Specifications.pdf

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METAL ROOF PANELS

SECTION 07 41 13

METAL ROOF PANELS

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes the following:

1. Factory-formed and field-assembled, concealed-fastener, lap-seam / lock seam metal roof panels.

1.2 PERFORMANCE REQUIREMENTS

A. Wind-Uplift Resistance: Comply with UL 580 for wind-uplift resistance class indicated.

B. Structural Performance: Capable of withstanding the effects of gravity loads and the following loads and stresses, based on testing according to

ASTM E 1592:

1. Wind Loads: Minimum design wind pressures of 90psf acting inward or out-ward.

2. Deflection Limits: Vertical deflections no greater than 1/240 of the span.

1.3 SUBMITTALS

A. Product Data: For each type of metal roof panel and accessory indicated.

1. Include details of edge conditions, joints, panel profiles, corners, anchorages, trim, flashings, closures, and accessories.

B. Coordination Drawings: Drawn to scale and coordinating metal roof panel in-stallation with penetrations and roof-mounted items.

C. Samples: For each exposed finish.

D. Material certificates.

E. Maintenance data.

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1.4 WARRANTY

A. Special Warranty: Manufacturer's standard form in which manufacturer agrees to repair or replace components of metal roof panel assemblies that fail in materials or workmanship within specified warranty period.

1. Failures include, but are not limited to, the following:

a. Structural failures, including rupturing, cracking, or puncturing.

b. Deterioration of metals, metal finishes, and other materials beyond normal weathering.

2. Warranty Period: 40 years or more, from date of Substantial Completion.

B. Special Warranty on Panel Finishes: Manufacturer's standard form in which manufacturer agrees to repair finish or replace metal roof panels that show evidence of deterioration of factory-applied finishes within specified war-ranty period.

1. Siliconized Polyester Finish Warranty Period: Period to extend 20 years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 PANEL MATERIALS

A. Metallic-Coated Steel Sheet Prepainted with Coil Coating: Steel sheet metal-lic coated by the hot-dip process and prepainted by the coil-coating process to comply with ASTM A 755/A 755M.

1. Aluminum-Zinc Alloy-Coated Steel Sheet: ASTM A 792/A 792M, Class AZ50 coating designation, Grade 40 (Class AZM150 coating designation, Grade 275);

structural quality.

2. 26 Gauge Steel

3. Surface: Smooth, flat finish.

4. Exposed Finishes:

a. Siliconized-Polyester Coating: Dry film thickness of not less than 0.2 mil

(0.005 mm) for an epoxy primer, and 0.8 mil (0.02 mm) for topcoat.

5. Concealed Finish: White or light-colored acrylic or polyester backer finish.

B. Panel Sealants:

1. Joint Sealant: ASTM C 920; as recommended in writing by metal roof panel manufacturer.

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2.2 UNDERLAYMENT MATERIALS

A. Felts: ASTM D 226, Type I (No. 15), asphalt-saturated organic felts.

B. Self-Adhering, High-Temperature Sheet: 30 to 40 mils (0.76 to 1.0 mm) thick minimum, consisting of slip-resisting polyethylene-film top surface lami-nated to layer of butyl or SBS-modified asphalt adhesive, with release-paper backing; cold applied. Provide primer when recommended by underlay-ment manufacturer.

1. Thermal Stability: Stable after testing at 240 deg F (116 deg C); ASTM D 1970.

2. Low Temperature Flexibility: Passes after testing at minus 20 deg F (29 deg C);

ASTM D 1970.

2.3 MISCELLANEOUS MATERIALS

A. Fasteners: Self-tapping screws, bolts, nuts, self-locking rivets and bolts, end-welded studs, and other suitable fasteners designed to withstand design loads.

1. Fasteners for Roof Panels: Self-drilling or self-tapping, zinc-plated, hex-head carbon-steel screws, with a stainless-steel cap or zinc-aluminum-alloy head and

EPDM or neoprene sealing washer.

2. Fasteners for Flashing and Trim: Blind fasteners or self-drilling screws with hex washer head.

3. Blind Fasteners: High-strength aluminum or stainless-steel rivets.

4. Snow Guards: Ram Guard by S-5 with S-5 Utility Clamp or equivalent.

2.4 METAL ROOF PANELS

A. Standing-Seam Metal Roof Panels: Factory-formed, designed to be field as-sembled by lapping and interconnecting raised side edges of adjacent panels with joint type indicated and attaching panels to supports using concealed clips in side laps. Include clips, cleats, pressure plates, and accessories re-quired for weathertight installation.

