What R-value do I need under a raised floor?

R-19 is the level most commonly specified for raised wood floors over crawl spaces in California.

Should I insulate the floor or encapsulate the crawl space?

Floor insulation suits dry, vented crawl spaces. If you have persistent moisture, odors or mold, encapsulation with a dehumidifier is usually the better long-term fix.

Crawl Space Insulation

Warmer floors and a drier home start underneath. Shop R-19 fiberglass batts for raised floors over crawl spaces, the standard for older homes across Los Angeles, Pasadena and the Valley, or have our licensed crew insulate your crawl space for you.

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Two Ways to Insulate a Crawl Space

Vented crawl space: insulate the floor

Install R-19 batts between the floor joists with the kraft facing up, held by wire supports, and cover the ground with a vapor barrier.

Sealed crawl space: encapsulate

Close the vents, line the floor and walls with a heavy liner and control humidity with a crawl space dehumidifier. It's the better fix for persistent moisture or mold. See crawl space encapsulation.

Before You Insulate

Fix plumbing leaks and drainage problems.
Clean up rodent contamination and old, fallen insulation.
Check for mold on joists and subfloor.

Our crews handle the whole process: cleaning, insulation and encapsulation. See our crawl space encapsulation cost guide.

Crawl Space Insulation FAQ

What R-value do I need under a raised floor?: R-19 is the level most commonly specified for raised wood floors over crawl spaces in California.
Should I insulate the floor or encapsulate the crawl space?: Floor insulation suits dry, vented crawl spaces. If you have persistent moisture, odors or mold, encapsulation with a dehumidifier is usually the better long-term fix.