Crawl Space Insulation & Encapsulation
Most cold floors, musty smells, and stubborn humidity in Four Corners homes trace back to one place: an unconditioned crawl space. We close it up — closed-cell foam on the walls and rim joists, sealed vapor barrier on the ground — and bring the space inside the house.
What a Sealed Crawl Space Fixes
Warm floors
5–10°F warmer floor surfaces above a sealed, conditioned crawl.
Lower humidity
Stop the evaporation engine under the house — drier basement and main floor.
Less mold & rot
Dry framing means longer-lasting subfloor, joists, and ducts.
Cleaner indoor air
Up to half the air you breathe upstairs came through the crawl space. Seal it up.
Our Crawl Space Approach
- 1
Inspect & test
Moisture readings, mold or wood-rot survey, radon check where appropriate, and a check of drainage and grading outside.
- 2
Remediate first
Pull failed batts, clean what needs cleaning, fix obvious bulk-water problems before we ever spray foam.
- 3
Seal the envelope
Closed-cell foam at the rim joists and walls; a heavy sealed vapor barrier on the floor that runs up the walls and gets terminated cleanly.
- 4
Condition & verify
Add a small supply or dedicated dehumidifier where needed, then re-check humidity and seal continuity before we call it done.
Crawl Space FAQs
Why insulate the crawl space walls instead of the floor above?
Modern building science says: bring the crawl space inside the conditioned envelope. Insulating the walls and rim joists with closed-cell foam — and capping the dirt floor with a sealed vapor barrier — keeps the space dry, the floor above warm, and the ducts and pipes down there working with you instead of against you. Floor-joist insulation alone leaves a cold, humid, mold-prone space below.
Do I need full encapsulation, or just insulation?
It depends on what we find. A dry, well-drained crawl space might only need closed-cell foam on the rim joists, walls, and a heavy vapor barrier on the ground. If we see moisture, radon, mold, or animal entry, we step up to full encapsulation — sealed seams, sumps where needed, and (often) a dehumidifier on a smart controller. We'll walk you through what your space actually needs.
Will this make my floors warmer?
Yes. Cold floors in the kitchen and bath above a vented crawl space are almost always a crawl-space problem, not a floor problem. Sealing and insulating the perimeter typically raises floor surface temperatures 5–10°F in the rooms above.
What about radon and moisture?
Encapsulation reduces both. A continuous, sealed vapor barrier blocks soil-gas radon entry through the floor and tested seams, and locks down the evaporation that drives humidity into the rest of the house. Where readings or risk warrant it, we add active radon mitigation tied into the same membrane system.
Do crawl space jobs qualify for rebates?
Often, yes. LPEA and the Colorado HEAR program cover insulation and air sealing components of crawl space work, and the federal 25C tax credit may apply. We document the air-sealing and insulation portions specifically so they're easy to claim.
Dry Crawl Space. Warm Floors.
Free inspection. We'll tell you exactly what the space needs — no upselling, no scare tactics. Just a clear plan with rebates factored in.