Curb-for-Air-Handling-Unit.pdf

This is a technical drawing specification document for a built-up roofing curb assembly designed to accommodate an air-handling unit installation on a roof structure. The document provides detailed construction specifications for the curb's components, including an 18-gauge minimum steel frame, wood curb construction, and fastening requirements at 8-inch on-center spacing with counterflashing secured at 8-inch minimum intervals. The drawing outlines a two-ply stripping system with gravel surfacing and specifies the integration of base flashing, insulation layers, and cant membrane installation. An alternate frame location is indicated for heavy-unit applications, with the roof deck to be fitted with gasketed fasteners (minimum two per side) to ensure structural integrity and weather resistance.

The specifications detail material requirements including adhered base flashing, specified sealant tape application, and membrane sheet configuration, though specific pricing, quantities, delivery timelines, and contract award dates are not addressed in this drawing document. No information regarding set-asides, incumbent contractors, funding sources, or renewal options is present in this technical specification file.