Dehumidifier Installation
in Fraser Heights, BC

Fraser Heights occupies the higher ground on the northwestern edge of Surrey, overlooking the Fraser River valley and offering some of the best natural drainage in the municipality. The soils here transition from the heavy clay of lower Surrey to a siltier, better-draining mix on the upper terraces. Homes in Fraser Heights, many of which were built in the 1980s and 1990s, tend to have fewer flooding and standing-water problems than neighbours in lower-elevation areas, but they are not without crawlspace challenges.

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.