Flashing thickness?

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Author Message David G. Axt, CCS, CSI ,SCIP Senior Member Username: david_axt Post Number: 1537 Registered: 03-2002 Posted on Monday, December 12, 2016 - 06:43 pm:    How is the gauge / thickness of metal flashing determined? SMACNA Architectural Sheet Metal Manual Table 1-1 indicates how to determine the thickness of metal gutters, but there is no mention of how to determine the thickness of other items (wall copings, gravel stops, valley flashing, wall reglets, etc.) David G. Axt, CCS, CSI, SCIP Specifications Consultant Axt Consulting LLC Ronald J. Ray, RA, CCS, CCCA, CSI, AIA Senior Member Username: rjray Post Number: 148 Registered: 04-2004 Posted on Monday, December 12, 2016 - 07:32 pm:    Since IBC requires sheet metal copings and roof edge systems to comply with ANSI/SPRI/FM 4435 ES-1, the thickness would be dependant on a manufacturer’s design. One might word a specification to read something like: “Thickness: As required to comply with ANSI/SPRI/FM 4435 ES-2, but not less than 0.??? inches.” For prefinished steel sheet metal, the most common thickness for uncoated steel sheet is 0.239 inch, and for galvanized coated steel sheet it is 0.0276. So, perhaps the ??? above would be one of these thicknesses. Naturally for aluminum, stainless steel, and copper, one would need to determine the minimum thickness one would accept. RH (Hank) Sweers II RA CSI CCS Senior Member Username: rhsweers2 Post Number: 17 Registered: 08-2005 Posted on Tuesday, December 13, 2016 - 05:55 pm:    My old '87 SMACNA 4th Edition has lots of recommendations for metal thicknesses, as must for appearance (oil canning) as anything - since if fully cleated, about any thickness would probably hold firm in a wind. Most are related to the flat width intended . . . They had a "Chart 12" for "Coping Design" with various metal thicknesses, for instance. Of course, I have to have my cheat-sheet to translate gage thickness to mil thickness these days . . . since I still think in gage. Lynn Javoroski FCSI CCS LEED® AP SCIP Affiliate Senior Member Username: lynn_javoroski Post Number: 2104 Registered: 07-2002 Posted on Wednesday, December 14, 2016 - 10:22 am:    Hank, how engaging (grin)