Laserfiche WebLink
IRC-1838 Indian River County <br />Main Library <br />Roof Replacement 07 62 00-4 Sheet Metal Flashing and Trim <br />flashings. <br />C. Deficiencies associated with the sheet metal substrates shall be reported to Engineer <br />before beginning sheet metal work. All such deficiencies shall be corrected before <br />installing sheet metal flashings. <br />3.2 INSTALLATION <br />A. General: <br />1. All joints to be locked and sealed or soldered. <br />2. Provide for thermal movement (expansion and contraction) of all exposed sheet <br />metal. <br />3. Where dissimilar metals contact, galvanic action shall be prevented by means of <br />heavy coat of asphalt paint. <br />4. Prime all metal surfaces (top and bottom) to receive bituminous materials. Allow <br />primer to dry thoroughly before application of bituminous materials. <br />5. All metal flanges shall be installed on top of membrane and adhered as indicated <br />in detail drawings. Metal flanges connected to the roof shall be installed per <br />membrane manufacturer’s specifications and the requirements herein. <br />6. Various sheet metal sections shall be uniform with corners, joints and angles <br />mitered, sealed and secured. <br />7. Exposed edges shall be returned (hemmed); both for strength and appearance, <br />and sheet metal shall be fitted closely and neatly. <br />8. Provide cleats or stiffeners and other reinforcements to make all sections rigid and <br />substantial. <br />9. Sheet metal shall be fabricated, supported, cleated, fastened and joined to prevent <br />warping, “oil canning”, and buckling. <br />10. All sheet metal details shall provide for redundancy including but not limited to <br />sheet metal underlayment and/or sealants. This secondary protection shall be <br />installed, sealed and lapped to ensure a redundant layer of protection will shed <br />moisture infiltration in the sheet metal fails. <br />B. Sheet Metal Underlayment: <br />1. Fully adhere to substrates where indicated in Contract Drawings. <br />2. Lap adjoining sections a minimum of 3" and fully adhere. <br />3. Shall extend beyond wood blocking a minimum of 1" at roof edges and parapet <br />walls. <br />4. At roof edges and parapet walls, sheet metal underlayment shall be installed <br />concurrently with roof membrane and flashing installation. Temporary weather <br />protection utilizing other materials is not acceptable when sheet metal <br />underlayment is specified. <br />C. Fasteners: Shall be size and type required. <br />1. All fasteners to be rust resistant and compatible with materials to be joined. <br />2. All exposed fasteners shall be stainless steel screws with washers fastened <br />through 5/16” predrilled oversized holes. <br />3. All exposed fasteners into concrete or masonry shall be metal based expansion <br />anchor with stainless steel pin with washers fastened through 11/32” predrilled <br />oversized holes. <br />4. All exposed fasteners shall have factory painted heads to match the sheet metal <br />color. <br />5. Exposed horizontal surface fasteners are not acceptable. <br />D. Slip Flashing for Curbs <br />1. Fabricate slip flashing at curbs as shown in detail drawings in 10' lengths.