Crawlspace Insulation
in Clearbrook, BC

Clearbrook is one of the older residential communities in Abbotsford, developed as a distinct Mennonite farming settlement before being absorbed into the modern city. The residential areas of Clearbrook have housing stock from the 1950s through the 1970s on relatively flat terrain with heavy clay soils — conditions very similar to the older Fraser Valley communities we serve throughout the Lower Mainland. Crawlspace moisture and mold issues are common in this housing stock, which was built to the standards of its era.

The majority of homes in Surrey and the surrounding communities built before 2000 have fiberglass batt insulation installed between the floor joists in the crawlspace. When this insulation was new and dry, it provided reasonable thermal resistance. The problem is that fiberglass batts installed in a vented crawlspace environment in a high-rainfall climate like ours rarely stay dry. They absorb ambient moisture, sag out of their cavities, and gradually collapse onto the ground. Wet fiberglass insulation has essentially zero R-value, adds weight that can pull down on vapor barriers or staples, and provides a hospitable nesting environment for rodents.

For crawlspaces that are not being fully encapsulated, we install new unfaced fiberglass batts or mineral wool between the joists, but only after addressing the moisture conditions that destroyed the previous insulation. Installing fresh batts into a still-damp crawlspace environment means you'll be back in the same situation within a few years. Proper sequencing matters: drainage, vapor barrier, then insulation.