Drainage Solutions
in Ladner, BC

Ladner is the historic heart of Delta municipality, a small town centre surrounded by the flat Fraser River delta farmland that characterizes much of this part of the Lower Mainland. The residential areas of Ladner proper sit on some of the most challenging hydrology in the region — flat ground, high water tables, fine-grained delta soils with poor drainage, and proximity to the river channels and sloughs that lace through the delta. Managing crawlspace moisture in Ladner is as much about mechanical water removal as it is about vapour barriers.

Drainage problems in crawlspaces have two distinct origins: water that arrives from outside (surface runoff, failed exterior drainage, high water table) and water that condenses from the air inside the crawlspace onto cooler surfaces. The solutions for each are different, and correctly diagnosing which problem you have — or which combination — is the critical first step. Applying interior drainage solutions to an exterior water problem provides partial relief at best; addressing the exterior source is far more effective and usually less disruptive.

Interior drainage systems — perimeter drain tile installed inside the crawlspace along the base of the stem wall — are the right solution when exterior work is impractical (due to finished landscaping, hardscaping, or very tight site conditions) or when the primary issue is groundwater rising from below rather than surface water entering through the wall. Interior drain tile channels water to a sump pit where a pump removes it. This approach does not stop water from entering the foundation, but it manages it effectively once it does.