Garage Doors

Garage Door Frozen Shut? How to Free It Without Tearing the Seal

It's minus 20, you're late, and the door won't go up. The opener grinds, the door lifts an inch at one side, then stops and reverses. Last night's slush has frozen the bottom seal to the concrete.

This is one of the most common winter calls we get, and most of the time nothing is broken yet. What happens in the next few minutes decides whether it stays that way.

Stop pressing the button

The opener isn't built to break ice. When the door won't move, the opener reaches its force limit and stops or reverses. That's the safety system working. Pressing again and again puts the full pull of the motor on a door that's glued down at the bottom. Something gives, and it's usually not the ice.

What gives, in the order we tend to see it:

• The bottom seal tears off the door or out of its retainer.
• The opener's drive gear wears or strips.
• The top section flexes where the opener arm pulls on it, and on thin steel doors it can bend.
• A cable slips if one side breaks free before the other and the door lifts crooked.

So: one try. If it doesn't open, stop.

Freeing a frozen door

First check that it really is ice. Look along the bottom edge from outside or inside. You'll usually see the rubber seal pressed into a ridge of ice or frozen slush along the slab. If the door looks crooked, a cable is hanging, or there's a gap in the spring above the door, this isn't a frozen door. Leave it and call.

If it is ice:

1. Unplug the opener, or at least stop using it.
2. Clear the ice along the seal gently. Use a plastic scraper or a flat plastic shovel edge, working along the floor rather than prying up under the seal. Metal tools and chisels cut rubber.
3. Use warm water if scraping isn't enough. Warm tap water poured along the frozen line loosens the bond. Don't use boiling water. It adds more water to refreeze, and very hot water on a frozen seal and slab does more harm than good.
4. A hair dryer or heat gun on low works for small spots. Keep it moving and keep it well back from the rubber and the paint.
5. Open the door once it's free, then clear and dry the strip of floor under it. Water left there refreezes the moment the door comes down.

The door manufacturer Clopay gives the same basic advice: don't force a frozen door, chip away gently or melt the ice with warm water, then raise the door and dry the area so it doesn't refreeze.

What not to use

• Rock salt piled against the door. Salt eats steel and the hardware at the bottom corners, and it's already arriving on every car tire all winter. Salt the driveway, not the door.
• A shovel or ice chipper wedged under the seal. That tears the rubber and can bend the bottom edge.
• Forcing the door up by hand. The seal tears the same way, and you're pulling against spring tension you can't see.
• Turning up the opener's force setting. Raising it to break the ice defeats the part of the system that makes the door reverse when it hits something.

Why garage doors freeze to the floor

The bottom seal is a strip of rubber or vinyl that presses against the slab. Its job is to close the gap, and that means it's always sitting in whatever reaches the threshold. Several things put water there.

Slush off the car

The biggest source by far. Snow and slush packed around the wheel wells melt in the garage overnight and run toward the lowest point. On many slabs, that's the door.

Snow against the outside of the door

A plow ridge or a drift banked against the door melts in afternoon sun and refreezes at night along the seal line.

Freezing rain and quick thaws

When rain falls on a cold slab, or a thaw is followed by a hard freeze, the bottom seal can be locked down in a few hours. Freezing rain can also coat the tracks and the sensor lenses.

A worn or cracked seal

A seal that has hardened and cracked holds water in the cracks and grips the ice harder. A seal with gaps lets water run under the door from outside.

A slab that slopes the wrong way

Some garage floors slope toward the door, and some driveways slope toward the garage. Either way, water collects at the threshold.

What cold does to the rest of the door

Ice at the threshold isn't the only winter problem. A door that's harder to open in January may have one of these instead, or as well.

• Thickened lubricant. Grease and oil stiffen in the cold, and a door that ran smoothly in the fall starts to drag. Clopay recommends a silicone-based lubricant and warns against WD-40 on garage doors. It also advises against lubricating nylon rollers.
• Remote batteries. Cold weakens batteries. If the wall button works and the remote doesn't, try a fresh battery before anything else.
• Frost or ice on the sensors. Photo-eye lenses near the floor can frost over or get splashed with slush. The opener reads that as something in the way and refuses to close.
• Springs near the end of their life. Cold doesn't break healthy springs, but springs that were already close to failing often go on the first hard cold snap. A loud bang from the garage on a frigid morning is a common way people find out.

If the door is heavy even after it's free of ice, or it lifts unevenly, the problem is the spring or cable, not the frost. Our article on broken garage door spring signs shows what to look for.

Stopping it from happening again

Most of this is cheap and done in the fall.

• Check the bottom seal. If it's cracked, flattened, torn or missing in spots, replace it. A soft, intact seal sheds water and lets go of ice more easily.
• Treat the seal. A light coat of silicone spray on the bottom seal helps keep ice from bonding. Clopay suggests this too.
• Keep a clear strip. Shovel the few inches in front of the door after each storm, and don't leave a plow ridge against it.
• Deal with the slush. Knock the snow off the wheel wells outside, or squeegee meltwater away from the door before it freezes.
• Look at the side and top seals while you're at it. Worn side weatherstripping lets drafts and blowing snow in along the jambs.
• Clean the sensor lenses when you see slush on them.

If you'd rather have it done in one visit, a fall tune-up covers the seals, lubrication, balance and a check of the springs and cables before the cold arrives. We handle that under garage door repair and maintenance.

When a frozen door turns into a repair

Call if any of these happen:

• The bottom seal has torn away from the door or the retainer.
• The opener grinds or runs without moving the door after the door is free. The drive gear may have stripped while it was pulling against the ice. That's a job for opener repair.
• The door rises crooked once it's free. One cable may have slipped while one side was stuck.
• The bottom section is bent or pulled away from its hinges.
• The door is stuck open in the cold and won't come down. That's a security problem and a heating problem, and it's a reason to call for emergency garage door service.

Common questions

Can I use de-icer on the seal?

Clopay lists a commercial de-icer as one option for thawing a frozen door. Use it on the ice along the threshold, keep it off painted steel as much as you can, and rinse the area once the door is free. Avoid dumping rock salt against the door.

Why does the door freeze on one side only?

Usually because water collects on that side, from a slope in the floor or the car always parked in the same spot. That uneven bond is also why a door can lift crooked and pull a cable off its drum when one side breaks free first.

Will a heater in the garage stop it?

It helps on the inside edge. It can also make things worse if the heat melts snow off the car that then runs under the door and freezes outside the seal line. Keeping water off the threshold does more.

Should I leave the door open a crack overnight?

No. It lets cold and snow into the garage, it's not secure, and the door can still freeze in that position.