Those cold floors above your basement or crawl space aren't just uncomfortable — they're costing you money every month. The rim joist is that critical junction where your foundation meets your floor framing, and it's one of the biggest energy leaks in Arkansas homes.
Rim joists typically run around the entire perimeter of your basement or crawl space. Without proper insulation, you're looking at massive air leakage and thermal bridging. We're talking about losing 15-25% of your heating and cooling energy through this one area alone.
For Northeast Arkansas homes, closed-cell spray foam is your best bet for rim joists. You need R-15 minimum per Arkansas energy code (IRC R402.2.12), but we recommend R-20 to R-25 for real comfort. Closed-cell foam provides both insulation and air sealing in one application — no gaps, no settling, no rodent highways.
Batt insulation stuffed between rim joists is basically useless here. It doesn't air seal, leaves gaps around utilities, and creates moisture problems. Spray foam costs about $1.50-$2.25 per board foot, but the energy savings pay for themselves in 3-4 years.
A typical Jonesboro ranch home needs about 200-300 board feet of rim joist foam, running $400-$650 total. Compare that to losing $200+ per year on your energy bills with no insulation.
Reply or DM us for a free rim joist inspection and quote. We'll show you exactly where your energy dollars are escaping.