BNGR074113 Revision 1.pdf

BNGR074113.HGR 074113-1 REVISED BY AMENDMENT 003

SECTION 074113 - METAL ROOF PANELS

PART 1 - GENERAL

1.01 SUMMARY:

A. This Section includes the following:

1. Factory-formed and field-assembled, standing-seam roof panels.

2. Metal soffit panels.

B. Related Sections include the following:

1. For steel roof deck supporting metal roof panels: SECTION 053123.

2. For secondary support framing supporting metal roof panels: SECTION 054000.

3. For fasciae, copings, flashings and other sheet metal work not part of metal roof panel assemblies: SECTION 076000.

4. For field-applied sealants not otherwise specified in this Section: SECTION 079200.

1.02 REFERENCES:

A. American Architectural Manufacturers Association (AAMA):

1. 611 - Voluntary Specification for Anodized Architectural Aluminum.

2. 2604 - Voluntary Specification, Performance Requirements, and Test Procedures for

High Performance Organic Coatings on Aluminum Extrusions and Panels.

3. 2605 - Voluntary Specification, Performance Requirements, and Test Procedures for

Superior Performing Organic Coatings on Aluminum Extrusions and Panels.

B. American Society for Testing and Materials (ASTM):

1. A641/A641M - Zinc-Coated (Galvanized) Carbon Steel Wire.

2. A653/A653M - Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated

(Galvannealed) by the Hot-Dip Process.

3. A666 - Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat

Bar.

4. A755/A755M - Steel Sheet, Metallic Coated by the Hot-Dip Process and Prepainted by the Coil-Coating Process for Exterior Exposed Building Products.

5. A792/A792M - Steel Sheet, 55% Aluminum-Zinc Alloy-Coated by the Hot-Dip Process.

6. B209/B209M - Aluminum and Aluminum-Alloy Sheet and Plate.

7. B370 - Copper Sheet and Strip for Building Construction.

8. C36 - Gypsum Wallboard.

9. C209 - Test Methods for Cellulosic Fiber Insulating Board.

10. C236 - Test Method for Steady-State Thermal Performance of Building Assemblies by

Means of a Guarded Hot Box.

11. C273 - Test Method for Shear Properties in Flatwise Plane of Flat Sandwich

Constructions or Sandwich Cores.

12. C297 - Test Method for Tensile Strength of Flat Sandwich Constructions in Flatwise

Plane.

13. C442 - Gypsum Backing Board and Coreboard.

14. C518 - Test Method for Steady-State Heat Flux Measurements and Thermal

Transmission Properties by Means of the Heat Flowmeter Apparatus.

15. C578 - Rigid, Cellular Polystyrene Thermal Insulation.

16. C591 - Unfaced Preformed Rigid Cellular Polyisocyanurate Thermal Insulation.

17. C612 - Mineral Fiber Block and Board Thermal Insulation.

18. C645 - Nonstructural Steel Framing Members.

19. C665 - Mineral-Fiber Blanket Thermal Insulation for Light Frame Construction and

Manufactured Housing.

SECTION 074113 - METAL ROOF PANELS: continued

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20. C728 - Perlite Thermal Insulation Board.

21. C754 - Installation of Steel Framing Members to Receive Screw Attached Gypsum panel

Products.

22. C920 - Elastomeric Joint Sealants.

23. C991 - Flexible Glass Fiber Insulation for Pre-Engineered Metal Buildings.

24. C1136 - Flexible, Low Permeance Vapor Retarders for Thermal Insulation.

25. C1177/C1177M - Glass Mat Gypsum Substrate for Use as Sheathing.

26. C1289 - Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board.

27. C1311 - Solvent Release Sealants.

28. D226 - Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing.

29. D1494 - Test Method for Diffuse Light Transmission Factor of Reinforced Plastic Panels.

30. D1621 - Test Method for Compressive Properties of Rigid Cellular Plastics.

31. D1622 - Test Method for Apparent Density of Rigid Cellular Plastics.

32. D1970 - Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep

Roofing Underlayment for Ice Dam Protection.

33. D2126 - Test Method for Response of Rigid Cellular Plastics to Thermal and Humid

Aging.

34. D2244 - Test Method for Calculation of Color Differences from Instrumentally Measured

Color Coordinates.

35. D2856 - Test Method for Open-Cell Content of Rigid Cellular Plastics by the Air

Pycnometer.

