Crawl space moisture is one of the most common hidden problems in Lower Mainland homes, especially older ones in Langley, Surrey and Abbotsford. Wet soil, open vents and missing or torn plastic let damp air build up under the house, leading to mould, rot, pests and cold floors. A sealed crawl space vapour barrier is the first fix, followed by proper wall insulation. Our winter guide explains what to look for and how to fix it. Read our Lower Mainland crawl space vapour barrier guide.