Loading...
HomeMy WebLinkAbout07 61 00.DOCMATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 07 61 00 - CARMEL CITY CENTER Date 03.26.12 SHEET METAL ROOFING MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 SECTION 07 61 00 - SHEET METAL ROOFING PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section includes custom-fabricated, standing-seam sheet metal roofing. B. Related Requirements: 1. Section 07 71 00 "Roof Specialties" for manufactured fasciae and copings that are not part of sheet metal roofing. 2. Section 07 92 00 "Joint Sealants" for field-applied sealants adjoining sheet metal roofing. 1.3 COORDINATION A. Coordinate sheet metal roofing layout and seams with sizes and locations of roof curbs, equipment supports, equipment provided, and roof penetrations. B. Coordinate sheet metal roofing installation with rain drainage work, flashing, trim, and construction of roofing substrate, parapets, walls, and other adjoining work to provide leak- proof, secure, and noncorrosive installation. 1.4 PRE-INSTALLATION MEETINGS A. Pre-installation Conference: Conduct conference at Project site. 1. Review construction schedule. Verify availability of materials, Installer's personnel, equipment, and facilities needed to make progress and avoid delays. 2. Review structural loading limitations of substrates during and after roofing installation. 3. Review flashings, special roofing details, roof drainage, roof penetrations, equipment curbs, and condition of other construction that affect sheet metal roofing. 4. Review requirements for insurance and certificates if applicable. 5. Review roof observation and repair procedures after sheet metal roofing installation. 1.5 ACTION SUBMITTALS A. Product Data: For each type of product. 1. Include construction details, material descriptions, dimensions of individual components and profiles, and finishes for each manufactured product and accessory. B. Shop Drawings: For sheet metal roofing. 1. Include plans, elevations, sections, and attachment details. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 07 61 00 - CARMEL CITY CENTER Date 03.26.12 SHEET METAL ROOFING MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 2. Detail fabrication and installation layouts, expansion joint locations, fixed points, and keyed details. Distinguish between shop- and field-assembled work. 3. Include details for forming, including seams and dimensions. 4. Include details for joining and securing, including layout and spacing of fasteners, cleats, and other attachments. Include pattern of seams. 5. Include details of termination points and assemblies. 6. Include details of expansion joints, including showing direction of expansion and contraction from fixed points. 7. Include details of roof penetrations. 8. Include details of edge conditions, including eaves, ridges, valleys, rakes, crickets, and counterflashings. 9. Include details of special conditions. 10. Include details of connections to adjoining work. 11. Detail the following accessory items, at scale of not less than 1-1/2 inches per 12 inches: a. Flashing and trim. b. Gutters and downspouts as they relate to adjacent sheet metal roofing. c. Roof curbs. C. Samples for Initial Selection: For each type of sheet metal with factory-applied finishes. 1. Include Samples of trim and accessories involving finish or color selection. D. Samples for Verification: For each type of exposed finish. 1. Sheet Metal Roofing: 12 inches long by actual width of unit, including finished seam and in required profile. Include fasteners and other attachments. 2. Trim and Metal Closures: 12 inches long and in required profile. Include fasteners and other exposed accessories. 1.6 INFORMATIONAL SUBMITTALS A. Coordination Drawings: Roof plans, drawn to scale, on which the following items are shown and coordinated with each other, using input from installers of the items involved: 1. Sheet metal roofing, seam locations, and attachments. 2. Details for penetrations. B. Qualification Data: For Installer and fabricator. C. Product Test Reports: For each product, for tests performed by a qualified testing agency. D. Sample Warranties: For special warranties. 1.7 CLOSEOUT SUBMITTALS A. Maintenance Data: For roofing sheet metals and accessories to include in maintenance manuals. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 07 61 00 - CARMEL CITY CENTER Date 03.26.12 SHEET METAL ROOFING MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 1.8 QUALITY ASSURANCE A. Sheet Metal Roofing Fabricator Qualifications: Employs skilled workers who custom fabricate sheet metal roofing similar to that required for this Project and whose products have a record of successful in-service performance. B. Mockups: Build mockups only as requested in writing by Architect. 