Crawlspace Encapsulation
in Walnut Grove, BC

Walnut Grove is one of the Township of Langley's largest and most established residential communities, developed primarily in the late 1980s and 1990s. The neighbourhood sits on the flat benchland between the Fort Langley bluffs and the Nicomekl River, with clay-loam soils that drain slowly. The housing here is predominantly single-family, with crawlspace foundations that are now 25 to 40 years old — old enough that original vapour control and insulation have degraded significantly in many cases.

Crawlspace encapsulation is one of the most effective investments a homeowner in Surrey or the broader Lower Mainland can make. The process involves covering the crawlspace floor and walls with a continuous, heavy-duty polyethylene vapor barrier — typically 12-mil or 20-mil reinforced poly — then sealing every seam, penetration, and vent opening with industrial-grade tape and adhesive. The result is a fully conditioned environment that is physically isolated from ground moisture and the damp Pacific Northwest soil beneath your home.

The installation process begins with a thorough cleanup — removing old fiberglass batt insulation (which absorbs moisture and harbors mold), clearing any debris, and treating visible mold colonies. Technicians then install the vapor barrier across the ground, lapping it up the walls and piers, and sealing it to the stem wall with adhesive and mechanical fasteners. All vents are closed and sealed from the inside. Depending on the space, we may also install a commercial-grade dehumidifier calibrated to maintain relative humidity around 50 to 55 percent throughout the year.