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Insulating Your Rim Joist

If your home has a basement, it has a rim joist. This is the place where the basement ceiling framing and home siding intersect above the foundation wall. You might be wondering, “Should I insulate my rim joist?”

The short answer to this question is “Yes!” After all, without proper insulation, the rim joist is a major source of heat loss in your home. Here are the reasons why insulating this area is worthwhile along with the various options available to you.

Benefits of Rim Joist Insulation

If you’re planning to add insulation around your home, make sure the rim joist is among the locations you address. There are several benefits of boosting home insulation levels (including the rim joist). It helps:

  • Lower energy bills: One of the most important features of an energy-efficient home is proper insulation. By keeping conditioned air inside where you want it, you end up maintaining a comfortable home more easily and at a lower expense.
  • Reduce greenhouse gas emissions: Any time you cut back on energy consumption, you certainly save money, but you’re also doing your part for the environment. If a lower carbon footprint is your goal, increasing rim joist insulation is a step in the right direction.
  • Improve comfort: If you have ever sat next to a drafty window, you appreciate how uncomfortable outdoor air infiltration can be. A well-insulated rim joist helps keep the basement at a comfortable, steady temperature on par with the rest of the house.

Rim Joist Insulation Options

Two materials often used for insulating rim joists include:

  • Spray foam: Professionals agree that this is one of the best rim joist insulation option. It both seals nail holes and insulates the area effectively. Spray foam requires an experienced installer, but the end results are worth the effort.
  • Foam board: Two-inch, foil-faced foam board insulation is another option, though it’s more time-consuming to install. Once the board is cut to size and fit in place, spray foam seals gaps around the edges.

Chicago Area Insulation Installers

As a Chicagoland company, ThermaSeal/Lakeside Insulation is the right company to insulate your rim joist. We have been installing residential and business insulation across the Chicago area since 2001. For your initial consultation and estimate, contact us online or call 800-836-2535.

Products We Install
Fiberglass Insulation

Fiberglass insulation is often the most economical of insulation choices to buy and easiest to install.


Help prevent mold and excessive moisture infiltration in homes you build with our waterproofing services.

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