1. Build mockup of typical roof area and eave as shown on Drawings, including, underlayment, attachments, and accessories. 2. Approval of mockups does not constitute approval of deviations from the Contract Documents contained in mockups unless Architect specifically approves such deviations in writing. 3. Subject to compliance with requirements, approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion. 1.9 DELIVERY, STORAGE, AND HANDLING A. Do not store sheet metal roofing materials in contact with other materials that might cause staining, denting, or other surface damage. Store sheet metal roofing materials away from uncured concrete and masonry. B. Protect strippable protective covering on sheet metal roofing from exposure to sunlight and high humidity, except to extent necessary for period of sheet metal roofing installation. 1.10 WARRANTY A. Special Warranty: Warranty form at end of this Section in which Installer agrees to repair or replace components of sheet metal roofing that fail in materials or workmanship within specified warranty period. 1. Failures include, but are not limited to, the following: a. Structural failures including, but not limited to, rupturing, cracking, or puncturing. b. Wrinkling or buckling. c. Loose parts. d. Failure to remain weather tight, including uncontrolled water leakage. e. Deterioration of metals, metal finishes, and other materials beyond normal weathering, including non-uniformity of color or finish. f. Galvanic action between sheet metal roofing and dissimilar materials. 2. Warranty Period: Two years from date of Substantial Completion. B. Special Warranty on Finishes: Manufacturer agrees to repair finish or replace sheet metal roofing that shows evidence of deterioration of factory-applied finishes within specified warranty period. 1. Exposed Panel Finish: Deterioration includes, but is not limited to, the following: a. Color fading more than 5 Hunter units when tested according to ASTM D 2244. b. Chalking in excess of a No. 8 rating when tested according to ASTM D 4214. c. Cracking, checking, peeling, or failure of paint to adhere to bare metal. 2. Finish Warranty Period: 20 years from date of Substantial Completion. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 07 61 00 - CARMEL CITY CENTER Date 03.26.12 SHEET METAL ROOFING MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 PART 2 - PRODUCTS 2.1 PERFORMANCE REQUIREMENTS A. General Performance: Sheet metal roofing system including, but not limited to, metal roof panels, cleats, anchors and fasteners, sheet metal flashing integral with sheet metal roofing, fascia panels, trim, underlayment, and accessories, shall comply with requirements without failure due to defective manufacture, fabrication, or installation, or due to other defects in construction. Sheet metal roofing shall remain watertight. B. Sheet Metal Roofing Standard: Comply with SMACNA's "Architectural Sheet Metal Manual" unless more stringent requirements are specified or indicated on Drawings. C. Energy Performance: Provide sheet metal roofing according to one of the following when tested according to CRRC-1: 1. Three-year, aged, solar reflectance of not less than 0.55 and emissivity of not less than 0.75. D. Thermal Movements: Allow for thermal movements from ambient and surface temperature changes to prevent buckling, opening of joints, overstressing of components, failure of joint sealants, failure of connections, and other detrimental effects. 1. Temperature Change: 120 deg F, ambient; 180 deg F, material surfaces. 2.2 ROOFING SHEET METALS A. General: Protect mechanical and other finishes on exposed surfaces from damage by applying strippable, temporary protective film before shipping. B. Metallic-Coated Steel Sheet: Provide zinc-coated (galvanized) steel sheet according to ASTM A 653, G90 coating designation or aluminum-zinc alloy-coated steel sheet according to ASTM A 792, Class AZ50 coating designation,Grade 40; with smooth, flat surface; pre-painted by coil-coating process to comply with ASTM A 75. 1. Thickness: Nominal 0.022 inch unless otherwise indicated. 2. Exposed Coil-Coated Finish: a. Two-Coat Fluoropolymer: AAMA 621. Fluoropolymer finish containing not less than 70 percent PVDF resin by weight in color coat. Prepare, pretreat, and apply coating to exposed metal surfaces to comply with coating and resin manufacturers' written instructions. 3. Color: As selected by Architect from manufacturer's full range. 