What are the most common places where air may be leaking out of or in to my home?

You may already know the obvious places where air leakage occurs in your home, such as an under-the-door draft, but if you take a little time you may discover a lot of smaller leaks that really add up to a big hit to your wallet.

On the outside of your house, inspect all areas where two different building materials meet, including:

  • All exterior corners
  • Outdoor water faucets
  • Where siding and chimneys meet
  • Areas where the foundation and the bottom of exterior brick or siding meet.

Inside your home, inspect around the following areas for any cracks and gaps that could cause air leaks:

  • Electrical outlets
  • Switch plates
  • Door and window frames
  • Electrical and gas service entrances
  • Baseboards
  • Weather stripping around doors
  • Fireplace dampers
  • Attic hatches
  • Wall- or window-mounted air conditioners.
  • Cable TV and phone lines
  • Where dryer vents pass through walls
  • Vents and fans

Also look for gaps around pipes and wires that enter your home, as well as foundation seals, and mail slots. Make sure exterior storm doors and primary doors seal tightly. Inspect windows and doors for air leaks. See if you can rattle them, since movement means possible air leaks.  If you can see daylight around a door or window frame, then the door or window leaks. Shut a door or window on a dollar bill. If you can pull the dollar bill out without it dragging, you're losing energy. You can usually seal these leaks by caulking or weather stripping them. Check any storm windows to see if they fit and are not broken. Inspect any existing caulking and weather stripping to make sure it is applied properly and in good condition -- leaving no gaps or cracks. 

Check your state and local codes before starting any project. Follow all safety precautions. Every effort has been made to ensure the accuracy and safety of this information. Neither Westlake nor any contributor can be held responsible for damages or injuries resulting from the use of the information in this document.

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