Through Wall Flashing

Interior finish damage, mold development and wall staining are some of the indicators of a water penetration problem that can be addressed with through-wall flashing, although these are commonly misdiagnosed as roof or window leaks. Therefore it is important to choose an experienced waterproofing contractor like Dry Building Solutions that can accurately diagnose the source of the leak.


Through-wall flashing is commonly made from copper or other noncorrosive metal, and is used at all points where water may enter the wall or in areas that are particularly susceptible to water damage. It extends from the sheathing, across the airspace, and all the way to the exterior of the brickwork.

See diagram below.

Diagram courtesy of the

Copper Development Association.