4. Concealed Finish: Pretreat with manufacturer's standard white or light-colored acrylic or polyester-backer finish, consisting of prime coat and wash coat with minimum total dry film thickness of 0.5 mil. 2.3 UNDERLAYMENT MATERIALS A. Self-Adhering, High-Temperature Sheet: Minimum 30 mils thick, consisting of a slip-resistant polyethylene- or polypropylene-film top surface laminated to a layer of butyl- or SBS-modified asphalt adhesive, with release-paper backing; specifically designed to withstand high metal temperatures beneath metal roofing. Provide primer according to written recommendations of underlayment manufacturer. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 07 61 00 - CARMEL CITY CENTER Date 03.26.12 SHEET METAL ROOFING MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 1. Products: Subject to compliance with requirements, provide one of the following: a. Carlisle Residential, a division of Carlisle Construction Materials; WIP 300HT. b. Grace Construction Products, a unit of W. R. Grace & Co.-Conn.; Grace Ice and Water Shield HT. c. Henry Company; Blueskin PE200 HT. d. Metal-Fab Manufacturing, LLC; MetShield. e. Owens Corning; WeatherLock Specialty Tile & Metal Underlayment. 2. Thermal Stability: ASTM D 1970; stable after testing at 240 deg F or higher. 3. Low-Temperature Flexibility: ASTM D 1970; passes after testing at minus 20 deg F or lower. 2.4 MISCELLANEOUS MATERIALS A. General: Provide materials and types of fasteners, protective coatings, sealants, and other miscellaneous items as required for complete roofing system and as recommended by primary sheet metal manufacturer unless otherwise indicated. B. Fasteners: Wood screws, annular-threaded nails, self-tapping screws, self-locking rivets and bolts, and other suitable fasteners designed to withstand design loads. 1. General: a. Exposed Fasteners: Heads matching color of sheet metal roofing using plastic caps or factory-applied coating. Provide metal-backed EPDM or PVC sealing washers under heads of exposed fasteners bearing on weather side of roofing. b. Fasteners for Flashing and Trim: Blind fasteners or self-drilling screws, gasketed; with hex-washer head. c. Blind Fasteners: High-strength aluminum or stainless-steel rivets suitable for metal being fastened. 2. Fasteners for Zinc-Coated (Galvanized) or Aluminum-Zinc Alloy-Coated Steel Sheet: Series 300 stainless steel or hot-dip galvanized steel according to ASTM A 153/A 153M or ASTM F 2329. C. Elastomeric Sealant: ASTM C 920, elastomeric polyurethane or silicone polymer sealant; of type, grade, class, and use classifications required to seal joints in sheet metal roofing and remain watertight. D. Butyl Sealant: ASTM C 1311, single-component, solvent-release butyl rubber sealant; poly- isobutylene plasticized; heavy bodied for hooked-type expansion joints with limited movement. E. Bituminous Coating: Cold-applied asphalt emulsion according to ASTM D 1187. 2.5 ACCESSORIES A. Sheet Metal Accessories: Provide components required for complete sheet metal roofing assembly including trim, copings, fasciae, corner units, clips, flashings, sealants, gaskets, fillers, metal closures, closure strips, and similar items. Match material and finish of sheet metal roofing unless otherwise indicated. 1. Cleats: Intermittent and continuous attachment devices for mechanically seaming into joints and formed from the following materials and thicknesses unless otherwise indicated: a. Metallic-Coated Steel Roofing: 0.0250-inch- thick stainless steel. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 07 61 00 - CARMEL CITY CENTER Date 03.26.12 SHEET METAL ROOFING MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 2. Expansion-Type Cleats: Cleats of a design that allows longitudinal movement of roof panels without stressing panel seams; of same material as other cleats. 3. Backing Plates: Plates at roofing splices, fabricated from material recommended by SMACNA. 4. Closure Strips: Closed-cell, expanded, cellular, rubber or cross-linked, polyolefin foam or closed-cell laminated polyethylene; minimum 1-inch- thick, flexible-closure strips; cut or pre-molded to match sheet metal roofing profile. Provide closure strips where necessary to ensure weather tight construction. 5. Flashing and Trim: Formed from same material and with same finish as sheet metal roofing, minimum 0.018 inch thick. 2.6 FABRICATION A. General: Custom fabricate sheet metal roofing to comply with details shown and recommendations in SMACNA's "Architectural Sheet Metal Manual" that apply to design, dimensions (panel width and seam height), geometry, metal thickness, and other characteristics of installation. Fabricate sheet metal roofing and accessories in shop to greatest extent possible. 