36. D3841 - Glass-Fiber-Reinforced Polyester Plastic Panels.

37. D4214 - Test Methods for Evaluating Degree of Chalking of Exterior Paint Films.

38. D4397 - Polyethylene Sheeting for Construction, Industrial, and Agricultural

Applications.

39. E84 - Test Method for Surface Burning Characteristics of Building Materials.

40. E96 - Test Methods for Water Vapor Transmission of Materials.

41. E108 - Test Methods for Fire Tests of Roof Coverings.

42. E119 - Test Methods for Fire Tests of Building Construction and Materials.

43. E136 - Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C.

44. E283 - Test Method for Determining the Rate of Air Leakage through Exterior Windows, Curtain Walls, and Doors under Specified Pressure Differences across the Specimen.

45. E329 - Agencies Engaged in the Testing and/or Inspection of Materials Used in

Construction.

46. E330 - Test Method for Structural Performance of Exterior Windows, Curtain Walls, and

Doors by Uniform Static Air Pressure Difference.

47. E331 - Test Method for Water Penetration of Exterior Windows, Curtain Walls, and

Doors by Uniform Static Air Pressure Difference.

48. E548 - Guide for General Criteria Used for Evaluating Laboratory Competence.

49. E903 - Test Method for Solar Absorptance, Reflectance, and Transmission of Materials

Using Integrating Spheres.

50. E1514 - Structural Standing Seam Steel Roof Panel Systems.

51. E1592 - Test Method for Structural Performance of Sheet Metal Roof and Siding

Systems by Uniform Static Air Pressure Difference.

52. E1637 - Structural Standing Seam Aluminum Roof Panel Systems.

53. E1646 - Test Method for Water Penetration of Exterior Metal Roof Panel Systems by

Uniform Static Air Pressure Difference.

54. E1680 - Test Method for Rate of Air Leakage through Exterior Metal Roof Panel

Systems.

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C. American Society of Civil Engineers (ASCE):

1. 7 - Minimum Design Loads for Buildings and Other Structures.

D. Factory Mutual Global (FMG):

1. 4470 - Approval Standard, Class I Roof Covers.

2. 4471 - Approval Standard, Class I Panel Roofs.

3. Approval Guide.

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

1. Metal Finishes Manual for Architectural and Metal Products.

F. The North American Insulation Manufacturers Association (NAIMA):

1. 202 - Flexible Fiber Glass Insulation Used in Metal Buildings.

G. Sheet Metal and Air Conditioning Contractors' National Association (SMACNA):

1. Architectural Sheet Metal Manual.

H. The Society for Protective Coatings (SSPC):

1. Paint Specification No. 12: Cold Applied Asphalt Mastic (Extra Thick Film).

I. Underwriters Laboratories, Inc. (UL):

1. 580 - Tests for Uplift Resistance of Roof Assemblies.

2. Fire Resistance Directory.

J. NRCA Construction Details.

1.03 DEFINITIONS:

A. Metal Roof Panel Assembly: Metal roof panels, attachment system components, miscellaneous metal framing, thermal insulation, and accessories necessary for a complete weathertight roofing system.

B. Solar Flux: Direct and diffuse radiation from the sun received at ground level over the solar spectrum, expressed in watts per square meter.

C. Solar Reflectance: Fraction of solar flux reflected by a surface, expressed as a percent or within the range of 0.00 and 1.00.

1.04 PERFORMANCE REQUIREMENTS:

A. General: Provide metal roof panel assemblies that comply with performance requirements specified as determined by testing manufacturers' standard assemblies similar to those indicated for this Project, by a qualified testing and inspecting agency.

B. Air Infiltration: Air leakage through assembly of not more than 0.06 cfm/sq. ft. (0.3 L/s per sq. m) of roof area when tested according to ASTM E1680 at the following test-pressure difference:

1. Test-Pressure Difference: Negative 1.57 lbf/sq. ft. (75 Pa).

2. Positive Preload Test-Pressure Difference: Greater than or equal to 15.0 lbf/sq. ft.

(720 Pa) and the greater of 75% of building live load or 50% of building design positive wind-pressure difference.

3. Negative Preload Test-Pressure Difference: 50% of design wind-uplift-pressure difference.

C. Water Penetration: No water penetration when tested according to ASTM E1646 at the following test-pressure difference:

1. Test-Pressure Difference: 2.86 lbf/sq. ft. (137 Pa).

2. Positive Preload Test-Pressure Difference: Greater than or equal to 15.0 lbf/sq. ft.

(720 Pa) and the greater of 75% of building live load or 50% of building design positive wind-pressure difference.

