SECTION 07613 SHEET STAINLESS STEEL ROOFING NOTE ** This section includes stainless steel sheet roofing. Styles include flat seam, standing seam, batten seam and horizontal seam (Bermuda style) systems. The section is intended to cover custom fabricated products, but may also be used for standard products. NOTE ** Information in this section is provided by the Specialty Steel Industry of the United States (SSIUS) which is a source of technical data on stainless steel. SSIUS has the capabilities for providing seminars, technical publications and can help facilitate design assistance on the use of stainless steel products for architectural and engineering applications. For additional information, contact SSIUS at: NOTE ** NOTE ** Specialty Steel Industry of the United States NOTE ** 3050 K Street, NW NOTE ** Washington, DC 20007 NOTE ** Tel: (202) 342-8630 NOTE ** Fax: (202) 342-8451 NOTE ** NOTE ** SECTION 07613 - SHEET STAINLESS STEEL ROOFING, Copyright 1998, The Architect's Catalog, Inc. NOTE ** Disclaimer: The Specialty Steel Industry of the United States (SSIUS) and the individual companies it represents have made every effort to ensure that the information presented in this specification is technically correct. However, neither the SSIUS nor its member companies warrants the accuracy of the information contained in this specification or its suitability for any general and specific use, the SSIUS assumes no liability or responsibility of any kind in connection with the use of this information. The reader is advised that the material contained herein should not be used or relied on for any specific or general applications without first securing competent advice. PART 1 GENERAL 1.1 SECTION INCLUDES NOTE ** Delete items below not required for project. A. Flat-seam stainless steel roofing. B. Standing-seam stainless steel roofing. C. Batten-seam stainless steel roofing. D. Horizontal-seam (Bermuda type) stainless steel roofing. E. Preformed stainless steel roofing. F. Custom-designed stainless steel roofing. 1.2 RELATED SECTIONS NOTE ** Delete any sections below not relevant to this project; add others as required. A. Section 05120 - Structural Steel: Roof framing. B. Section 05310 - Steel Deck. C. Section 06100 - Rough Carpentry: Roof framing and sheathing. D. Section 06150 - Wood Decking. E. Section 07210 - Building Insulation. F. Section 07623 - Sheet Stainless Steel Flashing: Stainless steel flashing and other trim not part of roofing. NOTE ** Edit the following paragraph to identify relevant items that are not included in this section but are included in the roof specialties section instead, such as reglets, elastic expansion joints, ornamental items. G. Section 07713 - Manufactured Stainless Steel Roof Specialties: Accessories on roof other than mechanical and structural items. H. Section 07900 - Joint Sealers. I. Section 09900 - Paints and Coatings: Field painting. 1.3 REFERENCES NOTE ** Delete references from the list below that are not actually required by the text of the edited section. A. ASCE 7 - Minimum Design Loads for Buildings and Other Structures; American Society of Civil Engineers. B. ASTM A 240/A 240M - Standard Specification for Heat Resisting Chromium and Chromium-Nickel Steel Plate, Sheet, and Strip for Pressure Vessels. C. ASTM A 308 - Standard Specification for Sheet, Terne (Lead-Tin Alloy) Coated by the Hot-Dip Process. D. ASTM E 907 - Standard Test Method for Field Testing Uplift Resistance of Roofing Systems Employing Steel Deck, Rigid Insulation and Bituminous Built-Up Roofing. E. SSIUS - Designer Handbook Series; Specialty Steel Industry of the United States (SSIUS). 1. Stainless Steel for Roofing, Flashings, Copings. 2. Design Guidelines for the Selection and Use of Stainless Steel. 3. Specifications for Stainless Steel. 4. Stainless Steel Fabrication. 5. Stainless Steel FastenersCA Systematic Approach to Their Selection. 6. Finishes for Stainless Steel. 7. Stainless Steel Architectural Facts. F. SMACNA - Architectural Sheet Metal Manual; Sheet Metal and Air Conditioning Contractors National Association, Inc.; fifth edition, 1993. 1.4 PERFORMANCE REQUIREMENTS NOTE ** Delete this entire article if the contractor or manufacturer is not required to design the roofing to particular performance criteria. An example is when the sheet metal roof is completely detailed without contractor options. A. Design roof assembly to conform to the requirements of ASCE 7, Minimum Design Loads for Buildings and Other Structures. NOTE ** Retain the paragraph below after consultation with roofing manufacturer. Delete if UL Class 90 roof is not required for the project, or modify if FM I- 90 or I-60 is required for the project. B. Wind Uplift: Provide roof assemblies meeting requirements of ASTM E 907 for UL Class 90 wind uplift resistance. 1.5 SUBMITTALS A. Submit in accordance with Section 01300. B. Product Data: Submit metal manufacturer's and fabricator's specifications, installation instructions, and general recommendations for roofing applications. C. Samples: 12 inch square specimens of specified stainless steel roofing material. D. Shop Drawings: Show manner of forming, joining, and securing stainless steel roofing, and pattern of seams. Show expansion joint details and waterproof connections to adjoining work and at obstructions and penetrations. 