One of the best ways to save energy in your home is by caulking any cracks around windows and doors. While caulk alone can be applied to narrow cracks, gaps wider than ¼” should be filled with foam backer rod first.

These flexible foam tubes are available at building supply stores in several diameters. Simply push the rod into the gap with a putty knife or painter’s tool until it is just below the surface then caulk over it.

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