3. Negative Preload Test-Pressure Difference: 50% of design wind-uplift-pressure difference.

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D. Water Absorption: Maximum 1.0% absorption rate by volume when tested according to

ASTM C209.

E. Wind-Uplift Resistance: Provide metal roof panel assemblies that comply with UL 580 for wind-uplift resistance Class 90.

F. Structural Performance: Provide metal roof panel assemblies capable of withstanding the effects of gravity loads and the following loads and stresses within limits and under conditions indicated, based on testing according to ASTM E1592:

1. Wind Loads: Determine loads based on the following minimum design wind pressures:

a. Uniform pressure as indicated on Drawings.

2. Snow Loads: 90 lbf/sq. ft. (kN/sq. m).

3. Deflection Limits: Engineer metal roof panel assemblies to withstand design loads with vertical deflections no greater than 1/180 of the span.

G. Thermal Movements: Provide metal roof panel assemblies that allow for thermal movements resulting from the following maximum change (range) in ambient and surface temperatures by preventing buckling, opening of joints, overstressing of components, failure of joint sealants, failure of connections, and other detrimental effects. Base engineering calculation on surface temperatures of materials due to both solar heat gain and nighttime-sky heat loss.

1. Temperature Change (Range): 120°F (67°C), ambient; 180°F (100°C), material surfaces.

H. Thermal Performance: Provide insulated metal roof panel assemblies with thermal-resistance value (R-value) indicated when tested according to ASTM C236 or ASTM C518.

I. Energy Performance: Provide roof panels with solar reflectance index not less than 78 for roofs with a slope equal or less than 2:12 and 29 for roofs with a slope greater than 2:12 when calculated according to ASTM E1980 based on testing identical products by a qualified testing agency.

1.05 SUBMITTALS:

A. Submit as specified in DIVISION 1.

B. Product Data: Include construction details, material descriptions, dimensions of individual components and profiles, and finishes for each type of metal roof panel and accessory.

C. Shop Drawings: Show fabrication and installation layouts of metal roof panels; details of edge conditions, joints, panel profiles, corners, anchorages, trim, flashings, closures, and accessories; and special details. Distinguish between factory- and field-assembled work.

1. Accessories: Include details of the following items, at a scale of not less than

1-1/2 inches per 12 inches (1:10):

a. Flashing and trim.

b. Gutters.

c. Downspouts.

d. Roof curbs.

e. Snow guards.

2. For installed products indicated to comply with design loads, include structural analysis data signed and sealed by the qualified professional engineer responsible for their preparation.

D. Coordination Drawings: Roof plans drawn to scale and coordinating penetrations and roof-mounted items. Show the following:

1. Roof panels and attachments.

2. Purlins and rafters.

3. Roof-mounted items including roof hatches, equipment supports, pipe supports and penetrations, lighting fixtures, snow guards, and items mounted on roof curbs.

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E. Samples for Initial Selection: For each type of metal roof panel indicated with factory-applied color finishes.

1. Include similar Samples of trim and accessories involving color selection.

F. Samples for Verification: For each type of exposed finish required, prepared on Samples of size indicated below.

1. Metal Roof and Soffit Panels: 12 inches (300 mm) long by actual panel width. Include fasteners, clips, closures, and other metal roof panel accessories.

2. Trim and Closures: 12 inches (300 mm) long. Include fasteners and other exposed accessories.

3. Accessories: 12-inch- (300-mm-) long Samples for each type of accessory.

G. Qualification Data: For Installer professional engineer testing agency.

H. Material Certificates: For thermal insulation and vapor retarders, signed by manufacturers.

I. Field quality-control inspection reports.

J. Product Test Reports: Based on evaluation of comprehensive tests performed by a qualified testing agency, for the following:

1. Metal Roof and Soffit Panels: Include reports for air infiltration, water penetration, thermal performance, fire-test-response characteristics, solar reflectance, and structural performance.

K. Maintenance Data: For metal roof panels to include in maintenance manuals.

L. Warranties: Special warranties specified in this Section.

M. LEED Submittals:

1. Product Test Reports for Credit SS 7.2: For roof panels, indicating that panels comply with solar reflectance index requirement.

2. Product Data for Credit MR 4.1 and Credit MR 4.2: Indicating percentages by weight of postconsumer and preconsumer recycled content for products having recycled content.

a. Include statement indicating costs for each product having recycled content.

