Travis Brungardt walks through a crawl space encapsulation job where tight access ruled out his usual layered approach of rigid foam board, batt insulation, and sealed vapor barrier. With barely enough room to move, he opts for closed cell spray foam instead, applied straight over the crushed stone and up the foundation wall into the rim joist. He explains how this method delivers a continuous air seal, blocking moisture and radon while adding thermal insulation, all in a single application rather than multiple separate steps. Travis notes the importance of installer diligence in cramped conditions, since gaps in coverage undermine the seal, and reflects on when spray foam makes sense despite the trade-offs some builders weigh around off-gassing and installation consistency.

Check out more of Travis' videos on The Build Show and follow him on Instagram at the links below.
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