Wind-driven air leaks through exterior walls
Why it happens here
The bench sits above the valley and takes wind that lower neighborhoods never feel. That wind pushes cold air through every gap in the wall assembly, from outlet boxes to rim joists. Standard fiberglass batts do not stop air movement.
Our approach
We seal every penetration with spray foam or caulk before adding insulation. On the windward side, we spec higher R-values and use mineral wool or foam board. A blower door test before and after shows the actual reduction in air leakage.