Attachment 3. Project Specification Sections 074113.16 & 07620.pdf

USDA FOREST SERVICE PROJECT SPECIFICATIONS 01/20

METAL ROOF PANELS, STANDING SEAM 074113.16 - 1

SECTION 074113.16 - METAL ROOF PANELS, STANDING SEAM

PART 1 - GENERAL

1.1 SECTION REQUIREMENTS

A. Summary: Factory-formed snap lock standing seam metal roof panels installed over a plywood roof deck with related metal fascia, trim, and accessories.

B. Submittals: Product Data, Sustainable Design, Shop Drawings, and Color Samples.

C. Warranties:

1. Weathertightness: Manufacturer's standard written warranty, signed by manufacturer in which

Manufacturer and Installer jointly agree to promptly repair or replace metal panel assemblies furnished by manufacturer that fail to remain weathertight, including leaks, for the period of 20 years.

2. Panel Finish: On Manufacturer’s standard form, in which Manufacturer agrees to repair or replace metal roof panels that evidence deterioration of factory-applied finish under normal atmospheric conditions, including:

a. Fluoropolymer Paint System:

1) Color fading exceeding 5 Hunter units per ASTM D 2244.

2) Chalking exceeding No. 8 rating per ASTM D 4214.

3) Failure of adhesion, peeling, checking, or cracking.

4) Finish Warranty Period, Paint Finish: 20-Years from date of installation.

1.2 QUALITY ASSURANCE

A. Manufacturer Qualifications: Approved manufacturer with minimum five years' experience in manufacture of similar products in successful use in similar applications.

B. Installer Qualifications: Experienced Installer certified by metal roof panel manufacturer with minimum of five years’ experience with successfully completed projects of a similar nature and scope.

1.3 SUBMITTALS

A. Product Data: Manufacturer’s data sheets for specified products.

1. Include data indicating compliance with performance requirements.

B. Sustainable Design:

1. Product Test Reports: For roof materials, documentation indicating that roof materials comply with Solar Reflectance Index requirements.

2. Product Data: For recycled content, indicating postconsumer and pre-consumer recycled content.

C. Shop Drawings:

1. Show layout of metal roof panels. Include details of each condition of installation, panel profiles, and attachment to building.

2. Provide details of edge conditions, joints, fastener and sealant placement, flashings, openings, penetrations, roof accessories, and special details.

METAL ROOF PANELS, STANDING SEAM 074113.16 - 2

D. Color Samples for Initial Selection: For each exposed product specified. Provide representative color charts of manufacturer's full range of colors.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. General: Provide metal roof panel system meeting performance requirements as determined by application of specified tests by a qualified testing facility on manufacturer's standard assemblies.

B. Manufacturer/Source: Provide metal roof panel assembly and exposed sheet metal accessories from a single manufacturer meeting quality assurance requirement of this Section.

C. Energy Performance of Roof Panels: Three-year, aged, solar reflectance not less than 0.55 and emissivity not less than 0.75, or aged, Solar Reflectance Index of not less than 64.

D. Solar Reflectance Index (SRI) for Roof Slope Greater than 2:12: Three-year aged SRI minimum 32 or initial SRI minimum 39, per ASTM E 1980.

E. Energy Star Qualified: Listed on US DoE ENERGY STAR Roof Products Qualified Product List.

F. Roofing System Design: Provide roofing system that is identical to systems that have been successfully tested by a qualified testing and inspecting agency in accordance with UL 580, or UL 1897, and to resist uplift pressures.

1. Wind-Uplift Resistance of Roof Assemblies: UL 580, Class 90.

2. Wind Loads: Determine loads based on uniform pressure, importance factor, exposure category, and basic wind speed per ASCE-7.

G. Hail Resistance: Provide metal roof panel assemblies listed as Class 4 hail resistant and tested in accordance with UL 2218.

H. Air Infiltration, ASTM E 1680: Maximum 0.03 cfm/sq. ft. at static-air-pressure difference of 1.57 psf.

I. Water Penetration Static Pressure, ASTM E 1646: No uncontrolled water penetration at a static pressure of 12 psf.

J. Fire Resistance: Class A Fire Rating in accordance with UL 790.

K. Thermal Movements: Allow for thermal movements from variations in both ambient and internal temperatures. Accommodate movement of support structure caused by thermal expansion and contraction. Allow for deflection and design for thermal stresses caused by temperature differences from one side of the panel to the other.

2.2 METAL ROOF PANELS

A. Snap Lock, Concealed Fastener, Standing Seam Metal (Galvalume) Roof Panels: Metal roof panel consisting of formed metal sheet with standing ribs at panel edges, installed by lapping and interconnecting edges of adjacent panels, and attaching panels to supports using concealed clips and fasteners in a weathertight installation.