1. Standing-Seam Roofing: Form standing-seam panels with finished seam height of 1 inch. B. Fabrication Tolerances: Fabricate sheet metal roofing that is capable of installation to a tolerance of 1/4 inch in 20 feet on slope and location lines indicated on Drawings and within 1/8- inch offset of adjoining faces and of alignment of matching profiles. C. Form exposed sheet metal work to fit substrates with little oil canning; free of buckling and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems. 1. Lay out sheet metal roofing so transverse seams, if required, are made in direction of flow with higher panels overlapping lower panels. 2. Offset transverse seams from each other 12 inches minimum. 3. Fold and cleat eaves and transverse seams in shop. 4. Form and fabricate sheets, seams, strips, cleats, valleys, ridges, edge treatments, integral flashings, and other components of metal roofing to profiles, patterns, and drainage arrangements indicated on Drawings and as required for leakproof construction. D. Expansion Provisions: Fabricate sheet metal roofing to allow for expansion in running work sufficient to prevent leakage, damage, and deterioration of the Work. 1. Form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with butyl sealant concealed within joints. 2. Use lapped expansion joints only where indicated on Drawings. E. Sealant Joints: Where movable, non-expansion-type joints are required, form metal to provide for proper installation of elastomeric sealant according to SMACNA standards. F. Sheet Metal Accessories: Custom fabricate flashings and trim to comply with recommendations in SMACNA's "Architectural Sheet Metal Manual" that apply to design, dimensions, metal, and other characteristics of item required. Obtain field measurements for accurate fit before shop fabrication. 1. Form exposed sheet metal accessories without excessive oil canning, buckling, and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 07 61 00 - CARMEL CITY CENTER Date 03.26.12 SHEET METAL ROOFING MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 2. Seams: Fabricate nonmoving seams with flat-lock seams. Form seams and seal with elastomeric sealant unless otherwise recommended by sealant manufacturer for intended use. 3. Sealed Joints: Form non-expansion, but movable, joints in metal to accommodate elastomeric sealant. 4. Conceal fasteners and expansion provisions where possible. Do not use exposed fasteners on faces of accessories exposed to view. 5. Fabricate cleats and attachment devices of sizes recommended by SMACNA's "Architectural Sheet Metal Manual" for application, but not less than thickness of metal being secured. G. Do not use graphite pencils to mark metal surfaces. PART 3 - EXECUTION 3.1 EXAMINATION A. Examine substrates, areas, and conditions, with Installer present, for compliance with requirements for installation tolerances, substrate, and other conditions affecting performance of the Work. 1. Examine solid roof sheathing to verify that sheathing joints are supported by framing or blocking, that tops of fasteners are flush with surface, and that installation is within flatness tolerances required for finished roofing installation. 2. Verify that substrate is sound, dry, smooth, clean, sloped for drainage, and completely anchored, and that provision has been made for drainage, flashings, and penetrations through sheet metal roofing. 3. Verify that air- or water-resistant barriers have been installed over sheathing or backing substrate to prevent air infiltration or water penetration. B. Prepare written report, endorsed by Installer, listing conditions detrimental to performance of the Work. C. Proceed with installation only after unsatisfactory conditions have been corrected. 3.2 PREPARATION A. Lay out panel arrangement before installation of sheet metal roofing. 1. Space fasteners not more than 18 inches o.c. 3.3 UNDERLAYMENT INSTALLATION A. Self-Adhering Sheet Underlayment: Install self-adhering sheet underlayment, wrinkle free. Prime substrate if recommended by underlayment manufacturer. Comply with temperature restrictions of underlayment manufacturer for installation; use primer for installing underlayment at low temperatures. Apply in shingle fashion to shed water, with end laps of not less than 6 inches staggered 24 inches between courses. Overlap side edges not less than 3-1/2 inches. Roll laps and edges with roller. Cover underlayment within 14 days. 1. Apply self-adhering sheet underlayment over entire roof. 2. Roof perimeter for a distance up from eaves of 24 inches beyond interior wall line. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 07 61 00 - CARMEL CITY CENTER Date 03.26.12 SHEET METAL ROOFING MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 3. Valleys, from lowest to highest point, for a distance on each side of 18 inches. 