Pitch-Pocket-with-Grout.pdf

This is a technical drawing specification document for built-up roofing construction detailing a hot/cold pitch pocket assembly with grout. The drawing, designated as DWG No. 33 and dated 2023, provides construction specifications for a roof penetration detail at a scale of NTS (Not to Scale). The specification details the installation of a metal pitch pocket with a minimum 4-inch height that accommodates roof penetrations, requiring a wood nailer secured to the roof deck with appropriate fasteners installed in two staggered rows spaced 24 inches on center. The assembly includes specified insulation, built-up roofing (BUR) membrane with gravel surfacing, and a metal flange set in specified asphalt cement and mechanically fastened at 3-inch intervals in a staggered pattern.

The detail specifies that the metal flange be primed before stripping and that a two-ply top-off application be applied using Tremco sealant. The interior of the pitch pocket and pipe base shall be primed to prevent grout leakage into the building structure. The pocket is to be filled to 1 inch from the top with non-shrink grout and topped with a metal hood, with a membrane installed under the primed metal flange. The specification requires detailed attention to material sequencing and fastening patterns to ensure watertight installation and structural integrity of the roof penetration.