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5thWall Building Diagnostics Consultants Government Services Annex <br /> District Attorney Office <br /> Roof Replacement <br /> November 2009 <br /> M . Brass Wire Mesh : Shall be 1 /4 inch by 1 /4 inch mesh, formed of No . 18 gauge brass wire . <br /> N. Flashing Cement : Shall be asphalt based , non- asbestos fiber flashing cement conforming to <br /> the requirements of ASTM D4586 , Type II . <br /> 2 . 03 Fabrication <br /> A . In addition to complying with all pertinent codes and regulations , comply with all <br /> pertinent recommendations as noted in the " Architectural Sheet Metal Manual " , 6th <br /> edition, 2003 , as published by the Sheet Metal and Air Conditioning Contractors National <br /> Association , Inc . ( SMACNA ) . <br /> Be Fabricate and install sheet metal sections in 10 - foot lengths except where shorter lengths <br /> are required by construction . <br /> Co Flanges of metal flashing to be incorporated into the roof system shall be a minimum of <br /> four inches in width . Provide pre - drilled holes at three inches o . c . staggered for insertion <br /> of nails . Holes shall be located one inch from the leading edge of the flange ; second row <br /> to be one inch from the first . <br /> D . Form sections square , true, and accurate to size , free from distortion, sharp edges , and <br /> other defects detrimental to appearance or performance . Shop fabricate sheet metal <br /> sections to the maximum extent possible . <br /> E . Junctures , intersections , corners and unions of sheet metal shall be fabricated from one <br /> piece with minimum 18 - inch legs ; legs shall not be longer than 24 inches . Seam corners <br /> for rigidity, seal with sealant . <br /> F . Fabricate vertical faces with bottom edge formed outward 1 /4 inch and hemmed to form <br /> drip . <br /> G . At all locations where new sheet metal sections abut walls , copings , or terminate , the <br /> sheet metal flashings shall terminate with end sections of one -piece construction to <br /> provide watertight seams . Seams shall be sealed ; seams of copper or stainless steel shall <br /> be soldered . <br /> H . Sheet metal flashings shall be fabricated and installed to allow for expansion and <br /> contraction of the component materials without buckling, hole elongation , fastener <br /> failure , or excess stress loading situations developing at any time during the temperature <br /> cycle . Clips shall be designed and installed to resist rotation and to avoid shear stress <br /> when roofing materials expand and contract . Flashing shall not be installed across <br /> expansion joints . <br /> PART 3 EXECUTION <br /> 3 . 01 Inspection <br /> A . Inspect nailer areas to verify that they are clean, smooth, and free of depressions , waves , <br /> or projections and solidly supported over joints . <br /> B . Verify that roof openings , pipes , sleeves or vents through roof are solidly set . <br /> Co Verify compatibility of flashing system with other system materials . <br /> 09 -26 Sheet Metal Flashing and Trim <br /> 076200 -4 <br />