What Is Crawl Space Insulation?
In a sealed crawl space, insulation moves from the subfloor (the traditional location in a vented system) to the interior foundation walls. This brings the crawl space into the conditioned building envelope, protects HVAC ducts and water pipes from temperature extremes, and reduces heat transfer between the ground and the living space above. APS installs rigid foam board and spray foam insulation on crawl space walls as part of encapsulation projects or as standalone insulation upgrades in existing sealed spaces. The correct R-value depends on crawl space height, wall composition, and climate zone, APS specifies the right product for each project. Insulating crawl space walls as part of encapsulation is significantly more effective for Alabama's climate than traditional subfloor batt insulation, which traps moisture, sags over time, and provides no moisture control benefit.
How APS Approaches Crawl Space Insulation
- 1
Free On-Site Assessment
A trained APS technician visits your property, documents the problem, and identifies the root cause before recommending any repair.
- 2
Written Estimate
You receive a clear scope of work and cost with no obligation. We explain the method chosen and why, in plain language.
- 3
Repair and Transferable Warranty
Our trained crews complete the repair using professional equipment. All APS repairs carry a warranty that transfers to future owners.
What Does Crawl Space Insulation Cost?
$1,500 to $4,500 depending on crawl space perimeter and insulation type
Frequently Asked Questions
Should I insulate the floor or the walls in a sealed crawl space?
Walls. In a sealed crawl space, insulating the foundation walls brings the space into the conditioned envelope. Subfloor insulation is appropriate for vented crawl spaces but provides no moisture control benefit and tends to sag and deteriorate in Alabama's humidity.