moisture control in walls
It is a myth that installing vapor barriers is the most important step for controlling moisture in walls. Vapor barriers only retard moisture due to diffusion, while most moisture enters walls either through fluid capillary action or as water vapor through air leaks.
All climates require these moisture control steps:
Place a termite shield, sill gaskets, or other vapor-impermeable membrane on the top of the foundation wall. This action will prevent moisture from wicking into the framed wall from the concrete foundation wall by capillary action.
Preventing rain penetration
Causes of rain leaks through exterior walls include improper installation of the following:
Wind-driven rain can also penetrate the exterior finish. To enhance protection against rain penetration, create a drainage plane within the wall system of the home.