When wet ground freezes it can lift the soil and the slab on top of it, and when it thaws things settle again. That changes the gap between the floor and the bottom of your garage door. Watch for a door that scrapes, leaves a gap, or sticks to the floor, and have it checked.
Quick answers
Can freezing ground affect a garage door?
Yes, indirectly. Fine Homebuilding says freezing water in soil can lift the soil and anything resting on it. A slab that rises or settles changes how the door meets the floor.
Why is there a gap under my garage door after winter?
The seal may be worn, or the slab may have moved. If the gap is uneven from one end to the other, the floor is the likely cause and a new seal will not fix it.
Can a garage door be adjusted if the slab moved?
Small changes can be handled with the opener limits or a different bottom seal. Larger movement needs the floor corrected first.
Why does my garage door stick to the floor after a thaw?
Melt water refreezes under the bottom seal and bonds it to the concrete. Free it gently, dry the area and check the seal for damage.
The full explanation
What a freeze-thaw cycle is
A freeze-thaw cycle is simple: water in the ground or in cracks freezes, then melts, and the pattern repeats as the temperature moves above and below freezing. Fine Homebuilding explains that water expands by about 9 percent as it turns to ice. When it happens in soil, ice can build up in layers and push whatever rests on the soil upward.
In a region where winter swings between cold nights and milder days, a garage slab and the driveway apron in front of the door can move a little from one season to the next. Most of the time the movement is small. It matters to a garage door because the door closes onto that floor.
Why the door notices first
Fine Homebuilding says frost heave needs three things at once: soil that holds moisture, water, and cold that reaches below the surface. Cold alone does not cause it. A garage door sits at the edge of the slab, where drainage, a driveway and the foundation all meet, so small changes show up there.
Think about the geometry. A garage door seal is designed to touch the floor evenly along its whole width. If one end of the slab rises or settles, the seal presses hard on one side and leaves a gap on the other. The door itself can still move perfectly well.
Signs the floor or ground has moved
- The bottom seal is crushed on one side and open on the other.
- The door stops short of the floor, or the opener reverses before it touches.
- New cracks run across the slab or the driveway apron near the door.
- Water pools at the door after rain, where it did not before.
- The door sticks to the floor after a thaw and refreeze, which is a seal issue rather than a heave issue.
Seals and ice after the thaw
Melt water that runs toward the door can refreeze overnight and tie the bottom edge to the concrete. Clopay says this is common when the bottom weather seal sits in water or wet snow. Its advice is to chip the ice gently or use warm water, raise the door, then clean and dry the area so it does not freeze again.
Do not pull hard on a frozen door. See how to free a frozen door safely for the steps.
If the slab has heaved or sunk, a new seal only hides it. A concrete or foundation contractor should look at the floor. Check with your city building department and your HOA documents before changing drainage or the apron outside the door.
What the door and the opener can do about it
A door that lands unevenly on a floor can be adjusted in small ways. A technician can reset the opener's down limit, swap the bottom seal for one with a taller bulb, or straighten a bent track if the movement has racked the door. Those fixes work for small changes. For larger movement, the floor has to be corrected first.
See garage door repair for what we check on a door that drags, leaves a gap or reverses on the way down. If the bottom seal is torn or flat, replacing the bottom seal is the first step.
Who to call
Emil Garage Doors repairs garage doors, springs, cables and openers and installs new doors in Illinois, including Arlington Heights, Aurora and Joliet. Send your details and a photo of the gap under the door, and we book the soonest visit. We will say in plain words whether the problem is the door or the floor.
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