Crawl Space Insulation

What is insulation?

In an encapsulated crawl space, insulation moves from where it used to be (fiberglass batts between floor joists) to where it should be (closed-cell foam board on the foundation walls). The change reflects modern building science: in a conditioned crawl space, the building envelope is the foundation wall, not the underside of the floor.

Why you need it

• Permanent thermal barrier that doesn't sag, soak, or harbor pests like fiberglass does
• Reduces seasonal temperature swings in the crawl space
• Improves HVAC efficiency by keeping the crawl space conditioned
• Required by Tennessee energy code for many new constructions and substantial renovations

Our process

1. Old fiberglass removal. Pull out all existing fiberglass batts (almost always wet, moldy, or sagging in older Tennessee homes).
2. Wall prep. Confirm the vapor barrier is sealed against the foundation wall. Mark stud or anchor locations.
3. Foam board cut and fit. Cut 2-inch closed-cell rigid foam panels to fit wall dimensions. Mechanically fasten or adhere.
4. Seam and edge sealing. Seal all joints between panels and at the top sill plate with foam sealant.
5. Inspection. Verify continuous coverage with no thermal bridges.

Cost range

$1,500 – $4,500

Standalone insulation cost. Usually bundled into a full encapsulation.

Where we serve

Available statewide. Fastest response in our primary Tennessee metros: