Crawlspace Moisture Control

Sealing a Crawlspace with VaporFree®

Moisture management and control in the crawlspace is essential for maintaining the structure. Crawlspaces fitted with traditional foundation vents are particularly vulnerable to moisture and other problems.

From a psychrometric standpoint, venting a crawlspace to remove moisture only works when the outside air is drier than the crawlspace air. “Drier” does not mean lower relative humidity, but rather a lower absolute humidity. Relative humidity is a ratio of the amount of moisture in the air relative to the amount of moisture the air can hold at a given temperature.


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