Problem: Water Penetration Through The Brick Veneer.
The trapping of water which passes through the veneer into the wall assembly can result in corrosion of ties and shelf-angle connectors or, if driven through the exterior sheathing, can result in deterioration of wall framing and damage to interior finishes as previously discussed in "Generic Problems".
Cause: Improper flashing and counter-flashing installation.
Solutions:
- Minimize reliance on caulk. Provide flashing and counter-flashing at all intersections between roofs and walls. This will accommodate all differential movement between the two surfaces and prevent the entry of water as shown in Figure 45.
![Flashing Over Intersecting Roof](images9/flashing%20over%20intersecting%20roof.gif)
Figure 45 - Flashing Over Intersecting Roof.
- Install stepped flashings along the slope of the roof with a bend extending up the wall. Prove a head lap of 3 inches (75 mm) along the slope of the roof. Install counter-flashing to extend 6 inches (150 mm) up the brick veneer. The flashing should be embedded a minimum at 1 inch (25 mm) into the mortar joint and lapped over the base flashing by at least 4 inches (100 mm). Make certain that the base flashing and counter-flashing are the same metal to avoid deterioration caused by electrolysis.