PART 1 GENERAL 1.01 SUMMARY A. Section Includes: Sheet metal roofing panels, metal trim, accessories, fasteners, closures, and sealants. [Specifier Note: Edit paragraph below to suit project requirements.] B. Related Sections: 1. Section 05120 Structural Steel 2. Section 05310 Steel Deck 3. Section 05400 Cold-Formed Metal Framing 4. Section 06150 Wood Decking 5. Section 07210 Building Insulation 6. Section 07220 Roof and Deck Insulation 7. Section 07260 Vapor Retarders 8. Section 07410 Metal Roof and Wall Panels 9. Section 07620 Sheet Metal Flashing and Trim 10. Section 07920 Joint Sealants 11. Section 13120 Pre-engineered Structures 1.02 REFERENCES A. General: Reference latest edition of applicable codes and standards. B. American Society for Testing and Materials (ASTM): 1. ASTM A792/A792M-Standard Specification for Steel Sheet, 55% Aluminum-Zinc-Alloy-Coated by the Hot-Dip Process. 2. ASTM E1592-Standard Test Method for Structural Performance of Sheet Metal Roof and Siding Systems by Uniform Static Air Pressure Difference. 3. ASTM E1646-Standard Test Method for Water Penetration of Exterior Metal Roof Panel Systems by Uniform Static Air Pressure Difference. 4. ASTM E1680-Standard Test Method for Rate of Air Leakage through Exterior Metal Roof Panel Systems C. AISI Cold-Formed Steel Design Manual, American Iron and Steel Institute (AISI). D. AISC Manual of Steel Construction, American Institute of Steel Construction (AISC). E. UL Roofing Materials Directory, Underwriters Laboratories, Inc. (UL). 1. UL Standard 580-Tests for Uplift Resistance of Roof Assemblies. [Specifier Note: Edit paragraphs below to suit project requirements]
F. FM Approval Guide, Factory Mutual Research Corporation (FM). 1. FM Approval Standard 4471 for Class 1 Panel Roofs. G. Building Codes and Design Standards: 1. ASCE-7, Minimum Design Loads for Buildings and Other Structures, American Society of Civil Engineers (ASCE). 2. BOCA National Building Code, Building Officials and Code Administrators, International (BOCA). 3. Uniform Building Code (UBC), International Conference of Building Code Officials (ICBO). 4. Standard Building Code (SBC), Southern Building Code Congress International (SBCC). 5. International Building Code (IBC), International Code Council (ICC). 1.03 SYSTEM DESCRIPTION A. Design Requirements: 1. Provide structural standing seam metal roof system with a min. 2" high "vertical" seam side joint, mechanically seamed, with factory applied sealant. 2. Attach roof panels to support substrate with concealed anchor clips designed to allow for thermal movement of the panels. There shall be no exposed fasteners except at panel fixing line and flashing details or as indicated on approved panel drawings. 3. Roll-forming of the panels at the job site must be performed with manufacturer owned and relocatable industrial type roll-forming mill having a minimum of (12) stands to gradually shape the sheet metal. Installer owned or rented roll-formers are not acceptable. 4. Provide metal roof panel system which has been manufactured and installed to withstand specified design loads and maintains performance requirements without defects, damage, or failure. B. Performance Requirements: [Specifier Note: Edit Paragraphs below to suit project requirements.] 1. Design Loads: Design loads shall be as specified below or as indicated on the contract drawings. a. The structural standing seam metal roof system shall be designed to safely resist the positive and negative wind loads as specified below or as indicated on the contract drawings: Roof Area (+) Wind (-) Wind Main Roof psf psf Ridge psf psf Eave psf psf Rake psf psf Corners psf psf
