Rim Joist Insulation

Rim Joist Insulation Header Image

Rim Joist Insulation

Improve the Comfort and Efficiency of Your Home.

Or give us a call at 248-291-7815

Ecotelligent Homes offers basement rim joist insulation to help create a comfortable temperature throughout your home. Our rim joist insulation is paired with air sealing and additional insulation services, such as attic insulation.

Why do rim joists need to be insulated?

The basement rim joist, also known as band joist or sill plate, is an often-neglected area of the home. There are several joints that come together at the rim joist during the construction of your home, and most of the utilities like electrical and natural gas enter your home through large holes at the rim. Air sealing and insulating the basement rim joist will keep drafts out to hold heat in your home in the winter or keep your home cool in the summer.

Why is basement rim joist insulation paired with air sealing and attic insulation?

It is important to air seal and insulate the band joist and attic together to help create a comfortable temperature for every level of your home. If you insulate the rim joist in the basement, but neglect to insulate and air seal the attic, air, especially the air you pay to heat in the winter, is forced up and can escape out through the attic. Air sealing is also paired with insulating the rim joists to prevent cold floors above the basement.

What type of insulation is used for the basement rim joist?

At Ecotelligent Homes, we solely use closed cell spray foam insulation for basement rim joists. The closed cell spray foam is a thermal barrier and air barrier so it will hold in the heat in the winter and keep the drafts out. Additionally, our closed cell spray foam insulation is waterproof making it the best choice for the ground level of your home, which is susceptible to rain and exterior damage.

Fiberglass insulation should not be used when insulating rim joists. The fiberglass insulation does not stop drafts that are common at the rim joist and sill plate. The fiberglass will act like a filter and let the cold air pass through and catch some of the outside dirt and dust. If you have dirty fiberglass insulation in your Michigan basement, you have air leaks that bring in drafts and allow bugs and spiders access to your home.

Do I need to insulate my basement rim joist?

At Ecotelligent Homes, we recommend starting with an energy audit to determine if you need to insulate your basement rim joist. During the energy audit, we will identify what is causing your home to have an uneven temperatures or drafts and then suggest the proper course of action to fix the issues we find.

Contact Ecotelligent Homes at 248-291-7815 or complete our contact form above to get started with a comprehensive home energy audit.

Blog Posts

Improve Your Indoor Air Quality for A Healthy Home During COVID-19

We are spending a lot more time inside our homes to stay healthy through the COVID-19 emergency, but just how healthy is the air in your home? We have put together the following tips to help you immediately improve the indoor air quality of your home and keep your family safe. What is Indoor Air […]

Read More

Environmental Impacts of Cellulose Insulation

Homeowners are turning to green options when doing home improvements because they understand the impact their choices have on the environment. Insulation is a home improvement that plays a huge role in the environmental impact of a house, not only by increasing the energy efficiency but the materials it is made up of. Many companies […]

Read More

Basement Rim Joist Insulation for Cold Floors

It is common to experience changes in the climate of your home when the seasons change. As the cold air and snow arrive in Michigan, you may notice certain areas of your home being much warmer or colder than other areas. Varying room temperatures causing you to wear an extra layer or use a blanket […]

Read More

Case Studies

Al W.

Overview Al W. is concerned about saving the Earth. While he updated the mechanical system in his home, he knew more could be done to make his home energy efficient. Problem Ecotelligent started by conducting an energy audit. During the audit, we found that the attic insulation was below ENERGY STAR levels and had multiple […]

Read More

The Miller Family

Overview The Miller family was experiencing drastically different temperatures throughout their 1900’s farm house home causing them to be uncomfortable and concerned with their carbon footprint. Problem The Ecotelligent Homes team started with an energy audit. During the audit, we found a lack of proper insulation in the attic, basement and walls. They also determined […]

Read More

Historic Home Wyandotte

Overview Homeowners of a historic home in Wyandotte were suffering from a cold 2nd floor in the winter and a hot 2nd floor in the summer. Problem The homeowners knew they needed insulation but weren’t sure how to insulate the attic because of the furnace and duct work on the attic floor. Approach Ecotelligent Homes […]

Read More


Ecotelligent Homes is a home performance contractor, which means we are a one-stop-shop and we manage the project from start to finish. We follow a three-step process when assessing and improving the comfort and energy efficiency of your home.

We can identify the source of your comfort and efficiency issues and present you with a solution to resolve the problem at its root.

Our licensed and insured team will install your improvements to industry-leading standards.

Our quality assurance check confirms the quality of our work and its impact on your home’s energy efficiency, comfort and health.