Your rim joists are probably the biggest energy leak you've never heard of. These wooden box beams where your floor meets the foundation wall create a thermal bridge that can waste 15-25% of your heating and cooling dollars.
In Northeast Arkansas, rim joists are especially problematic during our humid summers and occasional cold snaps. Without proper insulation, you're essentially heating and cooling the outdoors through these gaps.
Here's what works: Closed-cell spray foam at 2-3 inches gives you R-13 to R-20 and creates an air seal. Cost runs $3-5 per square foot installed. For a typical 1,200 SF home, expect to spend $800-1,200 but save 20-30% on energy bills year-round.
The old method of stuffing fiberglass batts into rim joists doesn't work. Batts don't air-seal, and moisture from our humid climate can cause mold and rot. Rigid foam boards work better but require careful caulking at every seam.
Best time to tackle this? Right now before summer heat really kicks in around Jonesboro. Most rim joist jobs take 4-6 hours, and you'll feel the difference immediately in comfort and lower bills.
Reply or DM us for a free rim joist inspection and estimate.