Preventing Moisture Issues in Crawlspaces: A Homeowner’s Guide

crawlspace image with moisture issues - pre-removal

Moisture issues in crawlspaces are not only unpleasant but can also lead to significant damage to your home’s structure and indoor air quality. From mold growth to wood rot, moisture-related problems can wreak havoc if left untreated. Fortunately, there are steps homeowners can take to prevent moisture issues in crawlspaces and protect their homes.

First and foremost, completely encapsulated crawlspaces are now recommended over open crawlspaces. If you still have an open/vented crawlspace, get a free crawlspace assessment today!

For years, standard building practice was to insulate underneath the floor over a ventilated, unconditioned crawlspace
[like in the image above]. A better approach is to build a well-sealed, unventilated crawlspace (i.e., build the crawlspace like a basement) by sealing and insulating the foundation walls rather than the subfloor. (excerpt from Energystar.gov)

Having a proper vapor barrier on the crawlspace floor of at least 6 mils thick ensures you have the performance of a class II vapor retarder to prevent ground moisture from seeping into the space.  Using a quality closed-cell spray foam on the perimeter ensures the temperatures stay closer to the ambient temperatures of your home to keep your ductwork and waterlines inside the thermal boundary.

Schedule your free crawlspace assessment with Superior Insealators today!


Another essential measure for preventing moisture issues is to address any sources of water intrusion around your home’s foundation. Inspect your gutters, downspouts, and landscaping to ensure proper drainage away from the foundation. Repair any leaks or cracks in the foundation walls or plumbing fixtures promptly to prevent water from entering the crawlspace.

When it comes to insulation, choosing the right material is crucial for preventing moisture buildup in crawlspaces. Closed-Cell Spray Foam insulation, with its ability to seal out air and moisture, is an excellent choice for crawlspace insulation. Unlike traditional insulation materials that can trap moisture and promote mold growth, closed-cell spray foam forms a seamless barrier that keeps moisture out and maintains a dry, healthy crawlspace environment.

Preventing moisture issues in crawlspaces requires a combination of moisture control measures and high-quality insulation. By taking proactive steps to keep water out of your crawlspace and investing in quality insulation like Superior Insealators Closed-Cell Spray Foam, you can protect your home from moisture-related damage and enjoy a healthier living environment for years to come

Schedule your free crawlspace assessment with Superior Insealators today!

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