b. The structural standing seam metal roof system shall be designed to safely resist a psf roof live load. c. The structural standing seam metal roof system shall be designed to safely resist a psf roof snow load. Unbalanced roof snow loads and snow drifts shall be determined in accordance with [Specify building code or design standard]. 2. Deflection Criteria: Roof panel deflection shall be limited to L/240 for positive loading. 3. Roof panels shall be free to move in response to the expansion and contraction forces resulting from a total temperature range of degrees F during the life of the structure. 4. Roof systems that incorporate foam plastic insulation must be tested by the foam plastic manufacturer in accordance with NFPA-285. C. Performance Testing: Tests shall have been conducted or witnessed by a recognized independent laboratory or independent professional engineer. 1. Allowable uniform uplift load capacity shall be determined in accordance with ASTM E1592. a. The factor of safety against ultimate failure of panel, batten, or clip shall be 1.65, with no increase due to wind. b. Allowable uplift capacity for conditions of gage, span, or loading other than those tested may be determined by interpolation of the test results. Extrapolation of conditions outside the range of the tests is not acceptable. 2. Roof panel system shall be tested for resistance to water penetration in accordance with ASTM E 1646, at a static pressure of 12.0 psf. There shall be no uncontrolled water penetration through the panel side joints. 3. Roof panel system shall be tested for resistance to air leakage in accordance with ASTM E1680, at a static air pressure of 12.0 psf. Air infiltration shall not exceed.02 cfm per sq ft of panel area. 4. Roof panel system shall be tested in accordance with UL Standard 580 and have a Class 90 rating. 5. Roof panels shall withstand a 300 lb concentrated load applied to mid-span between supports with no panel deformation, rib buckling, or panel side joint separation which will adversely affect the weather tightness of the system. 6. Roof panel system shall be tested in accordance with FM Approval Standard 4471 and achieve a windstorm classification of I-90. [Specifier Note: FM approval only applies to panel installation over open steel framing.]
1.04 SUBMITTALS A. Product Data: Submit manufacturer's product data sheet and/or product design and installation manual. B. Shop Drawings: Submit panel shop drawings consisting of design and erection drawings, finish specifications, and other data necessary to clearly describe design, materials, sizes, layouts, construction details, fasteners, and erection. Submit small scale layouts of panels and large scale details of edge conditions, joints, fastener and sealant placement, flashings, penetrations and curbs, and special details. Distinction must be made between factory and field assembled work. Drawings must be approved and field verification of all dimensions must occur prior to fabrication. C. Samples: 1. Panel: Two (2) required, Full panel width by 12" long. 2. Anchor Clips: Two (2) required. 3. Fasteners: Two (2) of each type with a statement of intended use. 4. Closure: One metal closure with foam insert. 5. Sealants: One (1) sample of each type, with a statement of intended use. D. Warranties: Submit manufacturer's applicable sample warranties of products. E. Quality Assurance Submittals: 1. Calculations: Submit structural design calculations certified by a registered professional engineer to verify load carrying capacity of the panel system. 2. Test Reports: Submit certified test reports showing that the roof system has been tested and conforms to the specified performance testing requirements. 3. Certificates: a. A written statement from the manufacturer certifying conformance with the specified manufacturer s qualifications listed in article1.05 QUALITY ASSURANCE. b. A written statement from the installer certifying conformance with the specified installer qualifications listed in article 1.05 QUALITY ASSURANCE. 1.05 QUALITY ASSURANCE A. Qualifications: 1. Manufacturers Qualifications: The manufacturer shall have had at least fifteen (15) years in architectural metal roofing design and installation. The manufacturer shall have a permanent, stationary, indoor, production facility.