1. Steel Panel Systems: Comply with ASTM E 1514.

2. Type: Vertical rib, snap joint.

3. Material: Metallic-coated steel sheet, 0.0159 inch (0.40 mm) thick.

a. Exterior Finish: Silicone polyester.

b. Color As selected by COR from manufacturer's full range.

4. Clips: Fixed

a. Material: Metallic-coated-steel sheet.

5. Joint Type: As standard with manufacturer.

6. Panel Coverage: 16”

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7. Panel Height: 1.5”

8. Uplift Rating: UL 90.

2.5 ACCESSORIES

A. Roof Panel Accessories: Provide components required for a complete metal roof panel assembly including trim, copings, fasciae, corner units, ridge clo-sures, flashings, sealants, gaskets, fillers, closure strips, and similar items.

Match material and finish of metal roof panels, unless otherwise indicated.

1. Closures: Provide closures at eaves and ridges, fabricated of same metal as met-al roof panels.

2. Closure Strips: Closed-cell, expanded, cellular, rubber or crosslinked, polyole-fin-foam or closed-cell laminated polyethylene; minimum 1-inch- (25-mm-) thick, flexible closure strips; cut or premolded to match metal roof panel profile.

Provide closure strips where indicated or necessary to ensure weathertight con-struction.

B. Flashing and Trim: Formed from 0.0179-inch- (0.45-mm-) thick, metallic-coated steel sheet. Provide flashing and trim as required to seal against weather and to provide finished appearance. Locations include eaves, rakes, corners, bases, framed openings, ridges, fasciae, and fillers. Finish flashing and trim with it finishes system as adjacent metal roof panels.

C. Gutters: Formed from 0.0179-inch- (0.45-mm-) thick, metallic-coated steel sheet. Match profile of gable trim, complete with end pieces, outlet tubes, and other special pieces as required. Fabricate in minimum 96-inch- (2400-mm-) long sections, sized according to SMACNA's "Architectural Sheet

Metal Manual." Furnish gutter supports spaced 36 inches (900 mm) o.c., fabricated from same metal as gutters. Provide bronze, copper, or alumi-num wire ball strainers at outlets. Finish gutters to match roof fascia and rake trim.

D. Downspouts: Formed from 0.0179-inch- (0.45-mm-) thick, metallic-coated steel sheet; in 10-foot- (3-m-) long sections complete with formed elbows and offsets. Finish downspouts to match metal roof panels.

E. Snow Guards: Furnish and install Snow Guards on 2 rows. Install Snow

Guards at 32” O.C. (every other vertical joint) each row spaced 32” and staggered with other row. Utilize S-5 Utility clamp for lock seam roofs.

F. Wood Sleepers: Furnish and install nominal 2”x 4” S4S, #2 Kiln Dried lumber

@ 16” O.C. as framework for retrofit of metal roofing.

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2.6 FABRICATION

A. General: Fabricate and finish metal roof panels and accessories at the factory to greatest extent possible, by manufacturer's standard procedures and processes, as necessary to fulfill indicated performance requirements dem-onstrated by laboratory testing. Comply with indicated profiles and with dimensional and structural requirements.

B. Provide panel profile, including major ribs and intermediate stiffening ribs, if any, for full length of panel. Panel shall be manufactured with a striated profile.

C. Where indicated, fabricate metal roof panel joints with factory-installed cap-tive gaskets or separator strips that provide a tight seal and prevent metal-to-metal contact, in a manner that will minimize noise from movements within panel assembly.

D. Sheet Metal Accessories: Fabricate flashing and trim to comply with recom-mendations in SMACNA's "Architectural Sheet Metal Manual" that apply to the design, dimensions, metal, and other characteristics of item indicated.

E. Protect mechanical and painted finishes on exposed surfaces from damage by applying a strippable, temporary protective covering before shipping.

PART 3 - EXECUTION

3.1 PREPARATION

A. Install flashings and other sheet metal to comply with requirements specified in Division 7 Section "Sheet Metal Flashing and Trim."

3.2 UNDERLAYMENT INSTALLATION

A. Polyethylene Sheet Underlayment: Install polyethylene sheet on roof sheath-ing under metal roof panels. Use adhesive for anchorage. Apply at loca-tions as indicated by the manufacturer, in shingle fashion to shed water, with lapped and taped joints of not less than 2 inches (50 mm).