1.06 QUALITY ASSURANCE:

A. Installer Qualifications: An employer of workers trained and approved by manufacturer.

1. Installer's responsibilities include fabricating and installing metal roof panel assemblies.

2. Contracting Officer Responsibility: Preparation of data for metal roof panels, including

Shop Drawings, based on testing and engineering analysis of manufacturer's standard units in assemblies similar to those indicated for this Project.

B. Testing Agency Qualifications: Qualified according to ASTM E329 for testing indicated, as documented according to ASTM E548.

C. Source Limitations: Obtain each type of metal roof panels through one source from a single manufacturer.

D. Product Options: Drawings indicate size, profiles, and dimensional requirements of metal roof panels and are based on the specific system indicated.

1. Do not modify intended aesthetic effects, as judged solely by Engineer, except with

Engineer's approval. If modifications are proposed, submit comprehensive explanatory data to Engineer for review.

E. Preinstallation Conference: Conduct conference at Project Site to comply with requirements in

DIVISION 1.

1.07 DELIVERY, STORAGE, AND HANDLING:

A. Deliver components, sheets, metal roof panels, and other manufactured items so as not to be damaged or deformed. Package metal roof panels for protection during transportation and handling.

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B. Unload, store, and erect metal roof panels in a manner to prevent bending, warping, twisting, and surface damage.

C. Stack metal roof panels on platforms or pallets, covered with suitable weathertight and ventilated covering. Store metal roof panels to ensure dryness. Do not store metal roof panels in contact with other materials that might cause staining, denting, or other surface damage.

D. Protect strippable protective covering on metal roof panels from exposure to sunlight and high humidity, except to extent necessary for period of metal roof panel installation.

1.08 PROJECT CONDITIONS:

A. Weather Limitations: Proceed with installation only when existing and forecasted weather conditions permit assembly of metal roof panels to be performed according to manufacturers' written instructions and warranty requirements.

B. Field Measurements: Verify locations of roof framing and roof opening dimensions by field measurements before metal roof panel fabrication and indicate measurements on Shop Drawings.

1. Established Dimensions: Where field measurements cannot be made without delaying the Work, either establish framing and opening dimensions and proceed with fabricating metal roof panels without field measurements, or allow for field-trimming of panels.

Coordinate roof construction to ensure that actual building dimensions, locations of structural members, and openings correspond to established dimensions.

1.09 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: Two years 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 warranty period.

1. Fluoropolymer Finish: Deterioration includes, but is not limited to, the following:

a. Color fading more than 5 Hunter units when tested according to ASTM D2244.

b. Chalking in excess of a No. 8 rating when tested according to ASTM D4214.

c. Cracking, checking, peeling, or failure of paint to adhere to bare metal.

2. Finish Warranty Period: 20 years from date of Substantial Completion.

C. Special Weathertightness Warranty: Manufacturer's standard form in which manufacturer agrees to repair or replace metal roof panel assemblies that fail to remain weathertight, including leaks, within specified warranty period.

1. Weathertight Warranty Period: Five years from date of Substantial Completion.

D. Special Weathertightness Warranty for Standing-Seam Metal Roof Panels: Manufacturer's standard form in which manufacturer agrees to repair or replace standing-seam metal roof panel assemblies that fail to remain weathertight, including leaks, within specified warranty period.

1. Warranty Period: 20 years from date of Substantial Completion.

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PART 2 - PRODUCTS

2.01 PANEL MATERIALS:

A. Metallic-Coated Steel Sheet Prepainted with Coil Coating: Steel sheet metallic coated by the hot-dip process and prepainted by the coil-coating process to comply with ASTM A755/A755M.

1. Zinc-Coated (Galvanized) Steel Sheet: ASTM A653/A653M, G90 (Z275) coating designation; structural quality.

2. Surface: Smooth, flat finish.

3. Exposed Finishes: Apply the following coil coating, as specified or indicated on

Drawings.

a. High-Performance Organic Finish: Prepare, pretreat, and apply coating to exposed metal surfaces to comply with coating and resin manufacturers' written instructions.

(1) Fluoropolymer Two-Coat System: Manufacturer's standard two-coat, thermocured system consisting of specially formulated inhibitive primer and fluoropolymer color topcoat containing not less than 70% polyvinylidene fluoride resin by weight; complying with physical properties and coating performance requirements of AAMA 2604, except as modified below:

(a) Humidity Resistance: 1000 hours.

(b) Salt Spray Resistance: 1000 hours.

