DuPont Great Stuff Gaps & Cracks Insulating Foam Sealant 12 Oz., Cream

Everyone knows what Great Stuff is. When you need it, there's really no alternative. It is expanding urethane foam that will fill cracks and gaps. I had a crack in my garage floor that mice were using to get inside. Great Stuff filled it. No more mice. It's also good for sealing around new door and window installations. Remember: a little goes a long way. Also remember: it's sticky and hard to remove so plan your application. Put newspaper down. Wear gloves. You'll find all kinds of places to use it. Nothing else will do.