Roofing Detail: Pipe Penetration with Field-Wrap Flashing
The profile of specific components, their configuration or sequencing, can vary with the roof system, climatic differences, and regional or area practices. Dimensions as shown are recommended minimums and are intended to be approximate to allow for reasonable tolerances due to field conditions.
The horizontal flashing flanges are recommended to be a minimium of 3 inches wide, with a 6-inch wide flange being the preferred dimension.
For sunny, hot, and/or high altitude projects located in winter-time heating climates, WSRCA suggests that thermoplastic single-ply roof membranes and flashing ply(s) be white, or another light color, to provide a reflective surface minimizing heat gain and thermal aging.
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. Check local building codes.
Certain components as depicted in these details may not be provided by the roofing contractor.