Base-Sheet-Fastener-7-Inch.pdf

This is a technical drawing specification document for roof base sheet fastener placement on a built-up roofing system constructed over lightweight concrete decking. The document provides detailed installation requirements for securing Tremco-specified base sheets to roof decking using approved fasteners and plates. The fastener spacing requirements specify 7-inch on-center spacing along sidelaps and within two equally staggered rows positioned 12 inches from each edge along the longitudinal center of the sheet. Perimeter edge fastening must be increased by 70 percent and corner fastening by 160 percent in accordance with FM Global Loss Prevention Data Sheets 1-28 and 1-29. The specification establishes a minimum fastener spacing of 4 inches on center and requires fastener density determination on a unit area basis, with provisions for adding additional rows and increasing fasteners per row as needed to meet performance requirements.

The document does not contain information regarding pricing, contract terms, award dates, response deadlines, set-asides, or funding sources. This specification serves as a technical control document for construction quality assurance and installation standardization rather than as a procurement or bidding document.