Crawlspace Encapsulation
in Port Coquitlam, BC
Port Coquitlam is a mid-sized city in the Tri-Cities area situated along the Pitt and Coquitlam rivers. Like its neighbours, it has a mix of older housing stock in the central areas built from the 1950s through the 1970s and newer development on the periphery. The proximity to both rivers means that lower-lying areas near Mary Hill and along the riverfront have seasonal water table concerns that make active sump systems important. The central residential areas around Downtown Port Coquitlam and along Shaughnessy Street are built on flatter ground where drainage relies heavily on storm infrastructure that dates from the original development of the area.
Crawlspace encapsulation is one of the most effective investments a homeowner in Surrey or the broader Lower Mainland can make. The process involves covering the crawlspace floor and walls with a continuous, heavy-duty polyethylene vapor barrier — typically 12-mil or 20-mil reinforced poly — then sealing every seam, penetration, and vent opening with industrial-grade tape and adhesive. The result is a fully conditioned environment that is physically isolated from ground moisture and the damp Pacific Northwest soil beneath your home.
The installation process begins with a thorough cleanup — removing old fiberglass batt insulation (which absorbs moisture and harbors mold), clearing any debris, and treating visible mold colonies. Technicians then install the vapor barrier across the ground, lapping it up the walls and piers, and sealing it to the stem wall with adhesive and mechanical fasteners. All vents are closed and sealed from the inside. Depending on the space, we may also install a commercial-grade dehumidifier calibrated to maintain relative humidity around 50 to 55 percent throughout the year.
Why Choose Us in Port Coquitlam?
- Experience with Port Coquitlam's specific soil and drainage conditions
- Custom-designed systems — not one-size-fits-all packages
- Fully licensed, insured, and WCB-covered technicians
- Written report with photos after every inspection
- Workmanship guarantee on all completed work
Request Service in Port Coquitlam
About Port Coquitlam — What We See Here
One pattern we see consistently in Port Coquitlam is the impact of mature tree root systems on perimeter drainage. Older residential streets are lined with large trees whose roots have found their way into original clay drain tiles installed during construction. Root intrusion blocks flow, causes tiles to offset at joints, and eventually results in backed-up drainage that directs water toward the foundation. When we assess crawlspaces in established PoCo neighbourhoods, we include a review of the condition of any visible exterior drainage and look for signs of root interference.
Port Coquitlam homeowners in the Mary Hill and Citadel areas — higher-elevation neighbourhoods with views across the valley — tend to have better natural drainage by gravity but can still face moisture issues from the clay-heavy soils retaining water at the surface and directing it toward the uphill side of foundations. We address this with improved grading and, where appropriate, exterior French drain systems along the high side of the lot.