Crawl Space Insulation

Crawl space insulation involves adding protective material beneath your home to regulate temperature, reduce energy costs, and prevent moisture problems. Whether you're dealing with cold floors, high utility bills, or humidity concerns, proper insulation makes a noticeable difference in comfort and efficiency. From material selection to vapor barriers, there's a lot to consider. Angi helps you find the right pro and guides you through every step of the process.

Related to Crawl Space Insulation Service

Crawl Space Insulation Service Articles and Advice
Deane Biermeier  •  Mar 19, 2026
8 Tips on How to Insulate a Crawl Space
Insulating a crawl space is an essential step toward reducing mold, offensive smells, and moisture damage potential. Learn helpful tips here.
Find Insulation Contractors near you
Share your project details and we’ll match you with up to 3 available pros near you.
Common Crawl Space Insulation Service Questions

Yes, crawl space insulation is worth it if installed correctly. Installing insulation in your crawl space will improve the air quality, help stabilize your home's temperature, lower your energy bills, and prevent pests from entering your home. Though you’ll pay more to install insulation initially, the savings you get from installing insulation can help offset those initial costs over time.

The lifespan of crawl space insulation depends on how well you maintain your insulation and the type of insulation. Fiberglass will need replacing every 15 to 20 years on average if you don't have a vapor barrier in place. If you do have vapor barriers in place, then your insulation could last much longer. Spray foam insulation can last anywhere from 80 to 100 years. 

Three signs that you need crawl space insulation are drafts, high energy bills, and mold. Drafts can start in crawl spaces and cause hot or cold air to spread to the rest of your home through holes in the floors and walls. And even if your entire home is well-insulated, you can still feel an unchecked draft from your crawl space and in your utility bill. Uninsulated crawl spaces can let in air and moisture, and because they’re built directly on the ground and difficult to dry out, they are hotspots for mold and mildew.

Several types of insulation are effective for crawl spaces, with spray foam and rigid foam boards being two of the best options. Closed-cell spray foam insulation is a strong choice because it effectively repels moisture, resists biological growth, seals the air, and provides excellent thermal protection, especially in hard-to-reach areas. Rigid foam insulation boards are another excellent material as they insulate well, resist water damage, and will not settle over time like fiberglass or cellulose.