Garage door has a gap at the bottom when closed?
A gap under a closed garage door is usually a worn or shrunken bottom weather seal, an uneven or sloped floor, or an opener down-travel limit set too high. A new bottom seal or threshold solves most cases.
A gap under a closed garage door is usually a worn or shrunken bottom weather seal, an uneven or sloped floor, or an opener down-travel limit set too high. A new bottom seal or threshold solves most cases.
Common Causes
- 1 Worn, cracked, or shrunken bottom rubber seal (astragal)
- 2 Uneven or sloped concrete floor leaving a gap on one side
- 3 Opener down-travel limit set too high, stopping the door short
- 4 Bent or damaged bottom section of the door
- 5 Worn or off-track rollers letting the door sit unevenly
What to Check First (DIY)
- Inspect the bottom seal for cracks, gaps, or hardening, it is the most common cause
- Watch where the gap is, an even gap points to the seal or limit; a one-sided gap points to the floor or door
- Check the opener down-limit if the door stops just short of the ground
- Measure the gap so a pro can recommend the right seal or threshold
When to Call a Pro
If a new bottom seal does not close the gap, the floor may need a threshold seal, the opener limit re-set, or the bottom section straightened, a pro can match the right fix and keep the safety reverse correct.
Frequently Asked Questions
Why is there a gap under my garage door?
Most often the rubber bottom seal has worn out or shrunk. Replacing it is inexpensive. A one-sided gap usually means an uneven floor or a door sitting crooked, which may need a threshold seal or roller/track work.
Can a gap let pests and water in?
Yes, even a small gap lets in rain, leaves, dust, and rodents. A fresh bottom seal (and a threshold seal for uneven floors) keeps the garage tight.
How much to fix the gap under my door?
A bottom-seal replacement is a low-cost service-call fix; a threshold seal or limit/roller adjustment runs $95 to $250. We confirm after seeing the gap.
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