Select and Unroll Backer Rod

to just fall right through or it's just going to be like endless filling it with caulking. So, I'm going to use backer rod. If you've never seen this, this is backer rod. You're going to stuff this down there. It's going to give some backing for the caulking to actually sit on so you don't just have this endless space. There's different size backer rods. Right here I've got a pretty big backer rod cuz the gap right here is about an inch right there, an inch to an inch and a quarter, then it goes almost