Encapsulation and Sealing
Crawl Space Wall Insulation
In a sealed crawl space, the walls are insulated instead of the floor. We attach rigid foam board to the foundation walls, seal the joints and finish with the vapor barrier, which keeps the space warmer and drier and helps floors above feel more comfortable.
- Best forSealed or conditioned crawl spaces
- Typical rhythmOften one to two days
- TeamInstallers who cut and seal foam board
- Pairs well withEncapsulation and rim joist foam
What you get
What crawl space wall insulation includes
- 1Rigid foam boardSmooth panels resist moisture and keep their shape.
- 2Sealed jointsSeams are taped or foamed to stop air movement.
- 3Warmer floorsA tempered space reduces cold surfaces above.
- 4Neat finishPanels are cut cleanly around pipes, vents and ducts.
How it goes
From the first call to a dry, finished space
- 1Prep the wallsWe clean and repair the foundation walls.
- 2Cut and fit the panelsFoam board is measured and attached.
- 3Seal the jointsSeams and edges are sealed for an air-tight layer.
- 4Finish with the linerThe vapor barrier is joined to the wall insulation.
Good fit when
Is crawl space wall insulation right for you?
- You are sealing the crawl space
- Floors above feel cold
- Existing floor insulation is falling or wet
- You want to bring the space inside the thermal envelope
Questions
About crawl space wall insulation
Why insulate the walls and not the floor?
When the crawl space is sealed and tempered, the walls become the boundary. That keeps pipes and ducts in a milder space and avoids wet insulation under the floor.
Is foam board safe against moisture?
Rigid foam does not absorb water like fiberglass does, which is why it works well on crawl space walls.
Related services
Often paired with this
Crawl Space EncapsulationA sealed, dry, clean crawl space that stops damp air before it reaches your floor.See the service 
Rim Joist Spray Foam InsulationSpray foam on the rim joist, one of the leakiest spots in the whole house.See the service 
Vented-to-Closed Crawl Space ConversionTurn a damp, vented crawl space into a closed, conditioned one.See the service Where we work
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