4. Rake edges for a distance of 18 inches. 5. Hips and ridges for a distance on each side of 12 inches. 6. Roof-to-wall intersections for a distance from wall of 18 inches. 7. Around dormers, chimneys, skylights, and other penetrating elements for a distance from element of 18 inches. B. Install flashings to cover underlayment according to requirements in Section 07 62 00 "Sheet Metal Flashing and Trim." 3.4 INSTALLATION, GENERAL A. General: Install sheet metal roofing to comply with details shown and recommendations in SMACNA's "Architectural Sheet Metal Manual" that apply to installation characteristics required unless otherwise indicated on Drawings. Install fasteners, protective coatings, separators, sealants, and other miscellaneous items as required for complete roofing system and as recommended by fabricator for sheet metal roofing. 1. Install sheet metal roofing true to line, levels, and slopes. Provide uniform, neat seams with minimum exposure of solder, welds, and sealant. 2. Anchor sheet metal roofing and other components of the Work securely in place, with provisions for thermal and structural movement. 3. Field cutting of sheet metal roofing by torch is not permitted. 4. Provide metal closures at peaks rake edges rake walls eaves and each side of ridge and hip caps. 5. Flash and seal sheet metal roofing with closure strips at eaves, rakes, and perimeter of all openings. Fasten with self-tapping screws. 6. Locate and space fastenings in uniform vertical and horizontal alignment. Predrill panels for fasteners. 7. Install ridge caps as sheet metal roofing work proceeds. 8. Locate roofing splices over, but not attached to, structural supports. Stagger roofing splices and end laps to avoid four-panel lap splice condition. Install backing plates at roofing splices. 9. Lap metal flashing over sheet metal roofing to direct moisture to run over and off roofing. 10. Do not use graphite pencils to mark metal surfaces. B. Thermal Movement: Rigidly fasten metal roof panels to structure at only one location for each panel. Allow remainder of panel to move freely for thermal expansion and contraction. 1. Point of Fixity: Fasten each panel along single line of fixing located at locations indicated on Drawings. 2. Avoid attaching accessories through roof panels in manner that inhibits thermal movement. C. Fasteners: Use fastener sizes that penetrate substrate not less than recommended by fastener manufacturer to achieve maximum pull-out resistance. D. Metal Protection: Where dissimilar metals contact each other, or where metal contacts pressure-treated wood or other corrosive substrates, protect against galvanic action or corrosion by painting contact surfaces with bituminous coating, by applying self-adhering sheet underlayment to each contact surface, or by other permanent separation as recommended by sheet metal manufacturer or SMACNA. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 07 61 00 - CARMEL CITY CENTER Date 03.26.12 SHEET METAL ROOFING MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 1. Coat concealed side of uncoated-aluminum and stainless-steel sheet metal roofing with bituminous coating where roofing contacts wood, ferrous metal, or cementitious construction. E. Conceal fasteners and expansion provisions where possible in exposed work and locate to minimize possibility of leakage. Cover and seal fasteners and anchors as required for a tight installation. F. Fasciae: Align bottom of sheet metal roofing and fasten with blind rivets, bolts, or self-tapping screws. Flash and seal sheet metal roofing with closure strips where fasciae meet soffits, along lower panel edges, and at perimeter of all openings. 3.5 CUSTOM-FABRICATED SHEET METAL ROOFING INSTALLATION A. Fabricate and install work with lines and corners of exposed units true and accurate. Form exposed faces flat and free of buckles, excessive waves, and avoidable tool marks, considering metal temper and reflectivity. Provide uniform, neat seams with minimum exposure of solder, welds, and sealant. Fold back sheet metal to form hem on concealed side of exposed edges unless otherwise indicated. 1. Install cleats to hold sheet metal panels in position. Attach each cleat with at least two fasteners to prevent rotation. 2. Space cleats not more than 12 inches o.c. Bend tabs over fastener head. 3. Provide expansion-type cleats for roof panels that exceed 30 feet in length. B. Seal joints as required for watertight construction. For roofing with 3:12 slopes or less, use cleats at transverse seams. 