.

D. Unload, store, and install sheet metal flashing materials and fabrications in a manner to prevent bending, warping, twisting, and surface damage.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) SHEET METAL FLASHING AND TRIM

PROPERTY OF UNITED STATES GOVERNMENT 076200 - 4

FOR OFFICIAL USE ONLY ADDENDUM 02 – 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

E. Protect strippable protective covering on sheet metal flashing and trim from exposure to sunlight and high humidity, except to extent necessary for period of sheet metal flashing and trim installation.

F. Environmental requirements: Proceed with work of this section only when existing and forecasted weather conditions will permit the application to be performed in accordance with the manufacturer's recommendations.

G.Remove all materials, including cloths, tarps, and empty containers from the area of Work at the close of each day.

1.9 REGULATORY REQUIREMENTS

A. Conform to applicable federal, state, and local regulatory requirements including flame and smoke rating requirements for finishes.

B. Flammable Liquids serve all current regulation regarding flammable liquids such as posting “No Smoking” signs. Allow no open flames, welding, or other ignition sources in the Work.

C. Conform to all applicable laws, codes, and regulations for disposal of all materials, debris, and containers.

1.10 WARRANTY

A. General: Special warranty specified in this Article shall not deprive Government of other rights Government may have under other provisions of the Contract Documents and shall be in addition to, and run concurrent with, other warranties made by Contractor under requirements of the Contract Documents.

B. Special Fabricator’s/Installer's Warranty: Installer's standard form in which Fabricator/Installer agrees to repair or replace sheet metal products that do not comply with performance and other requirements specified in this Section within specified warranty period.

1. Warranty Period: Three (3) years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. General: Install sheet metal flashing and trim to withstand wind loads, structural movement, thermally induced movement, and exposure to weather without failing, rattling, leaking, and fastener disengagement.

B. Sheet Metal Standard for Flashing and Trim: Comply with NRCA's "The NRCA Roofing Manual and SMACNA's "Architectural Sheet Metal Manual" requirements for dimensions and profiles shown unless more stringent requirements are indicated.

C. SPRI Wind Design Standard: Manufacture and install roof edge flashings and copings tested in accordance with ANSI/SPRI/FM 4435/ES-1 RE-3 to positive and negative design wind pressure as defined by IBC.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) SHEET METAL FLASHING AND TRIM

PROPERTY OF UNITED STATES GOVERNMENT 076200 - 5

FOR OFFICIAL USE ONLY ADDENDUM 02 – 05/06/16

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C.D. Thermal Movements: Provide sheet metal flashing and trim that allow for thermal movements resulting from the following maximum change (range) in ambient and surface temperatures by preventing buckling, opening of joints, hole elongation, overstressing of components, failure of joint sealants, failure of connections, and other detrimental effects. Provide clips that resist rotation and avoid shear stress as a result of sheet metal thermal movements. Base engineering calculation on surface temperatures of materials due to both solar heat gain and nighttime-sky heat loss.

1. Temperature Change (Range): 120 deg F, ambient; 180 deg F, material surfaces

D.E. Water Infiltration: Provide sheet metal flashing and trim that do not allow water infiltration to building interior.

2.2 SHEET METALS

A. General: Protect mechanical and other finishes on exposed surfaces from damage by applying strippable, temporary protective film before shipping.

B. Sheet Metal Thickness: The following table may be used to convert specified sheet metal thickness to gauges. Not all materials will be used on the Project.

Gauge No.

Aluminum Stainless Steel

Zinc-Tin Coated

Stainless Steel

Galvanized Aluminum Zinc

Coated Steel

Zinc

12 0.081" --- --- --- --- 0.028" 13 0.072" --- --- --- --- 0.032" 14 0.064" --- --- --- --- 0.036" 15 0.057" --- --- --- --- 0.040" 16 0.050" 0.063" --- 0.064" 0.064" 0.045" 18 0.040" 0.050" --- 0.052" 0.052" 0.055" 20 0.032" 0.038" --- 0.040" 0.040" 0.070" 22 0.025" 0.031" --- 0.034" 0.034" 0.090" 24 0.020" 0.025" --- 0.028" 0.028" 0.125" 25 0.018" 0.022" 0.024" 0.025" 0.025" --- 26 0.017" 0.019" 0.018" 0.022" 0.022" ---

