Cambridge, MD Crawlspace with open vents

When the vents in your crawlspace are "closed" they are still  open. The fact is, open vents are a bad idea in the first place. All they do is let damp, wet air into the crawlspace and that leads to rot and mold. DryZone blocks and seals vents with a thick foam board (the same insulation we use to make the floors warmer).  Sealing the crawlspace will lead to better air quality throughout the house and will cut down on the moisture and damp conditions that breed mold and invite critters and insects.