FOUNDATIONS

The foundation is a moisture barrier and can be a source of problems in the crawl space. Foundation vents allow air to circulate through the basement, so these openings should be sealed with weather-stripping or rubber gaskets. Make sure your foundation vents are located at least four feet above grade and sloped toward the outside of your home (away from any walls).

Wood framing expands and contracts with changing temperatures and seasons, creating cracks that allow moisture to enter the crawl space. The cracks can also cause air leaks through the wall voids, which may be as small as 1/8″ wide or larger.