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DocuSign Envelope ID: B49FB256 -4ADF- 4759- AF63- 134AD44FC239 <br />5thWall Building Diagnostics Consultants Slate Roof Replacement <br />Orange County Skills Development Center <br />Chapel Hill, NC <br />August 2017 <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 5/8 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 />C. Verify compatibility of flashing system with other system materials. <br />D. Verify installation of all appropriate baseflashings prior to installation of sheet metal. <br />E. Verify existing field conditions. Minor dimensional detail changes may be required to fit <br />existing conditions. <br />3.02 Installation- General <br />A. Dissimilar metals shall be kept separated to prevent galvanic action. Preventive measures <br />shall include separation by suitable bituminous paint. <br />B. Where bituminous materials are to be applied to sheet metal, the flanges shall first be <br />primed with an asphaltic primer. The primer shall be interrupted where caulking is to be <br />applied. <br />C. All metal flanges shall be installed on top of membrane and set in a full bed of sealant. <br />D. Flanges of edge metal shall terminate 1/2 inch from roof -side edge of nailer. <br />17 -198 Sheet Metal Flashing and Trim <br />076200 -4 <br />