Why garage doors fail in an Ontario winter

3. Grease that has turned into glue

Hinges, rollers and bearings that were lubricated with the wrong product, or that have not been touched in years, get noticeably stiffer below about minus ten. The door drags, the opener works harder, and the force setting that was fine in October now trips. People often read this as "the opener is dying".

What to do: clean and re-lubricate the moving parts per the door manufacturer's instructions. DASMA lists lack of counterbalance maintenance as a factor that shortens spring life, and says regular greasing or lubrication of springs as required by the manufacturer helps maximise cycle life. Do not grease the track: grease in the track collects grit and makes rollers drag, which is the opposite of the goal.

4. Steel that shrinks, and a door that bows

Insulated bonded-core sections bow when the two skins are at different temperatures, because the warmer skin grows relative to the cooler one. DASMA states plainly that thermal bowing "is an inherent characteristic on garage doors with insulated bonded core sections and is not considered a product defect", and notes something people find counterintuitive: it is not always outward. In a cold winter environment, a heated garage can make the door bow inward.

Worth fixing: usually not, in the sense that a small seasonal bow on an insulated door is normal and reverses. It matters when it is large enough to stop the door sealing or to make it bind in the track, which is a reinforcement question rather than a repair.

5. Condensation, ice on the glass, and water on the floor

A garage with a warm, snow-covered car in it is a humid garage. DASMA describes condensation as characteristic of "a warm, humid garage and a cooler garage door surface due to a colder exterior temperature", names a wet or snow-covered car, a humidifier and an adjacent laundry area as sources, and states that "even double or triple pane glazing units may experience condensation in humid garages".

Its recommendations are the practical ones: maintain proper garage ventilation to control humidity, reduce the garage air temperature in extreme cold, follow the manufacturer's guidance on cleaning products for glazing, and keep tight seals around the glazing perimeter and door sections. It also warns to take care if scraping ice off the glass mechanically.

One distinction worth knowing: condensation on the surface of the glass is normal. Fogging between panes is different, and DASMA notes it may indicate a glazing seal failure in a double-pane unit. Because garage door glazing is usually integrated into the section rather than removable, that can mean a section replacement rather than a glass swap.

6. Sensors blinded by frost and low winter sun

Two seasonal faults show up together. Frost and condensation form on the sensor lenses overnight, so the receiver cannot see the beam and the door refuses to close. And the low winter sun sits directly on the receiver in the late afternoon, washing out the signal.

What to do: wipe both lenses with a dry cloth, check both LEDs are steady, and confirm nothing is in the beam. Do not raise the sensors to get around the problem: DASMA specifies the beam must be no higher than six inches above the floor. Detail on the sensor guide.

7. Salt, on everything, for four months

This is the one that is specific to living on the QEW corridor rather than to Ontario generally. Brine from the highway comes home on the car and drips onto the slab right where the bottom of the door, the bottom brackets and the lowest few inches of lift cable live. DASMA names corrosive environments as a spring-life factor in their own right.

The visible result, a few winters in, is fuzzy-looking cable near the bottom bracket and rust blooming along the bottom section from the inside out. Both are cheap to catch early and expensive to catch late.

Worth doing: rinse the bottom of the door and the slab inside the door line on a mild day in February. It sounds trivial. It is the single highest-value thing a homeowner on this corridor can do for their door.

The autumn checklist

1. Look at the springs for rust, pitting and any gap in the coil.
2. Look at the bottom few inches of both cables for fraying or corrosion.
3. Check the bottom seal is intact and still flexible, and replace it before it freezes rather than after it tears.
4. Clear grit out of the track and re-lubricate hinges, rollers and bearings per the manufacturer.
5. Run the balance test: opener disconnected, door lifted to waist height, released.
6. Run both safety tests, the beam and the contact reversal.
7. Make sure the slab inside the door line drains rather than ponds.

Everything on that list is either something you can do or something on the annual tune-up.