Through-wall flashing is commonly fabricated by deforming the metal in such a way as to provide bond strength in mortar joints. The ends of the flashing must be dammed to prevent water that has been caught from draining back into the wall. Use of pea gravel is recommended behind brick veneer. The flashing must typically rise at least 8' from the low point at the exterior face of the building to the high point inside the wall. Through-wall flashing is used at all points where moisture may enter the wall, and in selected places particularly susceptible to water damage.
This flashing method is considered the most satisfactory method of preventing leaks except in areas exposed to earthquakes. Description: Through-wall flashing is used to divert moisture, which has entered the wall, to the outside, before it can cause damage.
