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The most common locations for basement air leaks include:

  • Along the top of basement walls where the cement or block foundation comes into contact with the wood frame
  • Holes for wiring and plumbing going into external walls
  • Any holes or gaps where the electrical, gas or oil fill pipes go through the wall
  • Furnace flues
  • Leaky ducting or poorly fitted hot-air registers
  • Around window and door framing
  • Cracks in the foundation wall and slab
  • Floor drains

For more information, visit ENERGY STAR®.

Did you see a building science or energy efficiency term you did not understand? Check out our glossary.