November 2, 2004


Conditioned crawlspaces perform better than vented crawlspaces in terms of safety, health, comfort, durability and energy consumption. Conditioned crawlspaces also do not cost more to construct than vented crawlspaces. Despite that, there is not a significant trend towards the construction of conditioned crawlspaces. The model codes do not allow the construction of “unvented” crawlspaces – except in very limited circumstances, but they do allow the construction of “conditioned” crawlspaces. The distinction is important and necessary. Four conditioned crawlspaces were constructed and monitored over a 12-month period. The data is presented and used to support the current code requirements for the construction of conditioned crawlspaces.