The Stack Effect
Up to 50% of the air you breathe upstairs originated in your crawl space. If it smells musty down there, you're breathing it.
Why Chattanooga Crawl Spaces Are Worst
Our high humidity plus vented crawl spaces equals constant condensation on cold surfaces. Mold loves it.
The Fix
Full encapsulation with closed cell spray foam and a heavy vapor barrier eliminates the moisture source. A dehumidifier maintains the dry environment.