Vapor retarders limit water-vapor diffusion when they are appropriate for the assembly. They do not repair leaks, drainage problems, or existing mold. The material and placement need to suit the climate and building.
Moisture in the walls is not just a problem because of the rot, mold and mildew issues.
In cold climates, having wet insulation can actually decrease the efficiency of the insulation, making the house colder and potentially raising heating bills.
The water can also freeze and then melt rapidly, creating water stains on the walls and ceilings. Chronic moisture can also cause the wood in a structure to warp, causing structural instability.
The level of moisture in the home is crucial to achieving a healthy home environment.
The signs that conditions of excessive moisture exist may be clearly visible or they may be hidden in places such as behind walls, under furniture and carpets, and in crawlspaces or attics.
In assessing moisture problems in the home environment, it is important to know such potential hiding places and visually inspect all areas that are reasonably accessible.
Preventing and eliminating moisture control problems involves removing, diverting, blocking, or otherwise controlling the source of moisture while also providing adequate ventilation.
