EERE Consumer's Guide: Caulking

December 12th, 2017

Caulking Caulk forms a flexible seal for cracks, gaps, or joints less than 1-quarter-inch wide. You can use a caulking compound to seal air leaks in a variety of places throughout your home, including around windows and door frames. In addition to sealing air leaks, caulking can also prevent water damage inside and outside of the home when applied around faucets, ceiling fixtures, water pipes, drains, bathtubs and other plumbing fixtures. Before caulking any air leaks in an existing home, you need to do the following, if you haven't already: Detect air leaks, assess your ventilation needs for indoor air quality.