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January 29th, 2013 at 1:42 pm

Flashings – The Basics

Roof Flashings – 101

Roof flashings are the system components that weatherproof or seal the membrane at the roof edge or anywhere the membrane is penetrated.

Basically, they seal the roof at the edges and at penetrations.

Types of Roof Flashings


Parapet Walls




Ridges and Valleys


Vent Stacks

Roof drains

Expansion joints

TPO and PVC flashings should never be mixed together, because they will not weld together. This is a common installation mistake, which should never be made.


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