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Every home has air leaks, but the cumulative total leakage can vary widely based on whether air sealing efforts have been made. To measure the amount of leakage in a home a tool called a blower door is used.

Air leakage in a house can cause uncomfortable drafts, but beyond that, energy researchers have discovered that sealing air leaks in a home is one of the simplest and least expensive ways to save energy.

Minimizing air movement in and out of a house is key to building an energy-efficient home. Controlling air leakage is also critical to moisture control.

Here are some general techniques for air sealing that are used in house construction.