1. Standing seam height: 1.5 inch (38.1 mm).

a. 24 gage commercial grade steel.

2. Panel Width: 15 inches.

METAL ROOF PANELS, STANDING SEAM 074113.16 - 3

3. Pan Configuration: Striated.

4. Joint Type: Snap Lock.

B. Aluminum-Zinc Alloy-Coated Steel Sheet: ASTM A 792/A 792M, structural quality, Grade 50, pre-painted by the coil-coating process per ASTM A 755/A 755M.

1. Minimum Thickness: 0.0236 inch/24 gage (0.59 mm) coated thickness.

2. Metal Panel Surface: Smooth.

3. Exterior Finish: Manufacturer's standard two-coat fluoropolymer system with color coat containing not less than 70 percent polyvinylidene fluoride (PVDF) resin by weight.

4. Color: As selected by Contracting Officer from manufacturer's full range of standard colors.

2.3 METAL PANEL ACCESSORIES

A. Panel Clips for Steel Sheets: Manufacturer's standard one-piece galvanized steel clip, ASTM A 653/A 653M, G90 (Z180) hot-dip galvanized zinc coating, 20 gauge, measuring 1.610” height x 2.010” width x 2.000” length.

B. Panel Fasteners: Self-tapping screws and other acceptable corrosion-resistant fasteners recommended by metal roof panel manufacturer for specified application. Where exposed fasteners cannot be avoided, supply fasteners with EPDM or neoprene gaskets, and heads matching color of metal panels by means of factory-applied coating.

C. Joint Sealers: Manufacturer's standard or recommended liquid and preformed sealers and tapes, and as follows:

1. Tape Sealers: Manufacturer's standard non-curing butyl tape, AAMA 809.2.

2. Concealed Joint Sealant: Non-curing butyl, AAMA 809.2.

2.4 ROOF SYSTEM ACCESSORIES

A. Formed Metal Accessories: Provide complete metal roof assembly incorporating trim, copings, fascia, and miscellaneous flashings as required for Project, in metal roof panel manufacturer's recommended profiles. Provide required clips, fasteners, closure strips, support plates, seam covers, gaskets, fillers, sealants, and similar items.

1. Match material, thickness, and finish of metal panels.

B. Flashing and Trim: Provide flashing and trim as required to seal against weather and to provide finished appearance. Finish flashing and trim with same finish system as adjacent metal roof panels.

C. Felt Underlayment: ASTM D 226, Type II (No. 30), asphalt-saturated organic felts.

D. Ice Dam Underlayment: Self-Adhering, High-Temperature Multilayer Laminated Underlayment Sheet:

ICC-ES AC188 compliant high tensile strength sheet, minimum 25 mils (0.63 mm) thick minimum, consisting of polypropylene membrane with a slip-resisting top surface suitable for contact with metal roofing, and adhesive layer with release-paper backing.

1. UV Exposure Rating: 12 months.

2. Tensile Strength, ASTM D 226: 106 lbf/in (30.4 kN/m), cross-machine direction.

3. Self-Sealability, ASTM D 1970: Pass.

4. Flame Spread, ASTM E 84: Class A.

E. Slip Sheet: Manufacturer's recommended slip sheet, of type required for application.

METAL ROOF PANELS, STANDING SEAM 074113.16 - 4

2.5 FABRICATION

A. General: Provide fabricated and finished metal panels and metal panel accessories meeting performance requirements, indicated profiles, finishes, and structural requirements.

B. On-Site Fabrication: Fabricate metal panels on-site using manufacturer-approved portable roll-forming equipment. Fabricate according to equipment manufacturer's written instructions and to comply with manufacturer's details.

C. Form panels in continuous lengths for full length of detailed runs, except where otherwise indicated on approved shop drawings.

D. Sheet Metal Flashing and Trim: Fabricate flashing and trim to comply with roof panel manufacturer's recommended profiles, approved shop drawings, and Project drawings. Form from materials matching metal panel substrate and finish.

2.6 FINISHES

A. Finishes, General: Prepare, pretreat, and apply coating to exposed metal surfaces to comply with coating and resin manufacturers' written instructions.

B. Steel Panels and Accessories:

1. Fluoropolymer Two-Coat System: 0.2 – 0.3 mil primer with 0.7 - 0.8 mil 70 percent PVDF fluoropolymer color coat, AAMA 621.

2. Interior Finish: 0.5 mil total dry film thickness consisting of primer coat and wash coat of manufacturer's standard light-colored acrylic or polyester backer finish.

2.7 ROOF SHEATHING

A. Wood Sheathing:

1. Plywood Roof Sheathing: Exterior, Structural I sheathing.

2. Oriented-Strand-Board Roof Sheathing: Exposure 1, Structural I sheathing.

3. Thickness of roof sheathing material shall match existing with a minimum thickness of 5/8 inch.

4. Fasteners: Size and type indicated.

a. For roof sheathing, provide fasteners[ with hot-dip zinc coating complying with ASTM A 153/A 153M of Type 304 stainless steel.

b. Power-Driven Fasteners: CABO NER-272.

