Dehumidifier Installation
in Vancouver, BC

Vancouver's crawlspace work is dominated by the city's older residential housing stock — particularly in East Vancouver, Hastings-Sunrise, Grandview-Woodland, and Renfrew-Collingwood, where pre-war and early post-war homes on full perimeter foundations (many of them with crawlspaces rather than full basements) are common. These homes were built in an era when crawlspace ventilation was the design standard, and many have had little or no maintenance to the subfloor environment in the decades since. When we inspect crawlspaces in homes of this vintage, we routinely encounter original wood framing with significant moisture damage, corroded metal connectors, and mold colonies that have been growing unchecked for years.

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.