Plumbing-Vent-Model.pdf

This is a technical drawing specification document for plumbing vent flashing details related to a Middle School Roof Replacement project in Michigan. The drawing (DWG No. 08) provides construction specifications for soft metal flashings used in roofing applications, specifically detailing the installation requirements for plumbing vent stacks and their integration with built-up roofing (BUR) membranes. The specifications outline requirements for sheet lead (minimum 4 lb per square foot) and sheet copper (minimum 16 oz) flashings, with provisions for asphalt-coated roofing felt when copper flashing is installed over iron or steel pipes to prevent galvanic corrosion. The drawing indicates that plumbing vents with diameters less than 2 inches shall utilize soft metal caps, with a minimum 1-inch penetration into the pipe and a minimum 4-inch flanged base for attachment to the roofing membrane using specified mastic adhesive.

The technical specifications require installation over two target plies of the specified BUR membrane with insulation and roof deck as specified in project documents. All soft metal components must be sealed with specified mastic, and stainless steel screening is shown as optional. The drawing is presented at a not-to-scale (NTS) format and includes detailed cross-sectional views showing the relationship between the plumbing vent stack, flashing materials, roofing layers, and structural components. This specification document serves as a reference standard for contractors bidding on or executing the roof replacement work to ensure proper weatherproofing and durability of penetrations through the new roofing system.