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SHEET METAL Section 07600 15-1207 underlying materials with clips, cleats or tabs (edge strips). Provide neoprene washers at all exposed fasteners. H. Make seams in direction of water flow to create a flashing and counter -flashing condition. I. Hem exposed edges of sheet metal work 1/2 inch or as otherwise shown. J. Do cutting, fitting, punching, etc., in sheet metal to accommodate work specified elsewhere and provide necessary accessory items. K. Properly apply caulking and sealants to sheet metal items to permit movement between surfaces and to make entire installation watertight. Conform to requirement of Joint Sealants Section. L. Soldering: Roughen smooth surfaces with clean emery cloth or sandpaper; do not use steel wool. Use torch or well heated irons. Solder slowly, thoroughly heating seams and completely sweating solder through full width with a least 1" of solder evenly flowed along seams. Wherever possible, solder in a flat position. Solder seams on slopes greater than 45 degrees a second time. Solder immediately after application of flux; after soldering, immediately neutralize any corrosive flux with 5% soda solution and flush with clean water. Soldering of exposed surfaces shall be neatly done. Exposed solder shall be dressed and finished. Soldering shall be employed only to seal or fill seams. Where structural strength is required, do not rely on solder alone but use supplementary mechanical fasteners. M. Cut edges or joints and abrasions which expose base metal of galvanized sheet metal shall be coated with solder to equivalent thickness of zinc coating before assembling or installing sheet metal items. N. Priming Surfaces: 1. Coat all metal surfaces in contact with single ply or built-up roofing with primer or sealant as recommended by the roofing manufacturer. O. Provide isolation of dissimilar metals from contact with each other by coating with asphalt primer. P. Finish all sheet metal work straight and true, with miters and joints accurately fitted. Exposed work shall be free of dents. All corners shall be reinforced, and seams soldered or otherwise made waterproof. Exposed edges shall be hemmed. Q. All work shall be made watertight and leak proof. Except where provision is required for expansion and contraction, all joints and seams shall be locked, or otherwise made mechanically strong. Solder may be used, where appropriate, to make joints and seams watertight, but shall not be considered as providing mechanical strength. R. Fabricate sheet metal work from materials and of gauges indicated or specified. Where material is not indicated, fabricate from galvanized sheet metal not less than 24 gauge. 1. Cleats supporting bottom edges of sheet metal work shall be continuous; secure on not more than 24 inch centers. Provide cleats at all free edges of flashing and as indicated on Drawings.