The leaky band around the top of your foundation, sealed and insulated so drafts and cold floors stop at the edge.
The rim joist, or band joist, is the board that runs around the top of the foundation and sits below the exterior wall. It has many seams, it touches masonry and it is often completely uninsulated, so it leaks air and heat all around the house.
We seal the rim joist with closed-cell spray foam, or we cut foam board to fit each bay and seal the edges with foam, so air cannot slip through. It is a quick project with a visible effect on drafts, cold floors and the humid air that enters in summer.
The rim joist has dozens of gaps where framing meets the foundation and the sill. Together they can leak as much air as an open window.
Closed-cell spray foam seals and insulates in one step. The cut-and-cobble method uses foam board sealed at the edges, which is a good option when spray foam is not practical.
Batts in the rim joist let air through and can hold moisture against wood. A foam seal does the job without these problems.
We leave an inspection gap or follow your pest provider guidance where needed, so insulation does not hide a problem.
Drag the handle to compare.
BeforeAfterCloses every joint and seam.
Choice by access and budget.
Cold air kept outside.
Foam does not absorb water.
Inspection gaps kept as needed.
Most homes in one day.
Every topic has its own page with what to expect and how we approach it.
Project situationCrawl Space HomesIn our humid climate, the crawl space shapes the comfort of your floors and the air in your…Learn more 
Project situationHot and Cold RoomsOne room is always too warm and another is always too cold. Here is why it happens and…Learn more 
Material guideSpray FoamOpen-cell and closed-cell foam insulate and seal in one step. Here is how to choose and what to…Learn more Enter the area and the thickness to see board feet of foam and the approximate R-value for open-cell and closed-cell.
You tell us what is going on, which rooms bother you and what you hope to change, and we set a time that fits your day.
We walk the attic, walls, crawl space and equipment, measure depths and use thermal imaging when it helps.
We protect the house, seal air leaks, place baffles and fix small problems so the insulation can do its job.
Loose-fill, batts, foam or board goes in to the planned depth, with clean edges and clear markers.
We measure the result, take photos and test air leakage when the scope includes it.
We walk the finished work with you, answer questions and leave the site clean.
Yes. It is a fast, high-impact upgrade, especially when floors feel cold or the basement is drafty.
Spray foam seals more fully. Foam board is a good alternative where spray foam is not suitable.
Foam does not absorb water, but we check for leaks or termites first.
Most homes take half a day to a day.
Yes. The method is the same, adapted to the available access.
Basement Wall InsulationInsulation that handles moisture and cold concrete, turning an unfinished basement into usable, comfortable space.Explore 
Crawl Space EncapsulationA sealed, dry, conditioned crawl space with a heavy vapor barrier, so humidity, mold and cold floors stop…Explore 
Whole-Home Air SealingEvery major leak in your home found and closed, from attic and basement to the small gaps around…Explore 
Floor and Subfloor InsulationInsulation under cold floors, over crawl spaces, garages and cantilevers, so the floors above feel warm underfoot.Explore Tell us about the project and we will call you back to talk it through.
Or call (615) 357-7797 to talk now.
