NOTE ** This section includes stainless steel flashing and trim custom-fabricated from stainless steel sheet or TCS sheet. Examples of flashing and trim items covered in this section include built-in valleys, scuppers, gutters and downspouts, etc.
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
A. Shop- and field-fabricated stainless steel flashing and trim, including:
NOTE ** Delete items below not required for project.
1. Counterflashing and base flashing.
2. Wall flashing and expansion joints.
3. Built-in valleys, gutters, and scuppers.
4. Gutters and downspouts.
5. Exposed trim/fascia units.
6. Miscellaneous accessories.
1.2 RELATED SECTIONS
NOTE ** Delete any sections below not relevant to this project; add others as required.
A. Section 04810 - Unit Masonry Assemblies: Stainless steel flashings embedded in masonry.
E. Section 07723 - Manufactured Stainless Steel Roof Specialties: Roof specialties and accessories units of manufactured type.
F. Section 07900 - Joint Sealers.
1.3 REFERENCES
NOTE ** Delete references from the list below that are not actually required by the text of the edited section.
A. ASTM A 240/A 240M - Standard Specification for Heat Resisting Chromium and Chromium-Nickel Steel Plate, Sheet, and Strip for Pressure Vessels.
B. ASTM A 308 - Standard Specification for Sheet, Terne (Lead-Tin Alloy) Coated by the Hot-Dip Process.
C. 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.
D. SMACNA - Architectural Sheet Metal Manual; Sheet Metal and Air Conditioning Contractors National Association, Inc.; fifth edition, 1993.
1.4 SUBMITTALS
A. Submit in accordance with Section 01300.
B. Product Data: Submit manufacturer's technical product data, installation instructions and general recommendations for each specified sheet material and fabricated product.
C. Samples: 12 inch square samples of specified sheet materials to be exposed as finished surfaces.
D. Samples: 12 inch long samples of factory-fabricated products exposed as finished work, including specified factory finish.
E. Shop Drawings: Submit layout, profiles, methods of joining, and anchorage details, including major counterflashings, trim/fascia units, gutters, downspouts, scuppers, and expansion joint systems. Provide layouts at 1/4 inch scale and details at 3 inch scale.
1.5 QUALITY ASSURANCE
A. Installer Qualifications: A firm with 5 years of successful experience with installation of stainless steel flashing and trim similar in type and scope to project requirements.
PART 2 PRODUCTS
2.1 FLASHING AND TRIM MATERIALS
NOTE ** Select one of the following stainless steel types below: either uncoated stainless steel or terne-coated stainless steel.
A. Stainless Steel Sheet: 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.
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: 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. 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.
D. Fasteners: Stainless steel, type 300 series, as recommended by sheet manufacturer.
E. Metal Accessories: Stainless steel clips, straps, anchoring devices, and similar accessory units as required for installation of work, non-corrosive, size and gage required for performance.
F. Bituminous Coating: SSPC-Paint 12, solvent-type bituminous mastic, nominally free of sulfur, 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.
G. Mastic Sealant: Polyisobutylene; non-hardening, non-skinning, non-drying, non-migrating sealant.
H. Elastomeric Sealant: Type recommended for components being sealed and complying with requirements for joint sealants as specified in Section 07900 - Joint Sealers.
I. Epoxy Seam Sealer: 2-part non-corrosive metal seam cementing compound, recommended by sealant manufacturer for exterior/interior non-moving joints including riveted joints.
J. Adhesives: Type recommended for waterproof and weather resistant seaming and adhesive application indicated by manufacturer of stainless steel.
2.2 ACCESSORY MATERIALS
NOTE ** Delete any of the following accessory items that are not required for the project.
A. Roofing Felt: Asphalt or coal tar saturated felt weighing not less than 30 lb per 100 square feet.
B. Slip Sheet: 4-lb rosin-sized building paper.
C. Elastic Expansion Joints: Factory-fabricated units of size and profile indicated, with elastic sheet flashing forming the primary joint membrane in a supported bellows arrangement designed to be secured to both sides of expansion joints; underside of bellows insulated with adhesive applied, flexible, closed-cell rubber or plastic not less than 3/8 inch thick.
