Every time I tried to do the bottom of my door with some rubber products that are supposed to go into the grooves that were already there, the rubber got torn up and came out. That's when I said "to hell with it" and just installed a sweep that makes a tight seal against the threshold instead. Glad I did. There's no air coming through, except at the left and right edges where there's no seal. (Hey, a small hole lets in a lot less cold than a big hole.)

https://docs.google.com/spreadsheet/ccc?...amp;usp=sharing