Waterproofing Pipe PenetrationsPipe penetrations are often placed by the plumbing and electrical contractors in such a manner that it is impossible to properly install the required flashings.

This detail is intended to be used where wall heights are greater than 24 inches above roof surface.

For walls 24 inches and taller, that wall cladding be considered in lieu of membrane wall flashings.

If using the option of turning the soft metal flashing down into the pipe, the possibility exists that the metal may split due to pipe expansion and contraction and/or building/roof deck settlement.

This detail is suitable for flashing round pipes used to support equipment, electrical conduit, water and gas lines, sheet metal vent flues, plumbing soil pipe vents and other similar penetration.

We'll look at seven different options that the Western States Roofing Contractors Association suggests using.

Install as local code and wind-uplift design requirements dictate.

Continuous cleats are recommended when flashing face dimension exceeds 3 inches and in areas deemed high-wind zone as categorized by local building code.

The profile of specific components, their configuration or sequencing, can vary with the roof system, climatic differences, and regional or area practices.

A look at the common components and general terms of a typical roofing system.