4. Concealed Finish: Apply pretreatment and manufacturer's standard white or light-colored acrylic or polyester backer finish, consisting of prime coat and wash coat with a minimum total dry film thickness of 0.5 mil (0.013 mm).

B. Recycled Content of Steel Products: Provide products with an average recycled content of steel products so postconsumer recycled content plus one-half of preconsumer recycled content is not less than 25%.

C. Panel Sealants:

1. Sealant Tape: Pressure-sensitive, 100% solids, gray polyisobutylene compound sealant tape with release-paper backing. Provide permanently elastic, nonsag, nontoxic, nonstaining tape 1/2 inch (13 mm) wide and 1/8 inch (3 mm) thick.

2. Joint Sealant: ASTM C920; elastomeric polyurethane, polysulfide, or silicone sealant; of type, grade, class, and use classifications required to seal joints in metal roof panels and remain weathertight; and as recommended in writing by metal roof panel manufacturer.

3. Butyl-Rubber-Based, Solvent-Release Sealant: ASTM C1311.

D. Refer to SECTION 072000 - BUILDING INSULATION.

2.02 UNDERLAYMENT MATERIALS:

A. Self-Adhering, Polyethylene-Faced Sheet: ASTM D1970, 40 mils (1.0 mm) thick minimum, consisting of slip-resisting polyethylene-film reinforcing and top surface laminated to SBS-modified asphalt adhesive, with release-paper backing; cold applied.

1. Products:

a. Dri-Start "A"; Carlisle Coatings & Waterproofing, Div. of Carlisle Companies Inc.

b. Grace Ice and Water Shield; Grace, W. R. & Co.

c. Perma-Seal PE; Henry Company.

d. Roof Defender; Johns Manville International, Inc.

e. AC Poly Ice and StormSeal; NEI Advanced Composite Technology.

f. WeatherLock; Owens Corning.

g. Polyguard Deck Guard; Polyguard Products, Inc.

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h. Rainproof TM; Protecto Wrap Company.

2.03 MISCELLANEOUS METAL FRAMING:

A. General: Comply with ASTM C754 for conditions indicated.

1. Steel Sheet Components: Complying with ASTM C645 requirements for metal and with ASTM A653/A653M, G60 zinc coating.

2.04 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. Provide exposed fasteners with heads matching color of metal roof panels by means of plastic caps or factory-applied coating.

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 Roof Panels: Self-drilling or self-tapping 410 stainless or zinc-alloy steel hex washer head, with EPDM or PVC washer under heads of fasteners bearing on weather side of metal roof panels.

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

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

2.05 ROOF PANELS:

A. Standing-Seam Roof Panels: Manufacturer's standard panels complying with the following:

1. Ribbed Roof Panels: Fabricate from metallic-coated steel sheets prepainted with coil coating, factory formed to provide 24-inch (610-mm) coverage; with 3-inch (76-mm-) high (including seam), raised trapezoidal major ribs at panel edges, and intermediate stiffening ribs symmetrically spaced between major ribs for full length of panel. Comply with the following:

a. Material: Zinc-coated (galvanized) steel.

b. Yield Strength: (50 ksi (345 MPa).) (80 ksi (552 MPa).)

c. Metal Thickness: 22 gauge.

d. Joint Type:

(1) Double-folded, mechanically seamed type.

e. Clip System: Fixed or floating to accommodate thermal movement as recommended and required.

B. Roof Liner Panels: Fabricate from metallic-coated steel sheets prepainted with coil coating, factory formed to provide 36-inch (914-mm) coverage, with raised major ribs at 12 inches (305

mm) o.c., and intermediate stiffening ribs symmetrically spaced between major ribs for full length of panel. Design panels for mechanical attachment to structure using exposed fasteners, lapping major ribs at panel edges. Comply with the following:

1. Material: Zinc-coated (galvanized) steel.

2. Yield Strength: (50 ksi (345 MPa).) (80 ksi (552 MPa).)

3. Metal Thickness: 22 gauge.

4. Panel Thickness: 1" minimum.

C. Roof Panel Accessories: Provide components required for a complete roof panel assembly including trim, copings, fasciae, mullions, sills, corner units, ridge closures, clips, seam covers, battens, flashings, gutters, sealants, gaskets, fillers, closure strips, and similar items. Match materials and finishes of roof panels, unless otherwise indicated.

