Ever wonder why your floors feel cold no matter how much you heat the house? The rim joist โ that band of framing sitting right on top of your foundation wall โ is almost certainly the culprit. It's one of the most overlooked air-leakage points in any home, and most Northeast Arkansas houses built before 2010 have zero insulation there.
Here's the problem in real numbers. A typical Jonesboro ranch home has roughly 150โ200 linear feet of rim joist, translating to about 100โ150 square feet of exposed wood and fiberglass-stuffed gaps. Uninsulated, that zone can account for 15โ20% of total envelope heat loss โ especially brutal during those January cold snaps when temps drop into the teens.
The fix contractors love is two-component closed-cell spray foam applied at 2 inches thick. That hits R-13, seals air infiltration in one step, and meets IRC R402.2.1 requirements for crawl and basement assemblies in Climate Zone 3 (that's us). Cost runs $1.75โ$2.50 per board foot installed, and a typical rim joist job is done in a single morning.
Some builders substitute cut-and-cobble rigid foam with canned foam around the edges. It works, but field-applied closed-cell is faster, monolithic, and won't shift over time. For a 120 SF rim joist, you're looking at roughly $350โ$500 total โ and homeowners routinely report the cold-floor complaint disappearing by the next heating season.
Fall is the perfect window to get this done before December propane bills arrive. We're scheduling rim joist jobs now throughout Jonesboro, Trumann, and the surrounding area.
Reply here or DM us for a free estimate โ takes about 15 minutes on-site to scope it out.