Plumbing-Vent-Model.pdf

This is a technical specification drawing for plumbing vent stack flashing installations on built-up roofing systems. The document provides detailed construction requirements for hot and cold plumbing vent flashing assemblies, specifying materials, dimensions, and installation methods to ensure proper water-shedding and structural integrity at roof penetrations.

The specification requires soft metal flashings with minimum material standards: sheet lead at 4 pounds per square foot minimum and sheet copper at 16 ounces minimum. When copper flashing is installed over iron or steel pipes, asphalt-coated roofing felt must be applied to prevent galvanic corrosion from dissimilar metals. The flashing assembly includes a rolled soft metal flashing extending one inch down into the pipe, a steel screen, solder stainless plumbing vent stack, a flange set in specified mastic with a minimum 4-inch diameter, and a two-ply tar target adhered to the specified built-up roofing membrane over specified insulation and roof decking. For plumbing vents with diameters less than two inches, soft metal caps extending one inch into the pipe installed in specified adhesive are required. All components must comply with specified material and installation standards, with drawings provided at a not-to-scale reference for construction guidance.