Insulating the floor over a crawl space requires taking into consideration moisture control (both over the ground and as to the insulation) and whether you have a vented or unvented crawl space. (Unvented crawl spaces may require insulation of the perimeter instead.)
Moisture control requirements will depend on your property and climate and should be evaluated by a contractor. Floor insulation also requires air sealing of the floor before installing insulation. (Energy Savers)
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- Under-floor insulation must be installed with R-value ≥ 19 to full joist depth.
- Insulation must be installed per Title 24 Quality Insulation Installation standards.