2. Installer Qualifications: a. The installer shall have had a minimum of five (5) years experience in the installation of metal roofing. b. The installer shall be manufacturer certified. B. Pre-installation Meeting: Conduct pre-installation meeting to verify project requirements, substrate conditions, manufacturer's installation instructions, and manufacturer's warranty requirements. 1.06 DELIVERY, STORAGE, AND HANDLING A. Delivery: Material shall be delivered to the site in a dry and undamaged condition and unloaded per the manufacturers instructions. The installer shall inspect materials for damage and stains upon arrival at the site. B. Storage: Materials shall be stored out of contact with the ground in weather tight coverings to keep them dry per the manufacturer's recommendations. Storage accommodations shall provide good air circulation and protection from surface staining. C. Handling: Exercise care in unloading, storing, and handling of panels to prevent bending, warping, twisting, or surface damage. Follow manufacturer's recommendations for material handling. 1.07 WARRANTIES A. Manufacturer's Warranties 1. Material Warranty: The manufacturer shall warrant that the material furnished will remain free from defects in material and workmanship for a period of two (2) years from date of shipment. 2. Metal Substrate Warranty: The manufacturer shall warrant that the metal roof panel substrate will not rupture or perforate due to corrosion within a period of twenty (20) years from date of shipment. 3. Finish Warranty: The manufacturer shall warrant against fading, chalking, peeling, cracking, checking, chipping, or erosion to base metal of the roof panel paint finish for a period of twenty (20) years from date of shipment. [Specifier Note: If required choose from weather tight warranties listed below. Warranty period may extend up to twenty (20) years from date of substantial completion.] 4. Weather Tight Warranty: a. Side Joint Warranty: The manufacturer shall warrant against water penetration of the panel side joint for a period of years from date of substantial completion. Coverage shall be limited to material only. Liability shall be limited to material cost
only, with a maximum of $.10 per sq ft. OR b. Standard Warranty: The manufacturer shall warrant against water penetration of the metal roof panel system, including panel side joint and trim conditions for a period of years from date of substantial completion. During the first two (2) years of the warranty, the roofing contractor shall be liable for all such costs and expenses of repair, refinishing, or replacement of the roofing system as covered by the warranty. Coverage shall be limited to material and installation. Manufacturer's liability shall be limited to material value paid to the manufacturer. Erector's liability shall be limited to the dollar amount paid for erection. OR c. Premium Warranty: The manufacturer shall warrant against water penetration of the metal roof panel system, including panel side joint and trim conditions for a period of years from date of substantial completion. During the first two (2) years of the warranty, the roofing contractor shall be liable for all such costs and expenses of repair, refinishing, or replacement of the roofing system as covered by the warranty. Coverage shall be limited to material and installation. Liability shall be limited to repair of the metal panel roof system. PART 2 PRODUCTS 2.01 MANUFACTURERS A. The CENTRIA SDP 200 structural standing seam metal roof system as manufactured by CENTRIA, 1099 US Highway 421 South, Frankfort, KY 40601. B. Requests to use alternate systems must be submitted in writing at least ten (10) days prior to the bid date. Product data, samples, test reports, and required certificates shall be included for product review and approval. C. Being listed as a pre-qualified manufacturer does not release the manufacturer from providing complete and acceptable submittal requirements. 2.02 MATERIALS A. Metal Panels: SDP 200 structural standing seam panel as manufactured by CENTRIA. [Specifier Note: Choose panel width, gage, and pan type in section below.] 1. Fabricate metal panels from aluminum-zinc coated steel conforming to ASTM A792 Grade 50B with AZ50 coating when painted AZ50 coating when painted or AZ55 coating
when unpainted. Thickness shall be minimum [24 or 22] gage. 2. Panels shall be a min. of [18", or 16"] wide with a 2" vertical seam height. 3. Panels shall [have longitudinal stiffening ribs in the pan to minimize "oil canning" effect, or be flat in the pan with no minor ribs]. B. Concealed Anchor Panel Clips: Fasten metal roof panels to support substrate with concealed anchor clips eliminating all through fastener penetrations. [Specifier Note: Choose concealed anchor panel clip type in section below.] 1. Panel Clips shall be two piece floating clip with a 16ga base and 22ga top. Clip shall be design to accommodate a minimum of 3.5 inches of total thermal movement. Clip shall have a self-centering feature to assure movement capability in both directions. OR 2. Panel Clips shall be one piece fixed clip, 22ga. 2.03 FINISHES [Specifier Note: Choose from panel finishes and textures listed below.] A. Galvalume Plus: Aluminum-zinc coated steel conforming to ASTM A792, Grade 50B with AZ55 coating plus a thin acrylic coating applied to both sides. B. Paint Finishes: Coating systems shall have been tested in accordance with ASTM standard test methods for factory color finish. Exterior color shall be chosen from manufacturer's standard colors. OR 1. Polyvinylidene Fluoride (PVDF): Two-coat system consisting of a nominal 0.2 mil corrosion inhibitive primer on both sides with a 0.75 mil fluoropolymer exterior topcoat and 0.30 mil backer finish. OR 2. Silicone Modified Polyester (SMP): Two-coat system consisting of a nominal 0.2 mil primer on both sides with 0.80 exterior topcoat and 0.30 mil backer finish. C. Texture: Panel finish shall be [smooth or embossed per manufacturer's standard embossed pattern.]
