Drainage Solutions
in White Rock, BC

White Rock sits at the southwestern corner of the Lower Mainland, where the Semiahmoo Peninsula slopes down to the Strait of Georgia. The combination of proximity to saltwater, predominantly west- and south-facing exposure to Pacific weather systems, and the relatively older residential development on the hillside above the waterfront creates a distinct set of crawlspace challenges. Salt-laden air accelerates the corrosion of metal fasteners, vents, and drainage components. Soils on the steeper hillside sections drain quickly but can experience significant seasonal movement, while properties closer to sea level deal with a very shallow water table during wet periods.

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.