When Spray Foam Isn't Enough - Crawl Space Encapsulation in Lillian

Spray foam does a lot of things well. But controlling ground moisture in a crawl space isn't one of them. This home in Lillian came to us with humidity so bad that condensation was actively dripping from the spray foam overhead - and that moisture was sitting right under the floors. Left alone, that's the kind of situation that leads to rot, mold, and structural damage.

Here's the thing a lot of homeowners don't realize - spray foam insulation on the subfloor above does nothing to stop moisture vapor from rising up through the ground. It's two different problems. The spray foam handles thermal performance. The encapsulation system handles ground moisture. You need both working together, or you're only solving half the equation.

We came in and installed a full crawl space encapsulation with a heavy-duty vapor barrier running wall to wall and up the foundation walls. The liner is mechanically fastened to the walls and sealed at the seams - no gaps for moisture to sneak through. That alone makes a massive difference. But given the humidity levels this space had, we knew a vapor barrier by itself wouldn't be enough.

That's where the AprilAire dehumidifier comes in. It's a commercial-grade unit purpose-built for crawl spaces, and the display was already reading a dropping humidity level right after install. It runs automatically, pulls moisture from the air, and drains continuously so the homeowner never has to think about it. It's the kind of set-it-and-forget-it solution that actually protects the structure long-term.

The floors above this crawl space are safe now. The wood framing isn't sitting in a wet environment anymore. This is what crawl space work is really about - not aesthetics, not a quick fix, but protecting the bones of the house from the ground up.