Dehumidifier Installation
in Abbotsford, BC

Abbotsford is the largest city in the Fraser Valley and the primary agricultural hub of the region. It straddles the transition between the flat Fraser River plain — the Matsqui Prairie — and the upland areas around Sumas Mountain and Vedder Mountain. This topographic divide produces very different crawlspace challenges in different parts of the city. Homes in the Clearbrook and Matsqui Prairie areas sit on some of the flattest, lowest, and most water-retentive agricultural soils in the region; the 2021 atmospheric river event that caused catastrophic flooding in the Abbotsford area demonstrated vividly how quickly these flat, low-lying areas can be overwhelmed by water.

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.