C. Galvanized steel: ASTM A653, with G90/Z275 zinc coating; minimum 0.034 0.022 inch thick base metal.

D. Stainless steel: ASTM A 666 Type 304, soft temper, minimum 0.019 0.025 inch thick; smooth No. 4 finish.

2.3 UNDERLAYMENT

A. Self-Adhering, High-Temperature Sheet Membrane (SAM): Minimum 30 mils thick, consisting of a slip-resistant polyethylene- or polypropylene-film top surface laminated to a layer of butyl or high SBS modified asphalt adhesive, with release-paper backing; specifically designed to withstand high metal temperatures beneath metal roofing. Provide primer according to written recommendations of underlayment manufacturer.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) SHEET METAL FLASHING AND TRIM

PROPERTY OF UNITED STATES GOVERNMENT 076200 - 6

FOR OFFICIAL USE ONLY ADDENDUM 02 – 05/06/16

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1. Products: Subject to compliance with requirements, provide the following:

a. W.R. Grace Construction Products; Ultra.

2.4 ACCESSORIES

A. General: Provide materials and types of fasteners, solder, protective coatings, sealants, and other miscellaneous items as required for complete sheet metal flashing and trim installation and as recommended by manufacturer of primary sheet metal unless otherwise indicated.

B. Fasteners: Wood screws, annular threaded nails, self-tapping screws, self-locking rivets and bolts, and other suitable fasteners designed to withstand design loads and recommended by manufacturer of primary sheet metal.

1. General: Blind fasteners or self-drilling screws, gasketed, with hex-washer head.

a. Exposed Fasteners: Stainless steel bolts and stainless steel and neoprene washers. Neoprene isolator at washer if stainless steel bolts contact with galvanized steel. Heads matching color of sheet metal using plastic caps or factory-applied coating.

b. Blind Fasteners: High-strength aluminum or stainless-steel rivets suitable for metal being fastened.

2. Fasteners for Stainless-Steel Sheet: Series 300 stainless steel.

3. Fasteners for zinc-coated (galvanized) Steel Sheet: Series 300 stainless steel.

C. Primer: Zinc chromate type.

D. Protective Backing Paint: Zinc molybdate alkyd.

E. Elastomeric Sealant: ASTM C 920, elastomeric polymer sealant; of type, grade, class, and use classifications required to seal joints in sheet metal flashing and trim and remain watertight.

Refer to Section 079200 Joint Sealants.

F. Plastic cement: ASTM D 4586, Type I.

G. Solder:

1. For zinc-coated (galvanized) steel: ASTM B 32; Grade Sn50 (50/50) type.

2. For stainless steel: ASTM B 32, Grade Sn60, with acid flux of type recommended by stainless-steel sheet manufacturer.

3. Neatly solder exposed surfaces.

4. Pre-tin edges minimum 1-1/2 inches both sides prior to soldering.

5. Solder metal joints. After soldering, remove flux. Wipe and wash solder joints clean.

2.5 MANUFACTURED SHEET METAL FLASHING AND TRIM

A. Reglets and counterflashings:

1. Manufacturers: Subject to compliance with requirements, provide products by the following:

a. Fry Reglet Corporation.

2. Reglets: Units of type, material, and profile required, formed to provide secure interlocking of separate reglet and counterflashing pieces, and compatible with flashing indicated. Provide factory-mitered and -welded corners and junctions and interlocking counterflashing on exterior face of same metal as reglet.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) SHEET METAL FLASHING AND TRIM

PROPERTY OF UNITED STATES GOVERNMENT 076200 - 7

FOR OFFICIAL USE ONLY ADDENDUM 02 – 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

a. Manufactured from the following materials:

1) Galvanized steel: 0.022 in. thick.

b. Concrete type: Provide temporary closure tape to keep reglet free of concrete materials, special fasteners for attaching reglet to concrete forms, and guides to ensure alignment of reglet section ends.

3. Counterflashings: Manufactured units of heights to overlap top edges of base flashings by 4 in. minimum and in lengths not exceeding 12 feet designed to snap into reglets and compress against base flashings with joints lapped.

a. Manufactured from the following materials:

1) Galvanized steel: 0.022 in. thick.

4. Accessories:

a. Flexible-flashing retainer: Provide resilient plastic or rubber accessory to secure flexible flashing in reglet where clearance does not permit use of standard metal counterflashing or where reglet is provided separate from metal counterflashing.

b. Counterflashing wind-restraint clips: Provide clips to be installed before counterflashing to prevent wind uplift of counterflashing lower edge.

