How To Use Great Stuff Gaps And Cracks ((install)) Jun 2026

This foam cures by reacting with moisture in the air (and on surfaces). If you are applying it in an incredibly dry environment, a light mist of water will help it cure faster.

Unlike fiberglass insulation (the pink fluffy stuff), which merely slows down heat transfer, GREAT STUFF is an air sealant . It expands to fill the void, creating an airtight and water-resistant barrier. how to use great stuff gaps and cracks

If you have a gap deeper than 3 inches, don't try to fill it all at once. Fill the first third, mist it, wait a few minutes for it to tack up, and then apply a second layer. This foam cures by reacting with moisture in

For best results, lightly mist the foam with water after application. This introduces moisture that accelerates the curing process. It expands to fill the void, creating an

Now that you know how to use it, where should you look?

Happy Sealing