Knee walls are common in most homes, yet you may not know what they are. A knee wall is a short wall that is approximately two to three feet high. Knee walls are often found in attics, but are not necessarily in all attics. They are used to block in the unusable space where the rafters meet the top plates/attic floor. This creates more usable attic space.

Go into the attic or simply imagine yourself in the attic. If your attic is unfinished, it has a triangular shape. At the bottom points of the triangles, the rafters meet the top plates of the exterior walls. This is where a knee wall is installed.

The space behind the knee wall is often not insulated or air sealed, and the wall itself does not provide enough thermal barrier to protect the temperature of the attic interior.

Insulating knee walls can help protect the temperature of your attic and the interior temperature of your home.

Benefits of Knee Wall Insulation

Fully insulating your attic is one of the best ways to improve your home’s energy efficiency and cut down on energy bills. More than 70% of energy lost in your home is due to upward airflow, so ensuring your attic is fully insulated and air sealed will help prevent climate controlled air from escaping. That means your home will stay warmer in the winter and cooler in the summer without overworking your heating and air conditioning systems.

Insulating knee walls is a piece of the insulation process that can be overlooked and lead to unnecessary heat loss. Our experienced insulation professionals at DeVere Insulation Home Performance will identify whether you have a knee wall and ensure it is thoroughly insulated to keep your home protected from the elements.

Types of Attic Insulation

Whether you’re building a new home with a knee wall or working to upgrade the energy efficiency of an existing home, DeVere Insulation Home Performance in Baltimore can help you determine which type of insulation is best for your attic. We commonly install blown-in fiberglass insulation or spray foam insulation to reach difficult spaces like the area behind knee walls. Air sealing also goes a long way toward cutting down on heat loss and improving your home’s energy efficiency. After inspecting your attic and knee wall, we’ll walk you through the available options and help you determine which type of insulation is right for your home.

Knee wall insulation.
Knee wall insulation.

Baltimore’s Premier Insulation Contractors

Hiring an experienced home insulation contractor is vital to ensuring your insulation is installed properly and provides your home with the protection it needs. Poorly installed insulation won’t work to its fullest capacity and could mean you’re missing out on energy savings. A professional attic insulation company like DeVere Insulation Home Performance will also help you save money on rebates while making the process as smooth and efficient as possible.

If you’re interested in insulating the knee walls in your attic contact us today for a free estimate!


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