Crawl Space Air Sealing and Conditioning
Air leaks at the rim joist, around pipes and through the floor connect the crawl space to the house and the outdoors. We seal them with foam and sealant, then condition the space with a dehumidifier or a small amount of conditioned air, so the space and the home above stay comfortable.
- SealsRim joist, penetrations, floor gaps
- MethodsFoam, sealant, mesh
- ConditionsDehumidifier or supply air
- ResultSteadier humidity and temperature
What is included
- 1Fewer draftsCold air stops sneaking up through gaps.
- 2Steadier humidityThe space is controlled on purpose.
- 3Comfort upstairsFloors feel warmer and drier.
- 4Lower energy wasteLess leakage to chase.
From the first call to a dry crawl space
Our partner experts repair and protect crawl spaces in cities across the country. Find yours below and ask for a free estimate.
- 1FindWe find leaks with a smoke pencil and eyes.
- 2SealFoam, sealant and mesh close the gaps.
- 3ConditionDrying or air supply is set up.
- 4VerifyWe re-check readings.
Is this the right service for you?
- A home with cold or drafty floors
- A crawl space that stays damp after sealing
- Owners who want steady humidity
- A house with leaks at the rim joist
Common questions
Do I still need a dehumidifier?
Often yes. Even a sealed space gains moisture from the soil and the air, and drying holds it steady.
Is conditioned air safe?
Properly designed supply air is a common method. We explain how we set it up.
Will this lower my energy bill?
It can help by cutting air leakage. We do not promise a figure.
Services that pair with this one
Crawl Space EncapsulationSeal the floor, walls and vents so ground moisture and outside air stay out of the space under your home.See the service 
Crawl Space Dehumidifier InstallationA dehumidifier made for crawl spaces, sized to the space and set to drain on its own.See the service 
Energy Efficiency UpgradesCrawl space fixes that cut drafts, steady your floors and reduce wasted energy.See the service Find your city
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Find out what is under your house.
Call or text, or send the form for your free estimate. Tell us what you notice, from smells and cold floors to water and sagging.