2.04 ACCESSORIES A. Fasteners: Use only high quality fasteners as recommended or approved by the roof system manufacturer. Follow fastener manufacturer's recommendations for fastener installation. B. Closures: 1. Screws: Self-drilling screws shall be min. #12 diameter. Self-tapping screws shall be min. #14 diameter. a. Exposed self-drilling and self-tapping screws shall have a zinc die-cast head with neoprene washer or be 300 series stainless steel with neoprene washer. All exposed fasteners shall be painted to match panel color. b. Concealed screws shall be carbon steel with corrosion resistant coating or 300 series stainless steel as required. 2. Rivets: a. Structural bulbed rivets shall be min.3/16" diameter, standard dome head, aluminum rivet and mandrel, with a weather tight EPDM washer under the head. Min. 5/16" diameter, large flange head, aluminum rivet and mandrel, with a weather tight EPDM washer under the head is required at panel endlaps. b. Trim rivets shall be min. 5/32" diameter, stainless steel body and stem with open end or aluminum body and stem with closed end. c. Rivets shall be painted to match panel color. 1. Pre-cut profile closure shall be cut from cross-linked, closed-cell foam. 2. All foam closures shall be protected and supported by a formed metal closure manufactured from the same material, color, and finish as the roofing. C. Sealants: Use only high quality sealants as recommended or approved by the roof system manufacturer. Sealants must not contain oils, asbestos, or asphalts. 1. Non-Curing Butyl: One-part, non-skinning, non-drying, synthetic butyl elastomer. Used for metal-to-metal sealing or bedding of panel and flashing seams or joints. 2. Butyl Tape (Webbed Mastic): Extruded polymeric butyl tape, non-skinning and not easily displaced under compression. Used for critical sealing of panel ends, endlaps, penetrations, closures, and flashings.
3. Urethane: One-part moisture curing, gun grade polyurethane sealant. Used for sealing in all exposed conditions. Color to be coordinated with that of panel. 2.05 FLASHING A. All flashing shall be of the same material, gage, finish, color, and texture as the panels unless otherwise noted. B. Flashing design shall conform to details submitted and approved by the Architect and, if required, the panel manufacturer. 2.06 FABRICATION A. Where possible panels shall be manufactured in continuous lengths, full length of panel runs. PART 3 EXECUTION 3.01 EXAMINATION A. The installer shall inspect the building to verify that the structure is ready for roofing installation. 1. All supports shall be in place with all bracing and connections tightened before work proceeds. 2. Field-check dimensions and check support alignment with a taut string or wire; panel misalignment may induce "oil canning" and potentially restrict panel movement. a. Panel/purlin erection tolerances: * Maximum out-of-plane deviation shall be limited to +/-3/16" from control. * Maximum deviation of 1/8" between adjacent purlins or L/500 which ever is less. 3. Do not proceed until unsatisfactory conditions are corrected. 3.02 INSTALLATION A. Install metal roofing system in accordance with approved erection drawings and manufacturer's installation instructions. B. Install metal roofing system so that it is weather-tight, without waves, warps, buckles, fastening stress or distortion. C. Hand-crimp at end of panels and any panel end lap(s) prior to seaming. Do not hand-crimp at each panel clip prior to seaming. Do not walk on panels until panels are mechanically seamed together.
D. Seam panels together with electric powered seaming machine supplied by the manufacturer. E. Protect installed panels from abuse by other trades. The general contractor shall be responsible for protecting the roofing from wet cement, plaster, and paint operations. The installer shall provide walk boards in heavy traffic areas to prevent damage to the panels. 3.03 DAMAGED MATERIAL AND CLEANING A. Replace panels and other components of work which have been damaged beyond repair. B. To prevent rust staining, remove immediately from finished surfaces any filings caused by drilling or cutting. C. Wipe down each area after erection is complete for final acceptance.