Base-Sheet-Fastener-7-Inch.pdf

This is a technical drawing specification document detailing fastener placement requirements for a built-up roofing base sheet installation on lightweight concrete decking. The drawing, designated DWG No. 15, specifies the use of approved fasteners with spacing requirements of 7 inches on center along sidelaps and in two equally staggered rows down the longitudinal center of the sheet, positioned 12 inches from each edge. The specification includes provisions for increased fastening density at perimeter edges (70% increase) and corners (160% increase) in accordance with FM Global Loss Prevention Data Sheets 1-28 and 1-29. The fastener spacing shall not be closer than 4 inches on center, with additional rows and increased fasteners per row to be added as necessary based on unit area calculations. The base sheet is specified as Tremco brand material to be attached to the roof decking with specified Tremco fasteners and plates, with a separator layer and lightweight concrete substrate identified in the drawing.

No pricing information, contract terms, response deadlines, award dates, or procurement-related details are contained in this technical specification document. The drawing is presented at not-to-scale (NTS) and represents the 2023 version created in AutoCAD, focusing exclusively on the mechanical installation requirements for the roofing base sheet system rather than commercial or contractual terms.