1. Closures: Provide closures at eave and ridge, fabricated of same metal as roof panels.

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2. Clips: Minimum 0.0625-inch- (1.6-mm-) thick, galvanized steel panel clips designed to withstand negative-load requirements.

3. Cleats: Mechanically seamed cleats formed from minimum 0.0250-inch- (0.65-mm-) thick, stainless-steel or nylon-coated aluminum sheet.

4. Thermal Spacer Blocks: Where panels attach directly to purlins, provide 1-inchg- (25-mm-) thick, thermal spacer blocks; fabricated from extruded polystyrene.

5. Backing Plates: Provide metal backing plates at panel end splices, fabricated from material recommended by manufacturer.

D. Exterior Finish: Apply the following coil coating to roof panels and accessories:

1. Fluoropolymer Two-Coat System: Manufacturer's standard two-coat, thermocured system consisting of specially formulated inhibitive primer and fluoropolymer color topcoat containing not less than 70% polyvinylidene fluoride resin by weight, with a total minimum fry film thickness of 1 mil (0.025 mm) and 30% reflective gloss when tested according to ASTM D523.

a. Durability: Provide coating field tested under normal range of weather conditions for a minimum of 20 years without significant peel, blister, flake, chip, crack, or check in finish; without chalking in excess of a chalk rating of 8 according to ASTM D4214; and without fading in excess of five Hunter units.

2. Colors, Textures, and Glosses:

a. Match Contracting Officer's samples.

b. As indicated by referencing manufacturer's designations.

c. As selected by Engineers from manufacturer's full range for these characteristics.

E. Concealed Finish: Apply pretreatment and manufacturer's standard white or light-colored backer finish, consisting of prime coat and wash coat with a total minimum dry film thickness of 0.5 mil (0.013 mm).

2.06 ACCESSORIES:

A. Roof Panel Accessories: Provide components required for a complete metal roof panel assembly including trim, copings, fasciae, corner units, ridge closures, clips, 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 metal roof panels.

2. Clips: Minimum 0.0625-inch- (1.6-mm-) thick, stainless-steel panel clips designed to withstand negative-load requirements.

3. Cleats: Mechanically seamed cleats formed from minimum 0.0250-inch- (0.64-mm-) thick, stainless-steel or nylon-coated aluminum sheet.

4. Backing Plates: Provide metal backing plates at panel end splices, fabricated from material recommended by manufacturer.

5. Closure Strips: Closed-cell, expanded, cellular, rubber or crosslinked, polyolefin-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 construction.

B. Flashing and Trim: Formed from 0.0179-inch- (0.45-mm-) thick, zinc-coated (galvanized) steel sheet or aluminum-zinc alloy-coated steel sheet prepainted with coil coating. Provide flashing and trim as required to seal against weather and to provide finished appearance.

Locations include, but are not limited to, eaves, rakes, corners, bases, framed openings, ridges, fasciae, and fillers. Finish flashing and trim with same finish system as adjacent metal roof panels.

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C. Concealed Eave Gutters: Formed from 20 ga thick, stainless steel sheet. Fabricate in minimum 25'-0" (7620 mm) long sections, sized according to SMACNA's "Architectural Sheet Metal Manual."

D. Roof Curbs: Fabricated from 0.0478-inch- (1.2 mm-) thick, zinc-coated (galvanized) steel sheet or aluminum-zinc alloy-coated steel sheet prepainted with coil coating; with welded top box and bottom skirt, and integral full-length cricket. Fabricate curb subframing of minimum 0.0598-inch- (1.5 mm-) thick, angle-, C-, or Z-shaped steel sheet. Fabricate curb and subframing to withstand indicated loads, of size and height indicated. Finish roof curbs to match metal roof panels.

1. Insulate roof curb with 1-inch- (25-mm-) thick, rigid insulation.

E. Snow Guards: Prefabricated, noncorrosive units designed to be installed without penetrating metal roof panels, and complete with predrilled holes, clamps, or hooks for anchoring.

1. Seam-Mounted, Bar-Type Snow Guards: Stainless-steel rods or bars held in place by stainless-steel clamps attached to vertical ribs of standing-seam metal roof panels.

a. Stainless-Steel Finish: Mill.

b. Products:

(1) Model No. 05-98; Alpine Snow Guards, Div. of Vermont Slate & Copper Services, Inc.

(2) S-5! SnoFence; LMCurbs.

(3) Snobar; Riddell & Company, Inc.

(4) Vermont Snowguard; Snow Management Systems, a division of Contek, Inc.