2.8 FRAMING

A. Dimension Lumber:

1. Provide dressed lumber, S4S, marked with grade stamp of inspection agency.

2. Framing Other Than Non-Load-Bearing Interior Partitions: Douglas fir or hem-fir, construction or

No. 2 grade.

3. Maximum Moisture Content: 15 percent for 2-inch nominal (38-mm actual) thickness or less, 19 percent for more than 2-inch nominal (38-mm actual) thickness.

4. Labeling Requirements: Kiln dried material and other wood members shall be identified with an appropriate stamp on each piece according to WCLIB or WWPA.

5. Lumber damaged in offloading shall be replaced at no cost to the government.

6. Provide for nailers, blocking, and similar members.

METAL ROOF PANELS, STANDING SEAM 074113.16 - 5

7. Fasteners: Size and type indicated. Where rough carpentry is exposed to weather, in ground contact, or in area of high relative humidity, provide fasteners with hot-dip zinc coating complying with ASTM A 153/A 153M.

a. Power-Driven Fasteners: CABO NER-272.

b. Bolts: Steel bolts complying with ASTM A 307, Grade A (ASTM F 568, Property

Class 4.6); with ASTM A 563 (ASTM A 563M) hex nuts and flat washers.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine metal roof panel system substrate and supports with Installer present. Inspect for erection tolerances and other conditions affecting metal panel installation.

1. Inspect metal panel substrate to determine if components are installed as indicated on approved shop drawings. Confirm presence of acceptable supports at recommended spacing to match installation requirements of metal roof panels.

2. Panel Support Tolerances: Confirm that panel supports are within tolerances acceptable to metal roof panel system manufacturer.

B. Examine roughing-in for items penetrating metal panels to verify actual locations of penetrations properly located in relation to seam locations of metal panels.

C. Correct out-of-tolerance work and other deficient conditions prior to proceeding with metal panel system installation.

3.2 PREPARATION

A. Roof Repairs: Make all necessary repairs to damaged roof deck sheathing, rafters, fascia, and soffit.

B. Flashings: Provide flashings as required to complete metal roof panel system. Install in accordance with Section 076200 "Sheet Metal Flashing and Trim" and approved shop drawing.

3.3 UNDERLAYMENT INSTALLATIONS

A. Install Ice Dam self-adhering underlayment according to manufacturer's written instructions and recommendations in ASTM D 6135.

1. Clean, prepare, and treat substrates. Provide clean, dust-free, and dry substrates for waterproofing application.

2. Remove oil, form-release agents, curing compounds, and other contaminants or coatings.

3. Remove projections and fill honeycomb, aggregate pockets, holes, and other voids.

4. Apply underlayment 6 feet wide along eaves and in valleys.

5. Apply and firmly adhere sheets. Accurately align sheets and maintain uniform 2-1/2-inch- (64-mm-) minimum lap widths and end laps. Overlap and seal seams and stagger end laps.

B. Felt Underlayment: Comply with installation requirements of underlayment manufacturer. Apply over entire roof surface, wrinkle free, in shingle fashion to shed water. Cover underlayment within specified period.

METAL ROOF PANELS, STANDING SEAM 074113.16 - 6

3.4 METAL PANEL INSTALLATION

A. Standing Seam Metal Roof Panels: Install weathertight metal panel system in accordance with manufacturer's written instructions, approved shop drawings, and project drawings. Install metal roof panels in orientation, sizes, and locations indicated, assuring that the roof is square, straight, flat and in-plane. Anchor panels and other components securely in place. Provide for thermal and structural movement.

1. Apply slip sheet over underlayment before installing metal roof panels.

B. Attach panels to supports using clips, screws, fasteners, and sealants recommended by manufacturer and indicated on approved shop drawings.

1. Fasten metal panels to plywood deck with concealed panel clips, fasteners at each location indicated on approved shop drawings, with spacing and fasteners indicated.

2. Snap Lock Joint: Snap lock standing seams together so that clip and metal roof panel are completely engaged.

3. Provide weatherproof jacks for pipe and conduit penetrating metal panels of types recommended by manufacturer.

4. Dissimilar Materials: Where elements of metal panel system will come into contact with dissimilar materials, treat faces and edges in contact with dissimilar materials as recommended by manufacturer

3.5 ACCESSORY INSTALLATION

A. General: Install metal panel trim, flashing, and accessories using recommended fasteners and joint sealers, with positive anchorage to building, and with weather tight mounting. Coordinate installation with flashings and other components.

