Crawl Space Encapsulation

An unencapsulated crawl space acts as a humidity pump for the entire house above it. Moisture evaporating from bare soil passes through the crawl space and into the living area through the floor system, raising indoor humidity, promoting mold growth on joists and subfloor sheathing, and creating conditions that accelerate wood rot and pest infestation. In Oxnard, where marine air already brings elevated ambient humidity, an open dirt crawl space compounds moisture problems year-round.

Our encapsulation process begins with a thorough inspection and cleanup of the crawl space—removing debris, old deteriorated vapor barriers, and any standing water. We then install a 20-mil reinforced polyethylene liner across the entire floor and up the foundation walls, sealed at all seams and termination points with specialty tape and mechanical fasteners. Vents are closed and sealed to prevent humid outdoor air from entering, and the crawl space is effectively conditioned as part of the building's thermal envelope. Where additional moisture control is needed, a crawl space dehumidifier sized to the square footage is installed and plumbed to drain automatically.

Encapsulating your crawl space delivers benefits beyond moisture control: floors above feel warmer in winter, HVAC efficiency improves because ducts running through the crawl space lose less energy to the unconditioned environment, and the crawl space becomes a clean, accessible utility area rather than a damp, uninviting void. Oxnard Foundation Repair backs every encapsulation installation with a multi-year warranty on materials and workmanship.