A. Demolition and Disposal of Existing Metal Roofing and T1-11 Type Siding 1) Contractor shall remove and dispose of existing metal roofing and associated components, including but not limited to panels, fasteners, flashings, and underlayment, in an environmentally responsible manner, recycling where feasible and in compliance with local waste disposal laws, codes, regulations, and ordinances. 2) Contractor shall remove and dispose of existing wood siding and associated trim in an environmentally responsible manner, recycling where feasible and ensuring compliance with local waste disposal laws, codes, regulations, and ordinances, while ensuring no damage to underlying structure and protecting adjacent areas. B. Replacement and Installation of New Roofing and Siding 1) Contractor shall ensure metal siding and roofing is installed according to Attachment 3, Site Plans and Specifications. 2) Contractor shall ensure installation adheres to the Metal Construction Association (MCA) guidelines and the Metal Roofing Alliance standards for quality and safety. 3) Contractor shall ensure metal is installed and fastened using manufacturer's recommendations. For metal roofing, this includes using corrosion-resistant fasteners (e.g., screws with neoprene washers) spaced per manufacturer specifications to allow for thermal expansion and contraction (approximately one-eighth inch (1/8”) per ten (10) feet per 100°F temperature change). 4) Contractor shall ensure panels are aligned to ensure watertight seams, with overlaps of at least six (6) inches for end laps and proper crimping or sealing at standing seams, if applicable. 5) Contractor shall ensure metal siding fasteners are installed at recommended intervals (e.g., 12-16 inches in the center), avoid over-tightening to prevent dimpling, and incorporates expansion joints or slots to accommodate movement. 6) Colors to be determined and confirmed by the CAL FIRE Project Representative prior to the procurement of materials. Contractor shall provide samples for approval if requested. 7) Contractor shall ensure all areas are to include a moisture barrier installed under metal. A high-temperature underlayment (e.g., synthetic or felt per American Society for Testing and Materials (ASTM) D226) shall be applied over the substrate, with overlaps of at least two (2) to four (4) inches, taped or sealed at seams, to provide a secondary water-resistant barrier. For roofing, self-adhered high-heat ice and water shield shall be used at valleys, eaves, and penetrations per International Building Code (IBC) requirements. 8) Contractor shall conform to all industry standards and manufacturer specifications. For metal roofing, this includes: a) Compliance with American Society of Civil Engineers (ASCE) 7, Minimum Design Loads and Associated Criteria for Buildings and Other Structures, for minimum design loads (wind, snow, seismic), b) Underwriters Laboratories (UL) 580, Standard for Safety Tests for Uplift Resistance of Roof Assemblies, c) Advancing Standards Transforming Markets (ASTM) A653, Standard Specification for Steel Sheet, ZincCoated (Galvanized) or Zinc-Iron Alloy Coated (Galvannealed) by the Hot-Dip Process. 9) Contractor shall ensure the roof slope is verified to meet minimum requirements (e.g. 3:12 for non-sealed systems or 1/4:12 for sealed standing seam). 10) Contractor shall ensure proper flashing (e.g., drip edges, valley flashings) is installed at all edges, transitions, and penetrations using compatible metals to prevent galvanic corrosion, sealed with butyl tape or approved sealants
