How do I fix this? Is it the spring or something else? ( imgur.com )

Grumpydaddy , 7 months ago

Looks like the concrete falls off on the right.

The gasket at the bottom of your overhead compresses to help create a seal along an uneven surface, but it can only do so much. Your gap may be too large to seal before the door bottoms out completely on the left. That said, there is adjustments that set where the door comes to a stop when closing, check your manual and see if the overhead can lower further.