How to Insulate a Window With Foam Insulation

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Flexible spray foam insulation is a good way to seal gaps between windows and framing. The foam expands to fill these gaps, preventing air leaks, but remains flexible, so it doesn't crack or cause the windows to bow with changes in weather or settling of the house. Spray foam insulation comes in a can and is easy for the do-it-yourselfer to apply. It's an inexpensive way to seal air leaks and can be used in both new construction and existing homes.

Things You'll Need

  • Pry bar
  • Wood block
  • Razor knife
  • Hammer
  • Finishing nails
  • Remove the facing of the frame around the window to expose the gap between the window and the framing lumber. Use a pry bar and a block of wood to protect the wall around the window frame. Be careful not to break the window facing.

  • Fit the flexible tubing onto the can of spray foam. Insert the end of the tube into the crack between the window and the framing lumber and depress the trigger on the can. Start at the top and move slowly down the window. Fill the crack halfway; the foam will expand to fill the rest.

  • Allow the foam to dry. Trim any excess that extends out of the gap past the edge of the window with the razor knife (utility knife).

  • Replace the window facing, using a hammer and finishing nails.

Tips & Warnings

  • Wear rubber gloves, old clothes and safety glasses when working with spray foam insulation.
  • Be sure to use the flexible spray foam insulation specially formulated for use with windows and doors and not the rigid spray foam insulation made for other purposes.

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