NOTE ** Delete one of the following two paragraphs.
1. Type: Plain sheet or encapsulated stainless steel flanged edges, for embedment in other construction or nailing to substrates, 4 inches minimum flange width.
2. Type: Stainless steel flanged edges, 3 to 4 inches wide, formed to profiles as indicated to fit curbs and designed for nailing to curb substrate. Provide thickness as indicated and in accordance with manufacturer=s standards and recommendations.
3. Looped Bellows Width: 5 to 6 inches, exclusive of flanges.
4. Complete with prefabricated corner units, intersection units and splicing materials.
5. Manufacturers: Provide products that comply with project requirements and are made by one of the following:
a. ____________.
b. ____________.
c. ____________.
D. Reglets: Units of type and profile indicated, compatible with stainless steel, non-corrosive.
E. Gutter Guards: Stainless steel mesh or fabricated units, hinged for cleaning, with selvaged edges and non-corrosive fasteners. Select materials for compatibility with gutters and downspouts.
F. Conductor-Head Guards: Bee-hive type stainless steel mesh or fabricated units, removable for cleaning, with selvaged edges and non-corrosive fasteners. Select materials for compatibility with gutters and downspouts.
G. Roofing Cement: ASTM D 2822, asphaltic.
2.3 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. Seams: Fabricate non-moving joints with flat-lock seams. Tin edges to be seamed, form seams, and solder. Rivet joints for additional strength where required.
F. 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 joints.
G. Sealant Joints: Where movable, non-expansion type joints are indicated or required for proper performance of work, form metal to provide for proper installation of elastomeric sealant, in compliance with SMACNA standard details.
H. Separations: Provide for separation of metal 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 work of this section with adjoining work for proper sequencing of each installation to ensure best possible weather resistance and durability of work and protection of materials and finishes.
3.2 INSTALLATION
A. Except as otherwise indicated, comply with manufacturer's installation instructions and recommendations and with SMACNA Architectural Sheet Metal Manual.
1. Anchor units of work securely in place by methods indicated, providing for thermal expansion of units; conceal fasteners where possible, and set units true to line and level as indicated.
2. Install work with laps, joints, and seams that will be permanently watertight and weatherproof.
B. Galvanic Action Protection: Isolate different metal types from each other to prevent galvanic action.
C. Underlayment: Where installation is to be directly on cementitious or wood substrate, install slip sheet over a course of roofing felt.
D. 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.
E. Bed flanges of work in a thick coat of bituminous roofing cement where required for waterproof performance.
F. Install reglets to receive counterflashing in manner and by methods indicated. Where shown in concrete, furnish reglets to trades of concrete work for installation. Where shown in masonry, furnish reglets to trades of masonry work for installation.
G. Install counterflashing in reglets, either by snap-in seal arrangement or by soldering in place for anchorage and filling reglet with mastic or elastomeric sealant, as indicated and depending on degree of sealant exposure.
H. Install elastic expansion joints in accordance with manufacturer's recommendations.
1. Where required, provide for movement at joints by forming loops or bellows in width of flashing.
2. Locate cover or filler strips at joints to facilitate complete drainage of water from flashing.
3. Seam adjacent flashing sheets with adhesive, seal and anchor edges in accordance with manufacturer's recommendations.
4. Nail flanges of expansion joint units to curb nailers, at maximum spacing of 6 inches on center.
5. Fabricate seams at joints between units with minimum 3 inch overlap, to form a continuous, waterproof system.
I. Install continuous gutter guards on gutters and conductor-head guards at conductor heads.
3.3 CLEANING AND PROTECTION
A. Clean exposed stainless steel surfaces, removing substances that might cause staining, corrosion, or deterioration of finish or that would interfere with uniform oxidation and weathering.
B. Protect flashings and sheet metal work during construction to ensure that work will be without damage or deterioration other than natural weathering at time of Substantial Completion.