1. Install components required for a complete metal panel assembly, including trim, copings, flashings, sealants, closure strips, and similar items.

2. Comply with details of assemblies utilized to establish compliance with performance requirements and manufacturer's written installation instructions.

3. Provide concealed fasteners except where noted on approved shop drawings.

4. Set units true to line and level as indicated. Install work with laps, joints, and seams that will be permanently weather resistant.

5. Provide metal closures at rake edges each side of ridge caps.

6. Flash and seal metal roof panels with weather closures at eaves, rakes, and perimeter of all openings.

7. Install ridge caps as metal roof panel work proceeds.

B. Joint Sealers: Install joint sealers where indicated and where required for weathertight performance of metal panel assemblies, in accordance with manufacturer's written instructions.

1. Prepare joints and apply sealants per requirements of Division 07 Section "Joint Sealants."

C. Pipe Flashing: Form flashing around pipe penetration. Fasten and seal to metal roof panels as recommended by metal panel manufacturer.

3.6 CLEANING AND PROTECTION

A. Remove temporary protective films immediately in accordance with metal roof panel manufacturer's instructions. Clean finished surfaces as recommended by metal roof panel manufacturer.

B. Replace damaged panels and accessories that cannot be repaired to the satisfaction of the Contracting Officer.

METAL ROOF PANELS, STANDING SEAM 074113.16 - 7

END OF SECTION 074113.16

SHEET METAL FLASHING AND TRIM 076200 - 1

SECTION 076200 - SHEET METAL FLASHING AND TRIM

1.1 SECTION REQUIREMENTS

A. Submittals: Product Data, and Shop Drawings.

B. Coordinate installation of sheet metal flashing and trim with adjoining roofing and wall materials, joints, and seams to provide a leak-proof, secure, and noncorrosive installation.

C. Fabricator Qualifications: For copings and low-slope roof edge flashings that are SPRI ES-1 tested and FM Approvals approved, shop shall be listed as able to fabricate required details as tested and approved.

D. Warranty on Finishes: Manufacturer agrees to repair or replace sheet metal flashing and trim that shows evidence of deterioration of factory-applied finishes within 20 years.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Standard: Comply with NRCA's "The NRCA Roofing Manual" unless otherwise indicated. Conform to dimensions and profiles shown unless more stringent requirements are indicated.

B. FM Approvals' Listing: Manufacture and install roof edge flashings that are listed in FM Approvals' "RoofNav" and approved for windstorm classification, Class 1-60. Identify materials with name of fabricator and design approved by FM Approvals.

C. SPRI Wind Design Standard: Manufacture and install roof edge flashings tested according to SPRI ES-1 and capable of resisting the following design pressure:

1. Design Pressure: 30 psf.

2.2 SHEET METAL

A. Metallic-Coated Steel Sheet: Galvanized steel sheet, ASTM A 653/A 653M, G90 (Z275); 0.022-inch (0.56-mm) nominal thickness.

1. Finish: Manufacturer's standard two-coat fluoropolymer system with color coat containing not less than 70 percent PVDF resin by weight.

2.3 ACCESSORIES

A. Felt Underlayment: ASTM D 226, Type II (No. 30), asphalt-saturated organic felts.

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

C. Fasteners: annular-threaded nails, self-tapping screws, self-locking rivets and bolts, and other suitable fasteners according to manufacturer’s recommendation.

1. Exposed Fasteners: Heads matching color of sheet metal roofing using plastic caps or factory-applied coating.

SHEET METAL FLASHING AND TRIM 076200 - 2

D. Butyl Sealant: ASTM C 1311, solvent-release butyl rubber sealant.

2.4 FABRICATION

A. Fabricate sheet metal flashing and trim to comply with roof manufacturer’s recommendations for design, dimensions, geometry, thickness and other characteristics.

B. Expansion Provisions: Where lapped expansion provisions cannot be used, form expansion joints of intermeshing hooked flanges, not less than 1 inch (25 mm) deep, filled with butyl sealant concealed within joints.

C. Fabrication Tolerances: Fabricate sheet metal flashing and trim that are capable of installation to tolerances specified in MCA's "Guide Specification for Residential Metal Roofing."

PART 3 - EXECUTION

3.1 INSTALLATION

A. Comply with cited sheet metal standards. Allow for thermal expansion; set true to line and level. Install Work with laps, joints, and seams permanently watertight and weatherproof; conceal fasteners where possible.

B. Sealant Joints: Where movable, nonexpansion-type joints are required, form metal to provide for proper installation of elastomeric sealant according to cited sheet metal standard.

C. Seams: Fabricate nonmoving seams with flat-lock seams.

D. Metal Protection: Where dissimilar metals contact each other, protect against galvanic action or corrosion by painting contact surfaces with bituminous coating.

END OF SECTION 076200