Box Sills / Rim Joist
Improve Home Efficiency Upgrade Your Box Sills / Rim Joist
Stop Up to 25% of Heat Loss
Basement Box Sill / Rim Joist Insulation
The box sill (or rim joist) area—located between the top of the foundation and the subfloor above—is one of the most common sources of air leakage in older or poorly insulated homes. In fact, up to 25% of a home’s heat loss can occur through this area alone.
The most effective way to seal and insulate it is with closed-cell spray foam, which provides both thermal insulation and an air/moisture barrier. Properly insulating this space can significantly improve your home’s energy efficiency and year-round comfort.
Box Sills in the basement
Box sills are one of the thinnest points in a home’s exterior. Our spray foam solutions are designed to insulate the box sills in your basement to reduce air filtration both in and out of your home.
By creating an airtight seal, spray foam will seal all of the nooks and crannies in your box sills, which increases your energy efficiency, reduces your monthly energy bills, and enhances comfort in your basement living space.
A Lifetime Warranty For Our Insulation Services
We’re proud to stand by our work and provide a lifetime transferable warranty.
Sealing and Insulating Rim Joists
Rim joists, located along the perimeter of your home where the floor framing meets the foundation wall, are a common source of air infiltration—especially due to the stack effect. This makes them a critical area to properly air seal and insulate.
At Healthy Homes Insulation, we use closed-cell spray foam to effectively seal and insulate rim joists. This helps reduce heat loss in the winter and minimizes heat gain in the summer, keeping your home more comfortable year-round.
In addition to energy savings and improved comfort, sealing this area also acts as a barrier against unwanted pests and rodents entering through gaps or cracks.
Safe & Cost Effective
We use a product with minimal off-gassing, so you’ll be back in your home within 2-3 hours after applying.
Not only is spray foam a cost-effective insulation solution, but it also saves you money on your monthly energy bill – indefinitely. We also back every project with a transferable lifetime warranty!
