INSTALLATION A. General: Install roof accessories according to manufacturer's written instructions. B. 1. Install roof accessories level, plumb, true to line and elevation, and without warping, jogs in alignment, excessive oil canning, buckling, or tool marks. 2. Anchor roof accessories securely in place so they are capable of resisting indicated loads. 3. Use fasteners, separators, sealants, and other miscellaneous items as required to complete installation of roof accessories and fit them to substrates. 4. Install roof accessories to resist exposure to weather without failing, rattling, leaking, or loosening of fasteners and seals. Metal Protection: Protect metals against galvanic action by separating dissimilar metals from contact with each other or with corrosive substrates by painting contact surfaces with bituminous coating or by other permanent separation as recommended by manufacturer. 1. Coat concealed side of uncoated aluminum roof accessories with bituminous coating where in contact with wood, ferrous metal, or cementitious construction. 2. Underlayment: Where installing roof accessories directly on cementitious or wood substrates, install a course of felt underlayment and cover with a slip sheet, or install a 3. Bed flanges in thick coat of asphalt roofing cement where required by manufacturers of roof accessories for waterproof performance. C. Roof-Hatch Installation: 1. Install roof hatch so top surface of hatch curb is level. 2. Verify that roof hatch operates properly. Clean, lubricate, and adjust operating mechanism and hardware. 3. Attach safety railing system to roof-hateh curb. 4. Attach ladder-assist post according to manufacturer's written instructions. D. Seal joints with elastomeric sealant as required by roof accessory manufacturer. 3.3 REPAIR AND CLEANING A. Galvanized Surfaces: Clean field welds, bolted connections, and abraded areas and repair galvanizing according to ASTM A 780. B. Touch up factory-primed surfaces with compatible primer ready for field painting according to Section 09 91 13 "Exterior Painting" C. Clean exposed surfaces according to manufacturer's written instructions. D. Clean off excess sealants. E. Replace roof accessories that have been damaged or that cannot be successfully repaired by finish touchup or similar minor repair procedures.