F. Pipe Flashing: Premolded, EPDM pipe collar with flexible aluminum ring bonded to base.

2.07 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 demonstrated 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.

C. Where indicated, fabricate metal roof panel joints with factory-installed captive 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 recommendations in SMACNA's "Architectural Sheet Metal Manual" that apply to the design, dimensions, metal, and other characteristics of item indicated.

1. Form exposed sheet metal accessories that are without excessive oil canning, buckling, and tool marks and that are true to line and levels indicated, with exposed edges folded back to form hems.

2. Seams for Aluminum: Fabricate nonmoving seams with flat-lock seams. Form seams and seal with epoxy seam sealer. Rivet joints for additional strength.

3. Seams for Other Than Aluminum: Fabricate nonmoving seams in accessories with flat-lock seams. Tin edges to be seamed, form seams, and solder.

4. Sealed Joints: Form nonexpansion but movable joints in metal to accommodate elastomeric sealant to comply with SMACNA standards.

5. Conceal fasteners and expansion provisions where possible. Exposed fasteners are not allowed on faces of accessories exposed to view.

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6. Fabricate cleats and attachment devices from same material as accessory being anchored or from compatible, noncorrosive metal recommended by metal roof panel manufacturer.

a. Size: As recommended by SMACNA's "Architectural Sheet Metal Manual" or metal roof panel manufacturer for application but not less than thickness of metal being secured.

2.08 FINISHES, GENERAL:

A. Comply with NAAMM's "Metal Finishes Manual for Architectural and Metal Products" for recommendations for applying and designating finishes.

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

C. Appearance of Finished Work: Variations in appearance of abutting or adjacent pieces are acceptable if they are within one-half of the range of approved Samples. Noticeable variations in the same piece are not acceptable. Variations in appearance of other components are acceptable if they are within the range of approved Samples and are assembled or installed to minimize contrast.

PART 3 - EXECUTION

3.01 EXAMINATION:

A. Examine substrates, areas, and conditions, with Installer present, for compliance with requirements for installation tolerances, metal roof panel supports, and other conditions affecting performance of work.

1. Examine primary and secondary roof framing to verify that rafters, purlins, angles, channels, and other structural panel support members and anchorages have been installed within alignment tolerances required by metal roof panel manufacturer.

2. Examine solid roof sheathing to verify that sheathing joints are supported by framing or blocking and that installation is within flatness tolerances required by metal roof panel manufacturer.

B. Examine roughing-in for components and systems penetrating metal roof panels to verify actual locations of penetrations relative to seam locations of metal roof panels before metal roof panel installation.

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

3.02 PREPARATION:

A. Clean substrates of substances harmful to insulation, including removing projections capable of interfering with insulation attachment.

B. Install flashings and other sheet metal to comply with requirements specified in

SECTION 076000.

C. Install fasciae and copings to comply with requirements specified in DIVISION 7.

D. Miscellaneous Framing: Install subpurlins, eave angles, furring, and other miscellaneous roof panel support members and anchorage according to metal roof panel manufacturer's written recommendations.

1. Soffit Framing: Wire-tie or clip furring channels to supports, as required to comply with requirements for assemblies indicated.

3.03 UNDERLAYMENT INSTALLATION:

A. Self-Adhering Sheet Underlayment: Install self-adhering sheet underlayment, wrinkle free, on roof sheathing under metal roof panels. Apply primer if required by manufacturer. Comply

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with temperature restrictions of underlayment manufacturer for installation; use primer rather than nails for installing underlayment at low temperatures. Apply over entire roof 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. Extend underlayment into gutter trough. Roll laps with roller. Cover underlayment within 14 days.

B. Install flashings to cover underlayment to comply with requirements specified in

SECTION 076000.

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

3.04 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. Install panels perpendicular to purlins.

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

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

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

6. Locate and space fastenings in uniform vertical and horizontal alignment.

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

8. Locate panel splices over, but not attached to, structural supports. Stagger panel splices and end laps to avoid a four-panel lap splice condition.

9. 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 exterior and galvanized steel fasteners for surfaces exposed to the interior.

C. Metal Protection: Where dissimilar metals will contact each other or corrosive 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.

1. Coat back side of roof panels with bituminous coating where roof panels 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 assemblies. Provide types of gaskets, fillers, and sealants indicated or, if not indicated, types recommended by metal roof panel manufacturer.

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.

