Dehumidifier Installation
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.

Humidity management is the operational heart of any crawlspace encapsulation system. Sealing the crawlspace envelope stops the major sources of moisture entry, but the residual humidity in the sealed space — from the soil itself, from diffusion through concrete stem walls, and from any minor air leakage — needs somewhere to go. In most Lower Mainland crawlspaces, a properly sized commercial dehumidifier running continuously is the right answer. The target is to maintain relative humidity at or below 50 to 55 percent year-round, which is the threshold at which mold growth and wood-boring insect activity become effectively impossible.

Proper sizing is critical. An undersized dehumidifier will run continuously without reaching the setpoint humidity level, eventually burning out its compressor. An oversized unit is not a problem in terms of dehumidification, but it costs more upfront and uses more energy than necessary. We calculate required capacity based on crawlspace square footage, current moisture load (as measured during inspection), the vapor barrier coverage and sealing quality, and the seasonal humidity patterns typical for the specific location.