2.52.6 FABRICATION

A. General: Custom fabricate sheet metal flashing to comply with recommendations in SMACNA's "Architectural Sheet Metal Manual" that apply to design, dimensions, geometry, metal thickness, and other characteristics of item indicated. Shop fabricate items where practicable.

1. Fabricate sheet metal flashing and trim in thickness or weight needed to comply with performance requirements, but not less than that specified for each application and metal.

2. Obtain field measurements for accurate fit before shop fabrication.

3. Form sheet metal flashing and trim to fit substrates without excessive oil canning, buckling, and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems.

4. Conceal fasteners and expansion provisions where possible. Do not use exposed fasteners on faces exposed to view.

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

C. Fabrication Tolerances: Fabricate sheet metal flashing and trim that is capable of installation to a tolerance of 1/4 inch in 20 feet on slope and location lines indicated on Drawings and within 1/8-inch offset of adjoining faces and of alignment of matching profiles.

D. Expansion Provisions: Where lapped or bayonet-type expansion provisions in the Work cannot be used, form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with elastomeric sealant concealed within joints.

1. Provide loose locking slip joint of maximum 8 feet from external and internal corners, maximum 24 feet length of straight runs, unless manufacturer recommends more frequent interval, and 1 at center of runs less than 20 feet, but more than 8 feet, unless specified otherwise following herein.

2. Size and locate joints, fastenings, reinforcements and supports as required to preclude distortion or displacement due to thermal expansion and contraction. Conceal fastenings wherever possible.

E. Sealed Joints: Form nonexpansion but movable joints in metal to accommodate elastomeric sealant to comply with SMACNA recommendations. Refer to Section 079200 “Joint Sealants”.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) SHEET METAL FLASHING AND TRIM

PROPERTY OF UNITED STATES GOVERNMENT 076200 - 8

FOR OFFICIAL USE ONLY ADDENDUM 02 – 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

F. Form pieces in longest possible lengths.

G. Fabricate cleats and attachment devices from same material as accessory being anchored or from compatible, noncorrosive metal.

H. Fabricate cleats and attachment devices of sizes as recommended by SMACNA's "Architectural Sheet Metal Manual" and by FMG Loss Prevention Data Sheet 1-49 for application, but not less than thickness of metal being secured.

I. Hem exposed edges on underside 1/2 inch; miter and seam corners. Raw edges will not be permitted

J. Seams: Form non-moving semas seams with flat lock seams, except where otherwise indicated. Form seams and seal with elastomeric sealant unless otherwise recommended by sealant manufacturer for intended use. Rivet joints where necessary for strength.

K. Fabricate corners from one piece with minimum 18 inch long legs; seam for rigidity, seal with sealant.

L. Fabricate vertical faces with bottom edge formed outward 1/4 in. and hemmed to form drip.

L.M. Metal Accessories: Provide sheet metal clips, straps, anchoring devices, and similar accessories as required for installation of work, matching or compatible with material installed, non-corrosive, size and gauge as required for performance.

M.N. Do not use graphite pencils to mark metal surfaces.

2.62.7 LOW-SLOPE ROOF SHEET METAL FABRICATIONS

A. Copings: Fabricate in minimum 96-inch long, but not exceeding 12-foot long, sections.

Fabricate joint splice plates of same thickness as copings. Furnish with continuous cleats to support edge of external leg and drill elongated holes for fasteners on interior leg. Miter corners, seal, and solder or weld watertight.

1. Fabricate from the following materials:

a. Stainless Steel: 0.025 inch thick.

b. Galvanized steel: 0.034 inch thick.

B. Roof to roof edge flashing transition: Shop fabricate interior and exterior corners.

1. Fabricate from the Following Materials:

a. Galvanized steel: 0.028 in. thick.

C. Roof penetration flashing:

1. Fabricate from the following materials:

a. Galvanized steel: 0.034 in. thick.

2.8 WALL SHEET METAL FABRICATIONS

A. Opening flashings in frame construction: Fabricate head, sill, and similar flashings to extend 4

in. beyond wall openings. Form head and sill flashing with 2-inch-high end dams. Fabricate from the following materials:

1. Galvanized steel: 0.034 in. thick.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) SHEET METAL FLASHING AND TRIM

PROPERTY OF UNITED STATES GOVERNMENT 076200 - 9

FOR OFFICIAL USE ONLY ADDENDUM 02 – 05/06/16

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PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates, areas, and conditions, with Installer present, for compliance with requirements for installation tolerances, substrate, and other conditions affecting performance of the Work.

