Ever wonder why your floors feel cold even after you've insulated the attic? The rim joist might be the culprit โ and most homeowners in Jonesboro and Trumann have never heard of it.
The rim joist is the band of framing that sits on top of your foundation wall, right where the floor system begins. In Climate Zone 3 (Northeast Arkansas), the IRC energy code (R402.1.2) calls for R-13 minimum in rim joists for existing homes โ but we routinely find them completely bare on houses built before 2010.
Closed-cell spray foam is the gold-standard fix here. A 2-inch lift delivers about R-13, seals out air infiltration, and acts as a vapor retarder all in one shot. Material runs roughly $1.50โ$2.25 per board foot installed, and a typical 1,500 SF footprint house has maybe 150โ180 linear feet of rim joist โ so the whole job often lands between $400 and $900. That's one of the best dollar-per-dollar insulation upgrades you can make.
Beyond the code checkbox, the comfort difference is real. Rim joists are notorious cold-air entry points from October through February when temps in Craighead County routinely dip into the 20s. Sealing them also cuts down on moisture intrusion and keeps pests from finding a cozy gap to squeeze through.
If your heating bill spiked last November and your floors still feel drafty, schedule a quick rim-joist inspection before we hit the real cold. It's a fast job โ most are done in a single morning โ and the payback usually shows up on your first winter utility bill.
Reply here or DM us for a free estimate. We serve Jonesboro, Trumann, Paragould, and the surrounding Northeast Arkansas area.