1.6 QUALITY ASSURANCE A. Installer Qualifications: A firm with 5 years of successful experience with installation of stainless steel roofing of type and scope equivalent to project requirements. NOTE ** Delete the following if not required. Custom work of special quality or complexity may justify the cost of an extensive mock-up. B. Mock-Up: Before proceeding with installation, prepare a mock-up incorporating materials and methods of fabrication and installation identical with project requirements. 1. Locate mock-up where indicated on drawings. 2. Retain accepted mock-up as quality standard for acceptance of completed roofing. 3. If accepted, mock-up may be incorporated as part of the work. PART 2 PRODUCTS 2.1 MANUFACTURERS NOTE ** Retain or insert manufacturers whose roofing systems comply with project requirements and whose availability for project have been verified. A. Provide products manufactured by one of the following: 1. Allegheny Ludlum Corporation. 2. Armco, Inc. 3. Avesta Sheffield, Inc. 4. Atlas Stainless Steels. 5. J & L Specialty Steel, Inc. 6. Lukens, Inc. 7. North American Stainless. NOTE ** Delete one of the two paragraphs below; coordinate with Division 1 requirements. B. Requests for substitutions will be considered in accordance with provisions of Section 01600. C. Substitutions: Not permitted. 2.2 SHEET METAL MATERIALS NOTE ** Select one of the following stainless steel types below: either uncoated stainless steel or terne- coated stainless steel. A. Stainless Steel Sheet for Roofing, Flashing, Accessories, and Batten Caps: ASTM A 240/A 240M, Type 304, fully annealed, dead soft temper. NOTE ** Delete all but one of the following thickness descriptions. Verify suitability and availability with roofing sheet manufacturer. 1. Thickness: 0.015 inch, 28 gauge, unless otherwise indicated. 2. Thickness: 0.018 inch, 26 gauge, unless otherwise indicated. 3. Thickness: 0.021 inch, 25 gauge, unless otherwise indicated. 4. Thickness: As indicated on drawings. NOTE ** Select finish below after consultation with material producer and roofing manufacturer; verify appropriate finish for project requirements. Other finishes are available. 5. Finish: No.2D (dull) mill rolled sheet finish. 6. Finish: ________. 7. Finish: As selected by Architect from roofing manufacturer's standards. B. Stainless Steel Sheet for Roofing, Flashing, Accessories, and Batten Caps: Terne-coated stainless steel sheet, complying with ASTM A 308, Type 304, fully annealed, dead soft temper. 1. Coating: Coat both sides of stainless steel sheet with terne alloy (80-20 lead/tin) in accordance with sheet metal manufacturer's standard nominal coating weight. NOTE ** Delete all but one of the following thickness descriptions. Verify suitability and availability with roofing sheet manufacturer. 2. Base Metal Thickness: 0.015 inch, 28 gauge, unless otherwise indicated. 3. Base Metal Thickness: 0.018 inch, 26 gauge, unless otherwise indicated. 4. Base Metal Thickness: 0.021 inch, 25 gauge, unless otherwise indicated. 5. Base Metal Thickness: As indicated on drawings. 6. Finish: Manufacturer's standard. C. Batten Bars and Strips: If size is not indicated, provide battens of nominal 2 inch by 2 inch size (1-1/2 inch by 1-1/2 inch minimum). 1. Batten Bars: Stainless steel, thickness same as sheet roofing material. 2. Wood Batten Strips: Fabricated to size indicated from lumber complying with requirements of Section 06100 - Rough Carpentry and preservative treated by pressure process using a chemical solution that is non-hygroscopic and non-corrosive to type of stainless steel roofing. D. Nails: Stainless steel, AISI Type 300 series, 0.109 inch minimum not less than 7/8 inch long ring or annular type. E. Screws and Bolts: Stainless steel, AISI Type 300 series. F. Cleats: Stainless steel, ____ inch thick, type ____; 2 inches wide x 3 inches long. G. Solder: Minimum 50-50 tin/lead solder for unexposed joints; minimum 80-20 tin/lead solder for color match at exposed joints. Use only phosphoric acid based flux for soldering stainless steel. NOTE ** Edit the following paragraph to delete items that are not relevant to project or which are specified in another section. H. Metal Accessories: Except as indicated as work of another specification section, provide all other components required for a complete roof system, including trim, copings, fascias, ridge closures, clips, seam covers, battens, flashings, gutters, louvers, and closure strips. Match materials and finishes of roof. I. Mastic Sealant: Polyisobutylene; non-hardening, non- migrating, heavy-bodied mastic sealant. J. Elastomeric Sealant: One-part elastomeric polyurethane, polysulfide, butyl, or silicone rubber sealant as recommended by the roofing manufacturer. K. Bituminous Coating: Cold-applied asphalt mastic, SSPC- Paint 12, compounded for 15 mil dry film thickness per coat, except as otherwise indicated; inert-type non- corrosive compound, nominally free of sulfur components and other deleterious impurities. 