Inside a crawl space, cover exposed foundation walls with 1-1/2 inches ... "A puncture-resistant, single-layer vapor barrier is the best type," Church says. This is a Class 1 vapor barrier ...

The best crawl space dehumidifiers must meet unusually ... the crawl space first is crucial for a dehumidifier to work well. Foundation drains, vapor barriers, vent seals and waterproofing are ...