In many buildings, air leakage is the single greatest source of heat loss through the building envelope. Air-leakage areas can be difficult to find, but they’re usually inexpensive to fix. This lesson illustrates common air-leak locations found in residential buildings. A variety of common building characteristics create air leaks. If you can recognize these building characteristics, then finding the air leaks is simple. You’ll learn the following.

  • Where to look for major leakage areas.
  • How to correctly seal various types of air leaks.
  • Techniques to measure the post-improvement effectiveness of air-sealing work.