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NC State Extension

Air Sealing – Defined

The process of sealing the leaky nooks and crannies in a structure often with caulk, spray foam or weather stripping. Many of the biggest leaks in homes are in attics and crawlspaces. Sealing these areas is a very cost-effective way to increase energy efficiency. Practical info: this is often the most cost effective way to increase a home’s energy efficiency and improve how well insulation works.

Air infiltration can account for 30 percent or more of a home’s heating and cooling costs and contribute to problems with moisture, noise, dust, and the entry of pollutants, insects, and rodents. Reducing infiltration can significantly cut annual heating and cooling costs, improve building durability, and create a healthier indoor environment. The size of heating and cooling equipment can also be decreased, which saves additional dollars.


  • Air Sealing Products
  • A more advanced (and thorough) resource by U.S. Dept. of Energy – Retrofit Techniques & Technologies: Air Sealing, A Guide for Contractors to Share with Homeowners
  • Air Sealing Measures


Page Last Updated: 5 years ago
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