Ever wonder why your floors feel cold in January even after you've added attic insulation? The culprit is often your rim joist โ the band of framing that sits right on top of your foundation wall. Most homes in Jonesboro and Trumann have zero insulation there, and that gap is hemorrhaging conditioned air every single day.
A rim joist insulation job uses closed-cell spray foam applied at 2 inches thick, hitting R-13 in a spot that previously had R-0. Closed cell is the right call here because it air-seals and insulates in one pass and it's vapor-resistant โ critical when you're spraying right next to a concrete foundation that pulls moisture year-round.
What does it cost? Expect $1.50โ$2.50 per board foot installed, depending on access and linear footage. A typical 1,500 SF ranch-style home in Northeast Arkansas runs roughly 150โ180 linear feet of rim joist, so most jobs land between $600โ$1,100 โ often completed in half a day. That's a fast payback when your October gas bill is already climbing.
IRC R402.1.2 requires rim joists in new construction to meet the same thermal envelope requirements as the rest of the wall assembly (R-13 minimum in Climate Zone 3). If your home was built before 2012, there's a good chance it was never brought to that standard.
September is honestly the best window to get this done. Temps are dropping at night, foam cures fast in moderate weather, and you'll feel the difference before the first real cold snap hits in November. Don't leave that band of framing bare another winter.
Reply to this post or DM us for a free rim joist estimate โ we serve Jonesboro, Trumann, Paragould, and surrounding Northeast Arkansas communities.