--- title: Rim Joist and Band Joist Insulation | House Tite, Ohio url: https://housetite.com/rim-joist-insulation/ description: Rim joists and sill plates sealed with closed cell foam, where the house meets the foundation. Central and Southeast Ohio. Call or text 740-590-5352. updated: 2026-11-06 --- *Home > Services > Rim joists: where the cold gets in* Rim joists and band joists # Rim joists: where the cold gets in The rim joist and sill plate sit right where the house meets the foundation, and a lot of cold air finds its way in there. We seal them with closed cell foam, usually along with a crawl space or basement job. Get a price Call 740-590-5352 Or text a photo to [740-590-5352](sms:+17405905352). ![Rim joists and sill plate sealed with closed cell foam where the floor framing sits on a block foundation](https://housetite.com/photos/web/rimjoist_foam_block_wall.jpg) *Rim joists and sill plate, sealed where the house sits on the block.* ## What we do Closed cell spray foam goes into each bay of the rim joist and over the sill plate. One layer insulates and fills the cracks and gaps that let air in. In a basement, it goes behind where shelving and outlets usually end up, so it is worth doing before a finish. The Department of Energy says air can leak “through multiple seams and holes where the rim joist meets the wall, the sill plate, and the subfloor”, and that “the best moisture control is achieved by filling the cavities where the floor joists meet the rim joist with spray foam insulation” [1]. ## What homeowners tell us Coreland had rooms over a crawl space running about 10 degrees cooler than the rest of the house. After the crawl space and rim joists, he says the variation dropped by 50 to 60%. > “The rooms above the crawl space were consistently 10 degrees cooler in the winter than the rest of the house. This has dropped that variation by 50-60%.” > > Coreland · crawl space and rim joists · Google review ### Get a price Call or text a photo of your attic hatch or crawl space. We come out, measure, and give you one written price for the whole job. Get a price Call 740-590-5352 ### Straight answers - [Is spray foam worth it?](https://housetite.com/insulation-questions/is-spray-foam-worth-it/) - [Crawl space vapor barrier](https://housetite.com/insulation-questions/crawl-space-vapor-barrier/) - [Cold room over the garage](https://housetite.com/insulation-questions/cold-room-over-garage/) ![Closed cell foam filling the rim joist bays between floor joists](https://housetite.com/photos/web/rimjoist_foam_joists.jpg) *Every bay filled.* ![Rim joist sealed with foam above basement closet shelves](https://housetite.com/photos/web/rimjoist_foam_closet_shelves.jpg) *Done before the shelves went back up.* ![Close view of closed cell foam over a sill plate and rim joist](https://housetite.com/photos/web/rimjoist_foam_closeup.jpg) *Over the sill plate.* ![](https://housetite.com/photos/web/video_rimjoist_homeowner.jpg) Customer video ### Rim joists and sill plates A homeowner walks through the rim joists and sill plates we sealed, and what changed in the house afterward. Watch on YouTube ![](https://housetite.com/photos/web/video_blower_door_test.jpg) Blower door test ### Measured, not guessed A blower door pulls air out of the house and measures how much leaks back in, in CFM50. Here is the test on a house we finished with closed cell spray foam. Watch on YouTube Questions about this job ### What is a rim joist? The band of framing that sits on top of the foundation wall and caps the ends of the floor joists. It is also called the band joist. The sill plate is the board under it that sits on the foundation. ### Why seal it? It is thin wood with a lot of edges and gaps, right at the outside of the house. The Department of Energy says air can leak “through multiple seams and holes where the rim joist meets the wall, the sill plate, and the subfloor”, and that “the best moisture control is achieved by filling the cavities where the floor joists meet the rim joist with spray foam insulation” [1]. ### Do you do it with spray foam? Usually closed cell spray foam, which insulates and seals the gaps in one layer. We often do it along with a crawl space or basement job. Get a price ## Tell us about the job A few details and a photo or two is all it takes. We call you back to set up a time to come out, measure, and give you one written price for the whole job. Call 740-590-5352 Text a photo 740-590-5352 Email sprayfoam@housetite.com Hours Monday to Friday, 8 to 5. Weekends by appointment. ## Sources 1. U.S. Department of Energy, Building America (PNNL and ORNL). [Energy Renovations: Insulation, A Guide for Contractors to Share with Homeowners (2012)](https://www.energy.gov/sites/prod/files/2013/11/f5/insulation_guide.pdf). --- **House Tite** · insulation contractor · Nelsonville, Ohio · call or text 740-590-5352 · sprayfoam@housetite.com · Monday to Friday, 8 AM to 5 PM Eastern. Weekends by appointment. Get a price: https://housetite.com/quote/ (or text a photo of the attic or crawl space to 740-590-5352).