Excess moisture, introduced by way of unsealed, vented crawl spaces, contributes to wood rot, mold growth and increased pest activity, including infestation and colonization. Moisture in crawl spaces often migrates to the upper levels of the home through a “stack effect”. The stack effect is where air travels from the sub-floor areas of your home (e.g., basement or crawlspace) then travels to the lower floors then upper floors and eventually the attic of your home.
See common symptoms of excess moisture below: