Encapsulation and Sealing
Foundation Vent Sealing
Foundation vents were meant to dry crawl spaces, but in humid weather they often bring in more moisture than they remove. When a crawl space is being sealed, we close the vents with insulated covers or foam board, then seal the edges.
- Best forVented crawl spaces being sealed
- Typical rhythmOften a few hours
- TeamInstallers who fit vent covers and foam
- Pairs well withEncapsulation and wall insulation
What you get
What foundation vent sealing includes
- 1Insulated coversVents are closed with rigid panels or purpose-made covers.
- 2Sealed edgesCaulk or foam closes gaps around each opening.
- 3Looks tidy outsideCovers are chosen to blend with the foundation.
- 4Part of a systemVent sealing works with the liner and humidity control.
How it goes
From the first call to a dry, finished space
- 1Count the ventsWe find every vent and opening.
- 2Fit the coversPanels are cut and secured from inside.
- 3Seal the edgesGaps are caulked or foamed.
- 4Check airflowWe confirm that no outside air is flowing in.
Good fit when
Is foundation vent sealing right for you?
- Your crawl space is damp in summer
- You are encapsulating or conditioning the space
- Vents are broken, missing or covered with debris
- Cold air blows in during winter
Questions
About foundation vent sealing
Won't a sealed crawl space trap moisture?
Not if the soil is covered and humidity is controlled. Sealing keeps outdoor humidity out, and a dehumidifier or conditioning handles what remains.
Do I need to open vents in any season?
In a properly sealed system, no. We explain how the space is kept dry without relying on vents.
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 
Vented-to-Closed Crawl Space ConversionTurn a damp, vented crawl space into a closed, conditioned one.See the service 
Crawl Space Wall InsulationRigid foam on the foundation walls for a warmer, tighter space.See the service Where we work
Find foundation vent sealing near you
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Thinking about foundation vent sealing?
Call or text, or send the form. Tell us what you have noticed and we will tell you how we would handle it.