1. Verify compliance with requirements for installation tolerances of substrates.

2. Verify that substrate is sound, dry, smooth, clean, sloped for drainage, and securely anchored.

3. Verify that air- or water-resistant barriers have been installed over sheathing or backing substrate to prevent air infiltration or water penetration.

4. Verify roof openings, curbs, pipes, sleeves, ducts, and vents through roof are solidly set, reglets in place, and nailing strips located.

5. Verify roofing termination and base flashings are in place, sealed, and secure.

B. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 PREPARATION

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

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

C.B. Back paint concealed metal surfaces with protective backing paint to a minimum dry film thickness of 15 mil.

3.3 UNDERLAYMENT INSTALLATION

A. General: Install underlayment as indicated on Drawings.

B. Self-Adhering Sheet Underlayment: Install self-adhering sheet underlayment, wrinkle free.

Prime substrate if recommended by underlayment manufacturer. Comply with temperature restrictions of underlayment manufacturer for installation; use primer for installing underlayment at low temperatures. Apply in shingle fashion to shed water, with end laps of not less than 6 inches staggered 24 inches between courses. Overlap side edges not less than 3-1/2 inches.

Roll laps and edges with roller. Cover underlayment within 14 days.

3.4 INSTALLATION, GENERAL

A. Comply with standards of SMACNA’s “Architectural Sheet Metal Manual” that apply to design, dimensions, metal, and other characteristics of item indicated.

B. General: Anchor sheet metal coping and other components of the Work securely in place, with provisions for thermal and structural movement. Use fasteners, solder, welding rods, protective coatings, separators, sealants, and other miscellaneous items as required to complete sheet metal flashing and trim system.

1. Install sheet metal flashing and trim true to line, levels, and slopes. Provide uniform, neat seams with minimum exposure of solder, welds, and sealant.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) SHEET METAL FLASHING AND TRIM

PROPERTY OF UNITED STATES GOVERNMENT 076200 - 10

FOR OFFICIAL USE ONLY ADDENDUM 02 – 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

2. Install sheet metal flashing and trim to fit substrates and to result in watertight performance. Verify shapes and dimensions of surfaces to be covered before fabricating sheet metal.

3. Space cleats not more than 12 inches apart. Attach each cleat with at least two fasteners. Bend tabs over fasteners.

4. Install exposed sheet metal flashing and trim with limited oil canning, and free of buckling and tool marks.

5. Torch cutting of sheet metal flashing and trim is not permitted.

6. Do not use graphite pencils to mark metal surfaces.

C. Metal Protection: Where dissimilar metals contact each other, or where metal contacts pressure-treated wood or other corrosive substrates, protect against galvanic action or corrosion by painting contact surfaces with bituminous coating or by other permanent separation as recommended by sheet metal manufacturer or cited sheet metal standard.

1.Coat concealed side of stainless-steel sheet metal flashing and trim with bituminous coating where flashing and trim contact wood, ferrous metal, or cementitious construction.

1. Underlayment: Where installing stainless steel sheet metal copings, install self-adhering, high-temperature sheet underlayment where coping comes into contract with wood, ferrous metal, or cementitious construction.

2. Underlayment: Where installing sheet metal flashing and trim directly on cementitious or wood substrates, install underlayment and cover with slip sheet or install a course of polyethylene self-adhering, high-temperature sheet underlayment.

D. Expansion Provisions: Provide for thermal expansion of exposed flashing and trim. Space movement joints at maximum of 10 feet with no joints within 24 inches of corner or intersection.

1. Form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with sealant concealed within joints.

2. Use lapped expansion joints only where indicated on Drawings.

E. Fasteners: Use fasteners of sizes that will penetrate substrate not less than 1-1/4 inches for nails and 3/4 inch for wood screws 1-1/4 inches for nails.

F. Conceal fasteners and expansion provisions where possible in exposed work and locate to minimize possibility of leakage. Cover and seal fasteners and anchors as required for a tight installation. Use exposed fasteners only where permitted.

G. Apply plastic cement compound between metal flashings and felt flashings.

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

H.I. Seal joints as required for watertight construction.

1. Use sealant-filled joints unless otherwise indicated. Embed hooked flanges of joint members not less than 1 inch into sealant. Form joints to completely conceal sealant.

