Crawl Space Thermal and Moisture Control. Info-512: Crawlspace Insulation. Crawlspaces should be designed and constructed as mini-basements.
Crawlspaces should not be vented to the exterior (see FAQ on Crawlspace Venting). They should have their floors uninsulated, the ground vapor sealed, their walls insulated and air sealed, and their air conditioned with indoor air. Traditional vented crawlspaces are often damp, mouldy and inhabited with pests.
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