What Is The Best Way To Deal With Crawl Space Air? Step 1: Take Away The Trim And Ground Covering Concrete is a porous substance and requires air circulation. As temperatures in the basement fluctuate, it creates the perfect setting for moisture to build up between the underpad and http://cleverdeck72849.theobloggers.com/2028600/a-spotlight-on-speedy-systems-for-sub-floor-ventilation-fan