Should You Spray Foam Your Rim Joists?

Should You Spray Foam Your Rim Joists? blog header image
January 18, 2023

Many Wisconsin homeowners understand the value of insulating your attic, or your home’s exterior walls. Insulation protects your home from outside temperatures, keeping you warmer in the winter and cooler in the summer. Insulating and air sealing your home not only makes your home more comfortable, but it lowers energy bills and prevents unwanted outdoor air pollutants from entering your home as well.

One of the most important but least discussed areas of your home to insulate are the rim joists in your basement. Today, we’re going to explain how insulating your rim joists can make such a difference in your home’s comfort and energy use and why spray foam insulation is the right insulation material for the job.

What Are Your Rim Joists and Why Do They Need to Be Insulated?

Rim joists are part of your home’s floor framing. They’re connected to your home’s foundation and run perpendicular to the floor joists. Rim joists and end joists form the sections of your floor frame that are exposed to the outdoors.

Because they run along the edge of your home, on top of your foundation, your rim joists and end joists are the most likely areas in your basement where heat and air will enter and exit. Insulating and air sealing rim joists and end joists offers a layer of protection to keep outdoor temperatures and air out of your home.

The Benefits of Spray Foam Insulation for Basement Rim Joists

Wisconsin basements can be damp and sources of indoor moisture, which can damage and weaken the performance of many insulation materials. But closed cell spray foam insulation has a few benefits that other insulation types like fiberglass and cellulose lack:

  • Spray foam insulation acts as both insulation and an air sealant

  • Spray foam insulation acts as a water and vapor barrier

These unique qualities make spray foam a long-lasting and effective choice for insulating the rim joists in your basement.

Schedule a Home Performance Audit Today to Get Started

Wisconsin Home Improvement is an insulation contractor near you serving the greater Milwaukee area with superior spray insulation services. Starting with our home performance audit (sometimes known as an energy audit), we can determine the state of your home’s existing insulation (or lack thereof) and check for air leaks to help us recommend the home improvement services that will make an actual difference!

Make your home more comfortable and energy efficient. Call 262.345.9922 or contact us today to learn more about insulating your rim joists with spray foam insulation.

Insulate your home’s rim joists with high-quality spray foam.

Talk to the leading insulation company near you!


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