1. Use sealant-filled joints unless otherwise indicated. Embed hooked flanges of joint members not less than 1 inch (25 mm) into sealant. Form joints to completely conceal sealant. When ambient temperature at time of installation is between 40 and 70 deg F, set joint members for 50 percent movement each way. Adjust setting proportionately for installation at higher ambient temperatures. Do not install sealant-type joints at temperatures below 40 deg F. 2. Prepare joints and apply sealants to comply with requirements in Section 079200 "Joint Sealants." C. Standing-Seam Roofing: Attach standing-seam metal panels to substrate with double-fastened cleats spaced at 12 inches o.c. Install panels reaching from eave to ridge before moving to adjacent panels. Before panels are interlocked, apply continuous bead of sealant to top of flange of lower panel. Lock standing seams by folding over twice so cleat and panel edges are completely engaged. 1. Lock each panel to panel below with sealed transverse seam. 2. Loose-lock panels at eave edges to continuous edge flashing exposed 24 inches from roof edge. Attach edge flashing to face of roof edge with continuous cleat fastened to roof substrate at 12-inch o.c. spacing. Lock panels to edge flashing. 3. Fold over seams after locking at ridges and hips. D. Field Painting: Paint exposed surfaces of zinc-tin alloy-coated steel with one coat of zinc-tin alloy-coated steel primer and one coat of zinc-tin alloy-coated steel finish coat as soon as possible after installation; apply each coat at dry film thickness of not less than 2.5 mils . Comply with manufacturer's written instructions. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 07 61 00 - CARMEL CITY CENTER Date 03.26.12 SHEET METAL ROOFING MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 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 complete sheet metal roofing assembly including trim, copings, seam covers, flashings, sealants, gaskets, fillers, metal closures, closure strips, and similar items. 2. Install accessories integral to sheet metal roofing that are specified in Section 07 62 00 "Sheet Metal Flashing and Trim" to comply with that Section's requirements. 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 install units true to line, levels, and slopes. Install work with laps, joints, and seams that are permanently watertight and weather resistant. 1. Install 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. 2. Install continuous strip of self-adhering underlayment at edge of continuous flashing overlapping self-adhering underlayment, where "continuous seal strip" is indicated in SMACNA's "Architectural Sheet Metal Manual" and on Drawings. 3. Install exposed flashing and trim without excessive oil canning, buckling, and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems. Install sheet metal flashing and trim to fit substrates, and to result in waterproof and weather- resistant performance. 4. Expansion Provisions: Provide for thermal expansion of exposed flashing and trim. Space movement joints at maximum of 10 feet with no joints within 24 inches of corner or intersection. a. Form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, and filled with butyl sealant concealed within joints. b. Use lapped expansion joints only where indicated on Drawings. 3.7 ERECTION TOLERANCES A. Installation Tolerances: Shim and align sheet metal roofing within installed tolerance of 1/4 inch in 20 feet on slope and location lines indicated on Drawings and within 1/8-inch offset of adjoining faces and of alignment of matching profiles. B. Installation Tolerances: Shim and align sheet metal roofing within installed tolerances specified in MCA's "Guide Specification for Residential Metal Roofing." 3.8 CLEANING AND PROTECTION A. Clean exposed metal surfaces of substances that interfere with uniform oxidation and weathering. B. Clean and neutralize flux materials. Clean off excess solder. C. Clean off excess sealants. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 07 61 00 - CARMEL CITY CENTER Date 03.26.12 SHEET METAL ROOFING MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 D. Remove temporary protective coverings and strippable films as sheet metal roofing is installed unless otherwise indicated in manufacturer's written installation instructions. On completion of sheet metal roofing installation, clean finished surfaces as recommended by sheet metal roofing manufacturer. Maintain sheet metal roofing in clean condition during construction. E. Replace sheet metal roofing components that have been damaged or have deteriorated beyond successful repair by finish touchup or similar minor repair procedures. END OF SECTION 07 61 00