Crawl Space & Raised Floor Insulation in McKinney, TX

Crawl Space & Raised Floor Insulation is for houses built on pier-and-beam rather than a slab, along with additions and porches enclosed over a crawl space. If your floors feel cold in January, the room over the crawl space smells musty, or old batts are hanging down under the house, this is the work that fixes it.

Why clay soil matters here

McKinney and the land around it sit on the Texas blackland prairie, where the soil is dark alkaline clay that swells when it gets wet and shrinks when it dries. The McKinney climate table shows May as the wettest month, averaging 5.68 inches of rain. Clay that holds water after spring storms keeps the ground under a raised house damp, and damp air under the floor wrecks fiberglass batts. That is why we check drainage, gutters and moisture before insulating anything.

The two approaches

The first is to insulate the floor itself: closed-cell foam sprayed on the underside of the subfloor and between the joists. It seals the gaps around pipes and wiring, will not sag, and does not soak up water. The second is to treat the crawl space as part of the house: a heavy vapor barrier on the ground, sealed vents, and insulation on the perimeter walls. The first is simpler and works for most vented crawl spaces. The second takes more work and makes sense when moisture is persistent. We quote whichever fits, and both when both are reasonable.

Plumbing and access

Pipes under a raised floor are the ones that freeze first in a hard cold snap; McKinney's record low is -7F. Foam on the subfloor helps, but pipes left in an open, vented crawl space may still need their own insulation. We note that on the quote and keep access to plumbing and any ductwork under the house.