When ambient temperature at time of installation is between 40 and 70 deg F, set joint members for 50 percent movement each way. Adjust setting proportionately for installation at higher ambient temperatures. Do not install sealant-type joints at temperatures below 40 deg F.

2. Prepare joints and apply sealants to comply with requirements in Section 079200 "Joint Sealants."

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) SHEET METAL FLASHING AND TRIM

PROPERTY OF UNITED STATES GOVERNMENT 076200 - 11

FOR OFFICIAL USE ONLY ADDENDUM 02 – 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

3.5 ROOF FLASHING INSTALLATION

A. General: Install sheet metal flashing and trim to comply with performance requirements, sheet metal manufacturer's written installation instructions, and SMACNA's "Architectural Sheet Metal Manual." Provide concealed fasteners where possible, set units true to line, and level as indicated. Install work with laps, joints, and seams that will be permanently watertight.

B. Copings: Anchor to resist uplift and outward forces according to recommendations in SMACNA's "Architectural Sheet Metal Manual" and as indicated.

1. Interlock exterior bottom edge of coping with continuous cleat anchored to substrate at

24-inch centers.

2. Anchor interior leg of coping with washers and screw fasteners through slotted holes at

24-inch centers.

C. Counterflashing: Coordinate installation of counterflashing with installation of base flashing.

Insert counterflashing in reglets or receivers and fit tightly to base flashing. Extend counterflashing 4 in. over base flashing. Lap counterflashing joints a minimum of 4 in. and bed with elastomeric sealant.

1. Secure in a waterproof manner by means of snap-in installation and sealant or lead wedges and sealant.

D. Recessed reglets:

1. Position recessed reglets securely in reglet joint utilizing lead wedges at 12 in. on center to keep reglet from moving within reglet joint. Hammer wedges to a depth that will not interfere with sealant or backer rod installation.

2. Lead wedges shall be sized to accommodate size of reglet joint.

3. Prime reglet and joint surfaces prior to installation of backer rod and sealant.

4. Install backer rod and sealant within reglet joint. Form sealant with fillet bead to minimize holding of water on reglet surface.

C.E. Roof-Penetration Flashing: Coordinate installation of roof-penetration flashing with installation of roofing and other items penetrating roof. Install flashing per roofing manufacturer's recommendations.

3.6 WALL FLASHING INSTALLATION

A. General: Install sheet metal wall flashing to intercept and exclude penetrating moisture according to SMACNA recommendations and as indicated. Coordinate installation of wall flashing with installation of wall-opening components such as windows, doors and louvers.

B. Openings Flashing in Frame Construction: Install continuous head, sill, and similar flashings to extend 4 in. beyond wall openings.

3.63.7 ERECTION TOLERANCES

A. Installation Tolerances: Shim and align sheet metal flashing and trim within installed tolerance of 1/4 inch in 20 feet on slope and location lines indicated on Drawings and within 1/8 inch offset of adjoining faces and of alignment of matching profiles

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) SHEET METAL FLASHING AND TRIM

PROPERTY OF UNITED STATES GOVERNMENT 076200 - 12

FOR OFFICIAL USE ONLY ADDENDUM 02 – 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

3.73.8 FIELD QUALITY CONTROL

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

3.83.9 CLEANING AND PROTECTION

A. Cleanup: At end of each workday, remove rubbish, empty cans, rags, and other discarded materials from Project site.

B. Legally dispose of debris in accordance with local, state, and federal regulations.

C. Clean exposed metal surfaces of substances that interfere with uniform oxidation and weathering.

D. Clean and neutralize flux materials. Clean off excess solder.

E. Clean off excess sealants.

B.F. Remove temporary protective coverings and strippable films as sheet metal flashing and trim are installed unless otherwise indicated in manufacturer's written installation instructions. On completion of sheet metal flashing and trim installation, remove unused materials and clean finished surfaces as recommended by sheet metal flashing and trim manufacturer. Maintain sheet metal flashing and trim in clean condition during construction.

C.G. Replace sheet metal flashing and trim that have been damaged or that have deteriorated beyond successful repair by finish touchup or similar minor repair procedures.

D.H. Protect work of other trades from damage whether being coated or not. Correct damage by cleaning, repairing, or replacing, and recoating as approved by Contracting Officer. Leave in an undamaged condition.

END OF SECTION 076200