2. Prepare joints and apply sealants to comply with requirements in SECTION 079200.

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3.05 FIELD-ASSEMBLED METAL ROOF PANEL INSTALLATION:

A. Lap-Seam Metal Roof Panels: Fasten metal roof panels to supports with fasteners at each lapped joint at location and spacing recommended by manufacturer.

1. Arrange and nest side-lap joints so prevailing winds blow over, not into, lapped joints.

Lap ribbed or fluted sheets one full rib corrugation. Apply panels and associated items for neat and weathertight enclosure. Avoid "panel creep" or application not true to line.

2. Provide metal-backed washers under heads of exposed fasteners bearing on weather side of metal roof panels.

3. Locate and space exposed fasteners in uniform vertical and horizontal alignment. Use proper tools to obtain controlled uniform compression for positive seal without rupture of washer.

4. Install screw fasteners with power tools having controlled torque adjusted to compress washer tightly without damage to washer, screw threads, or panels. Install screws in predrilled holes.

5. Provide sealant tape at lapped joints of metal roof panels and between panels and protruding equipment, vents, and accessories.

6. Apply a continuous ribbon of sealant tape to weather-side surface of fastenings on end laps, and on side laps of nesting-type panels; on side laps of corrugated nesting-type, ribbed, or fluted panels; and elsewhere as needed to make panels weatherproof to driving rains.

7. At panel splices, nest panels with minimum 6-inch (150-mm) end lap, sealed with butyl-rubber sealant and fastened together by interlocking clamping plates.

B. 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. Install clips to supports with self-tapping fasteners.

2. Install pressure plates at locations indicated in manufacturer's written installation instructions.

3. Seamed Joint: Crimp standing seams with manufacturer-approved motorized seamer tool so clip, metal roof panel, and factory-applied sealant are completely engaged.

C. Metal Soffit Panels: Provide metal soffit panels full width of soffits. Install panels perpendicular to support framing.

1. Flash and seal panels with weather closures where metal soffit panels meet walls and at perimeter of all openings.

3.06 ACCESSORY INSTALLATION:

A. General: Install accessories with positive anchorage to building and weathertight 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.

B. Flashing and Trim: Comply with performance requirements, manufacturer's written installation instructions, and SMACNA's "Architectural Sheet Metal Manual." Provide concealed 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.

1. Install exposed flashing and trim that is without excessive oil canning, buckling, and tool marks and that is true to line and levels indicated, with exposed edges folded back to

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form hems. Install sheet metal flashing and trim to fit substrates and to result in waterproof and weather-resistant performance.

2. Expansion Provisions: Provide for thermal expansion of exposed flashing and trim.

Space movement joints at a maximum of 10 feet (3 m) with no joints allowed within 24 inches (600 mm) of corner or intersection. Where lapped or bayonet-type expansion provisions cannot be used or would not be sufficiently weather resistant and waterproof, form expansion joints of intermeshing hooked flanges, not less than 1 inch (25 mm) deep, filled with mastic sealant (concealed within joints).

C. Gutters: Join sections with riveted and soldered or lapped and sealed joints. Attach gutters to eave with gutter hangers spaced not more than 4 feet (1.2 m) o.c. using manufacturer's standard fasteners. Provide end closures and seal watertight with sealant. Provide for thermal expansion.

D. Roof Curbs: Install curbs at locations indicated on Drawings. Install flashing around bases where they meet metal roof panels.

E. Bar-Type Snow Guards: Attach bar supports to vertical ribs of standing-seam metal roof panels with clamps or set screws. Do not use fasteners that will penetrate metal roof panels.

1. Provide one row of snow guards, at locations indicated on Drawings.

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

3.07 ERECTION TOLERANCES:

A. Installation Tolerances: Shim and align metal roof panel units within installed tolerance of 1/4 inch in 20 feet (6 mm in 6 m) on slope and location lines as indicated and within 1/8-inch (3-

mm) offset of adjoining faces and of alignment of matching profiles.

3.08 FIELD QUALITY CONTROL:

A. Testing Agency: Engage a qualified independent testing and inspecting agency to perform inspections and prepare reports.

B. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect completed metal roof panel installation, including accessories. Report results in writing.

C. Remove and replace applications of metal roof panels where inspections indicate that they do not comply with specified requirements.

D. Additional inspections, at Contractor's expense, will be performed to determine compliance of replaced or additional work with specified requirements.

3.09 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 written 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.

B. Replace metal roof panels that have been damaged or have deteriorated beyond successful repair by finish touchup or similar minor repair procedures.

END OF SECTION 074113