B. Felt Underlayment: Install felt underlayment and building-paper slip-sheet on roof sheathing under metal roof panels. Use adhesive for temporary an-chorage. Apply over roof sheathing, in shingle fashion to shed water, with lapped joints of not less than 2 inches (50 mm).

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C. Self-Adhering Sheet Underlayment: Install self-adhering sheet underlayment;

wrinkle free, on roof sheathing under metal roof panels. Comply with tem-perature restrictions of underlayment manufacturer for installation; use pri-mer rather than nails for installing underlayment at low temperatures. Ap-ply at roof decking above eaves (24”), in shingle fashion to shed water, with end laps of not less than 6 inches (150 mm) staggered 24 inches (600 mm) between courses. Overlap side edges not less than 3-1/2 inches (90 mm).

Cover underlayment within 14 days.

D. Install drip edge over underlayment before installing metal roof panels.

3.3 WOOD SLEEPER INSTALLATION

A. Install nominal S4S Kiln Dried 2” x 4” wood sleepers over underlayment. The wood sleepers shall be installed @ 16” O.C. to support the metal roofing.

3.4 METAL ROOF PANEL INSTALLATION, GENERAL

A. General: Provide metal roof panels of full length from eave to ridge, unless otherwise indicated or restricted by shipping limitations. Anchor metal roof panels and other components of the Work securely in place, with provisions for thermal and structural movement.

1. Field cutting of metal roof panels by torch is not permitted.

2. Rigidly fasten eave end of metal roof panels and allow ridge end free movement due to thermal expansion and contraction. Predrill panels.

3. Provide metal closures at peaks, rake edges, rake walls, and each side of ridge and hip caps.

4. Flash and seal metal roof panels with weather closures at eaves, rakes, and at pe-rimeter of all openings. Fasten with self-tapping screws.

5. Install 2” wd. Lateral supports to compensate for lack of structural integrity of roof sheathing over entire roof.

6. Lap metal flashing over metal roof panels to allow moisture to run over and off the material.

B. Fasteners:

1. Steel Roof Panels: Use stainless-steel fasteners for surfaces exposed to the exte-rior and galvanized steel fasteners for surfaces exposed to the interior.

2. Aluminum Roof Panels: Use aluminum or stainless-steel fasteners for surfaces exposed to the exterior and aluminum or galvanized steel fasteners for surfaces exposed to the interior.

C. Metal Protection: Where dissimilar metals will contact each other or corro-sive substrates, protect against galvanic action by painting contact surfaces with bituminous coating, by applying rubberized-asphalt underlayment to each contact surface, or by other permanent separation as recommended by metal roof panel manufacturer.

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1. Coat back side of aluminum roof panels with bituminous coating where roof pa-nels will contact wood, ferrous metal, or cementitious construction.

D. Joint Sealers: Install gaskets, joint fillers, and sealants where indicated and where required for weatherproof performance of metal roof panel assem-blies.

1. Seal metal roof panel end laps with double beads of tape or sealant, full width of panel. Seal side joints where recommended by metal roof panel manufacturer.

3.5 FIELD-ASSEMBLED METAL ROOF PANEL INSTALLATION

A. Standing-Seam Metal Roof Panels: Fasten metal roof panels to supports with concealed clips at each standing-seam joint at location, spacing, and with fasteners recommended by manufacturer.

1. Snap Joint: Nest standing seams and fasten together by interlocking and com-pletely engaging factory-applied sealant.

3.6 ACCESSORY INSTALLATION

A. General: Install accessories with positive anchorage to building and weather-tight mounting and provide for thermal expansion. Coordinate installation with flashings and other components.

1. Install components required for a complete metal roof panel assembly including trim, copings, ridge closures, seam covers, flashings, sealants, gaskets, fillers, closure strips, and similar items.

2. Comply with performance requirements, manufacturer's written installation in-structions, and SMACNA's "Architectural Sheet Metal Manual." Provide con-cealed fasteners where possible, and set units true to line and level as indicated.

Install work with laps, joints, and seams that will be permanently watertight and weather resistant.

3. Provide elbows at base of downspouts to direct water away from building.

4. Tie downspouts to underground drainage system indicated.

5. Install Snow Guards as indicated above.

3.7 CLEANING AND PROTECTION

A. Remove temporary protective coverings and strippable films, if any, as metal roof panels are installed, unless otherwise indicated in manufacturer's writ-ten installation instructions. On completion of metal roof panel installation, clean finished surfaces as recommended by metal roof panel manufacturer.

Maintain in a clean condition during construction.

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