DIY Crawl Space Repair: Stop Moisture and Mold Before It Starts
By Graham Mann | Published: 12/28/2025
Step-by-step DIY guide to inspect, dry, and encapsulate your crawl space — install a vapor barrier, add insulation, fix drainage, and control humidity to prevent mold.
DIY Crawl Space Repair: Stop Moisture and Mold Before It Starts Neglecting your crawl space can lead to moisture, mold, and structural damage, affecting air quality and increasing energy bills. Up to 50% of the air you breathe on your first floor comes from this space. Here's how to fix it: - Inspect for Problems: Use tools like a flashlight and hygrometer to check for high humidity (above 60%), standing water, mold, or structural damage. - Clean and Prepare: Remove debris, dry the area, and treat mold with eco-friendly solutions (avoid bleach). - Install a Vapor Barrier: Use durable plastic sheeting (10-20 mil) to block ground moisture. Seal seams with tape and fasten to walls. - Add Insulation: Use rigid foam boards or closed-cell spray foam for moisture resistance. Avoid fiberglass. - Control Humidity: Keep levels below 60% with a dehumidifier and ensure proper drainage outside (e.g., regrade soil, install a sump pump). - Seal Gaps: Close cracks around pipes, vents, and doors to pre...
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