Why insulate your Basement Band Joist?

The band joist area in your home is located along the perimeter of the house where the floor joists for the 1st floor sit on top of the foundation walls. It is often easiest to find this detail in your unfinished basement, but you may be able to find accessible band joist space behind dropped ceilings as well.This area is typically one of the major air leakage spots on the lower portion of the house because of numerous framing connections and electrical and mechanical penetrations. It is also often the first foot or so of the house which is above ground, so it is the area which tends to allow the most air leaks at the foundation. These air leaks can cause colder basements, cold floors on the 1st floor and frozen pipes in the winter time. 

Evidence that your Band Joist Needs an Upgrade
  • Dirty fiberglass near the outer perimeter of your unfinished basement areas
  • Colder 1st floor areas throughout your home in the winter
  • Drafts on the 1st floor and basement that don’t seem to have an obvious location.
  • Frozen basement water pipes in the winter
  • Condensation forming on your basement ductwork in summertime
Our Solution

Typically, the band joist area is insulated with fiberglass insulation that is ineffective at keeping the cold out because it does not stop air movement.  It is often most cost effective to replace the fiberglass insulation with spray foam insulation to improve the comfort of the house while reducing the amount of time the furnace/ air conditioner runs.  This is recommended for all areas where the band joist is accessible without the removal of drywall.

The Atlas Home Energy Experience

By choosing Atlas Home Energy for your home upgrades, we promise to:

  1. Smooth Process – Atlas staff will manage and perform every step of your home upgrade from the initial evaluation, to the completion of the variety of upgrade projects, to the follow up testing, to the filing for financial incentives. We will take care of the logistics and the details, so that you don’t have to. While there are a lot of steps along the upgrade process and many different construction experts and trades we have designed our processes to make the upgrade experience seamless and efficient.
  2. Measurable Results – We perform follow up testing for all of the services that we provide, so that we give you quantifiable results to show you where your home was before your upgrade and how much it has improved.
  3. Industry Leading Warranty – We use materials and equipment that are of the highest quality because we want our upgrades to last for as long as you live in your home. If you suspect that a product we installed stopped performing as promised, we will send an expert out to evaluate and fix the issue at no charge to you anytime within your warranty period.  

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