Dehumidifier Installation
in Fort Langley, BC

Fort Langley is a designated heritage community on the south bank of the Fraser River, known for the Hudson's Bay Company fort and the historic village that grew up around it. The residential streets near the historic core contain some of the oldest surviving homes in the Fraser Valley, with some properties dating back to the late 19th century. These homes are of significant heritage value, and any crawlspace work in this community must be approached with an understanding of the historic building methods and materials involved.

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.