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How to Caulk Wide Cracks


While caulk alone can be applied to narrow cracks, gaps wider than 1/4” should be filled with foam backer rod first. Watch this video to find out how. ...More



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How to Caulk Wide Cracks

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Using foam backer rod to fill a wide crack before caulking.

Using foam backer rod to fill a wide crack before caulking.

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 1/4” 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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  1. Paul Artman Says:
    September 23rd, 2015 at 1:07 pm

    Thank you for information (video) concerning backer rod and how to use. This was very helpful in a job of using mortar mix.

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