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My concrete garage floor has a control joint (relief cut) down the center of it and where my garage door closes on top of it (perpendicular to the cut) there is a substantial air gap. It's big enough to see daylight through with the door closed. Any recommendations on how to seal that gap up?

I've done some searching but could never find exactly what I was looking for. I've got a townhouse that was built in 2006 so everything is modern construction. The walls of my garage are insulated so I'm planning to insulate my ceiling and garage door to keep it a little warmer during the...