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Garage Door Not Sealing at Bottom
in Carrollton, TX
The bottom seal on a garage door is a rubber strip that presses against the floor when the door closes. Without a good seal, rainwater runs under the door during storms, and Carrollton gets about 40 inches of rain a year. Bugs and rodents also use that gap to get into the garage, and the broken seal makes the space much harder to cool in summer.
Quick Answer
When a garage door does not seal at the bottom, the rubber bottom seal has cracked, shrunk, or torn away. In Carrollton, heat and UV exposure eat through rubber seals in three to five years. Replacing the bottom seal is straightforward and stops water, bugs, and hot air from getting in. Do it before the next rainy season if you can see daylight under the door.
Telltale Signs
Warning Signs to Watch For
- You can see daylight under the door when it is fully closed
- Water pools on the garage floor after rain
- You find insects or small rodents getting into the garage
- The garage is noticeably harder to cool in July and August
- The rubber strip at the bottom is cracked, brittle, or missing in spots
Root Causes
What Causes Garage Door Not Sealing at Bottom?
UV and Heat Degradation
Carrollton gets intense sun from May through September, and UV light breaks down rubber over time. A seal that faces south or west can harden and crack within three years. Once cracked, the seal no longer presses flat against the floor and gaps open up.
The Fix
Bottom Seal Replacement
The old seal is pulled out of the retainer channel and a new vinyl or rubber seal is slid in. Vinyl holds up better than plain rubber in high-UV areas and should last several years longer.
Uneven Garage Floor
The heavy clay soil under Carrollton homes shifts with wet and dry seasons, and garage slabs move with it. Even small cracks or unlevel spots in the slab mean the seal cannot press flat across the full width of the door. You end up with a good seal in the middle and gaps at the corners.
The Fix
Threshold Seal Installation
A threshold seal is a low rubber strip bonded to the concrete along the door line. It fills in the uneven spots so the bottom of the door has something flat to press against.
Worn Retainer or Door Bottom
The seal attaches to a metal retainer bolted to the bottom of the door. If that retainer is bent or the bottom edge of the door itself is dented, the seal sits crooked. This is common on doors over 15 years old that have taken minor hits over the years.
The Fix
Retainer and Seal Replacement
The bent retainer is removed and replaced with a straight one, and a new seal is installed. If the door bottom is dented badly enough to affect the seal, that bottom panel section is replaced.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | UV and Heat Degradation | Uneven Garage Floor | Worn Retainer or Door Bottom |
|---|---|---|---|
| Cracked or brittle rubber visible along the bottom | |||
| Gaps only at the corners, not the middle | |||
| Seal looks fine but still lets in water | |||
| Water comes in after rain | |||
| Retainer strip visibly bent or crooked |
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