Garage Door Bottom Seal Replacement: before you call

The gap under the door is a finger wide at one end and nothing at the other. The door itself looks straight, but the floor drops away toward the corner where the slab has settled, and drafts pour through the wedge.

Worth answering before the call

Is the door steel, wood, or insulated with a plastic bottom cap? Is the gap even across the door, or worse at one end or in the middle? What is getting in: light, drafts, water, snow, leaves or pests?

Is this something I can do myself?

Many homeowners do, and a technician's value lies in the parts that go wrong: identifying the exact profile so the seal seats, freeing a strip that has fused into its channel, spotting a retainer or door-level problem behind the gap, and resetting the opener's limit and force so the door lands gently and still reverses on an obstruction. If you would rather have it measured, fitted and tested in one go, that is what the visit is for.

How can I tell that the bottom seal needs replacing?

Close the door, turn off the lights and look along the floor from inside. Daylight showing, a strip that feels hard or cracks when pressed, a bulb that has flattened and stays flat, an end hanging out of its channel, chew marks or missing pieces are all signs. So are leaves, snow or a puddle inside the door after weather. Any one of these means the seal has stopped doing its job.