I just installed a new garage door seal, but I've noticed gaps at both corners. My previous seal got squished flat to fill the gaps, but this new one has a center core for added rigidity. I've considered using threshold seals but am worried they might trap water and debris, especially in winter when snow from my car can create quite a mess. I'm looking for the easiest way to fix these gaps. I'm even thinking about just installing threshold seals at the corners so that I can still clean out the garage and manage any water that needs to drain. Any suggestions?
3 Answers
Corner gaps often come from an uneven floor or incorrect seal size. You could try a larger bulb seal or even an offset aluminum retainer that tilts toward the corners. Don’t forget, tweaking the bottom brackets can help drop those corners a little, or you might add short thresholds at the corners and maintain a center drain path for cleaning up.
Have you thought about using a thicker seal without a core? Something like the one I found on Amazon could work well; it might flatten out enough to fill the gaps at the corners but still cover the low spots. Just a thought!
The size of the gap matters. Since the seal attaches to a bracket on the bottom of your door, you might be able to shim it at the ends if it's only about 1/4". Also, if your opener allows it, you could slightly adjust how far down it closes to compress the seal a bit more. If it's a foam core, you could even try removing that if it's not working for you.
I think shims might be the way to go since the gap is minimal. I was hesitant about removing everything because that old seal was a pain to get off, but I might not have a choice. I’ve already pushed the door down as far as it will go, so I don’t think adjusting that will help.

I actually just bought a different one to replace that, and after all the hassle of removing the old one and installing the new, I'm not sure I'm up for that again anytime soon.