Plumbing stack flashing- stretched or buckled

Roofing · Roof/Wall Flashings · printed page 20 (PDF page 21)

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Stack Flashings Stretched or Buckled Systems on Roofs Stretched or Buckled Plumbing Stack Flashing

Text in the illustration

plumbing stack
stretched
roof drops down
potential water entry point
buckled
stack drops down
potential water entry points
cross section

Generated explanation

The illustration shows a plumbing stack penetrating a shingle roof, with a flashing collar and base surrounding the pipe. Two cross sections illustrate flashing deformation caused by relative movement between the roof and stack. In the upper section, the roof drops down relative to the stack, stretching the flashing and creating a potential water entry point at its roof interface. In the lower section, the stack drops down relative to the roof, buckling the flashing and creating potential water entry points around the stack.

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