2.3 ACCESSORY MATERIALS NOTE ** Delete any of the accessory materials below that are not required for the project. A. Miscellaneous Materials: Provide protective coatings, separators, sealants and other accessory items as recommended by stainless steel sheet manufacturer and fabricator for stainless steel roofing work, except as otherwise indicated. B. Roofing Felt: Asphalt or coal tar saturated felt weighing not less than 30 lb per 100 square feet. C. Fabric Underlayment: Manufacturer's standard non-woven polyester fabric marketed for use in roofing systems weighing 6.0 oz per sq yd, white, non-swelling, rot and mildew resistant; type as recommended by roofing manufacturer. D. Slip Sheet: Minimum 4-lb rosin-sized building paper. E. Sealing Tape: Pressure-sensitive 100 percent solids polyisobutylene compound sealing tape with release paper backing. Provide permanently elastic, non-sag, non- toxic, non-staining tape. 2.4 METAL FABRICATION A. Shop-fabricate work to greatest extent possible. B. Conform to dimensions and profiles indicated. Comply with details shown and with applicable requirements of SMACNA Architectural Sheet Metal Manual and other recognized industry practices. C. Fabricate for waterproof and weather-resistant performance with expansion provisions for running work sufficient to permanently prevent leakage, damage, or deterioration of the work. D. Form work to fit substrate. Comply with material manufacturer's instructions and recommendations for forming material. Form exposed stainless steel work without excessive oil-canning, buckling, and avoidable tool marks, true to line and levels indicated, with exposed edges folded back to form hems. E. Form and fabricate sheets, seams, strips, cleats, valleys, ridges, edge treatments, integral flashings and other components of stainless steel roofing to profiles, patterns and drainage arrangements shown and as required for permanently leakproof construction. Provide for thermal expansion and contraction of the work, as indicated. F. Seams: Fabricate non-moving joints in stainless steel sheet with flat-lock seams. Tin edges to be seamed, form seams, and solder. Rivet joints for additional strength where indicated. G. Hooked-Type Joints: Where lapped or bayonet-type expansion provisions in work cannot be used, or would not be sufficiently water- or weatherproof, form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with mastic sealant concealed within joint. H. Sealant Joints: Where movable, non-expansion-type joints are indicated or required for proper performance of work, form stainless steel to provide for proper installation of elastomeric sealant, in compliance with SMACNA standard details. I. Separations: Provide for separation of stainless steel from different metal types and corrosive substrates by coating concealed surfaces at locations of contact with bituminous coating or other permanent separation as recommended by manufacturer or fabricator. PART 3 EXECUTION 3.1 PREPARATION A. Coordinate stainless steel roofing with rain drainage work, flashing, trim and construction of decks, parapets, walls, and other adjoining work to provide a permanently leakproof, secure, and non-corrosive installation. B. Clean surfaces to receive stainless steel roofing. Substrate to be smooth and free of defects. Drive projecting nails or other fasteners flush with substrate. 3.2 INSTALLATION NOTE ** Delete all installation instructions below that are not applicable to the project or the materials being installed. A. Except as otherwise shown or specified, comply with recommendations and instructions of manufacturer of stainless steel roofing being fabricated and installed and with SMACNA Architectural Sheet Metal Manual. B. Galvanic Action Protection: Isolate different metal types from each other to prevent galvanic action. NOTE ** Retain underlayment provisions below unless roofing manufacturer agrees that it is unnecessary. C. Install underlayment of slip sheet over a course of roofing felt under stainless steel roofing unless otherwise recommended by manufacturer of sheet metal. Use adhesive for temporary anchorage, where possible, to minimize use of mechanical fasteners under stainless steel roofing. Lap joints 2 inches minimum. D. Seal joints as shown and as required for leakproof construction. E. Hooked-Type Joints: 1. When ambient temperature is moderate at time of installation, 40 degrees to 70 degrees F (4 degrees to 21 degrees C), set joint members for 50 percent movement either way. 2. Adjust setting proportionately for installation at higher ambient temperatures. 3. Do not install at temperatures below 40 degrees F (4 degrees C). 4. Comply with requirements of Section 07900 for handling and installing sealants. F. Provide uniform, neat seams with minimum exposure of solder, welds, and sealant. G. In exposed work, conceal fasteners and expansion provisions where possible and locate so as to minimize possibility of leakage. Cover and seal fasteners and anchors as required for a tight installation. H. Soldering: Tin uncoated stainless steel surfaces for a width of 1-1/2 inches at edges, using solder recommended for stainless steel work. Exception: Where surfaces are terne-coated stainless steel, do not tin edges, but wire brush terne coating before soldering. 3.3 CLEANING A. Remove protective film (if any) from exposed surfaces of stainless steel roofing promptly upon installation. Strip with care to avoid damage to finishes. B. Clean exposed metal surfaces of substances that might cause staining, corrosion, or deterioration of finish or that would interfere with uniform oxidation and weathering. 3.4 PROTECTION A. Protect stainless steel roofing in a manner that ensures that the work is without damage or deterioration other than natural weathering at time of Substantial Completion. END OF SECTION