Insulating Attic Knee Walls

Attic knee walls—those short vertical walls that support the roof rafters—are often overlooked during insulation projects. Yet, they play a major role in maintaining consistent indoor temperatures. URL :foamexpertgroup.com

Why Knee Wall Insulation Matters

Without proper insulation, attic knee walls can become a major source of heat loss in winter and heat gain in summer. This happens because the small triangular spaces behind them are often left uninsulated or poorly sealed. As a result, warm air escapes through gaps, making your HVAC system work harder.

To fix this, install rigid foam board or spray foam on the attic side of the knee wall. Ensure air barriers are sealed with caulk or foam to prevent leaks. Adding batt insulation between the wall studs can further enhance energy efficiency. According to Wikipedia, effective insulation reduces heat transfer, keeping interior spaces more comfortable.

Also, don’t forget to insulate the attic floor behind the knee wall and cover any exposed areas with an air barrier. Properly insulating attic knee walls not only lowers energy bills but also improves overall comfort by minimizing temperature swings between rooms.

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