What happens if my Ottawa garage floor epoxy starts peeling after one winter

Dealing with Garage Floor Epoxy Peeling After One Ottawa Winter

If your garage floor epoxy is peeling after just one winter, something went wrong during the preparation or application — a properly installed epoxy system should last 10 to 20 years in an Ottawa garage. The good news is that identifying the cause tells you exactly what needs to happen to fix it permanently. The bad news is that a patch job over peeling epoxy almost never works — the floor typically needs to be stripped and redone correctly.

The most common cause of early peeling in Ottawa is inadequate surface preparation. If the concrete was not diamond ground or shot blasted to achieve a proper concrete surface profile (CSP 2 to 3), the epoxy had nothing to grip. A smooth, troweled concrete surface might feel rough to your hand, but at a microscopic level it is too slick for epoxy to bond. Some DIY kits and even some less experienced contractors rely on acid etching alone, which rarely creates enough profile in Ottawa's dense, machine-finished garage slabs.

The second most common culprit is moisture. Ottawa's high water table and intense spring snowmelt push moisture vapour up through concrete slabs, creating hydrostatic pressure beneath the coating. If a moisture vapour emission test was not performed before application — or if it was and the readings were above 3 pounds per 1,000 square feet per 24 hours — moisture will push the epoxy right off the concrete. This is especially common in older Nepean, Kanata, and Orleans homes where original vapour barriers may have deteriorated.

Temperature-related failures are the third major factor. If the epoxy was applied when the concrete or air temperature was below 10 degrees Celsius, or if the garage dropped below that threshold during the 5 to 7 day cure period, the epoxy never achieved full chemical crosslinking. It may have felt hard to the touch, but the bond to the concrete was compromised. One season of road salt, freeze-thaw cycling, and hot tires is enough to expose that weakness.

Other causes include applying epoxy over previously sealed or painted concrete without fully removing the old coating, contamination from oil or grease that was not properly degreased, and using a thin water-based epoxy product that simply was not durable enough for Ottawa's garage conditions.

To fix the problem properly, the peeling epoxy needs to be completely removed — usually by diamond grinding — and the concrete surface profiled correctly. Any moisture issues need to be addressed with a moisture mitigation primer or vapour barrier system before recoating. Then a proper multi-coat system (primer, 100 percent solids epoxy or polyaspartic, and urethane topcoat) should be applied under the right temperature and humidity conditions. Expect the redo to cost $3,000 to $8,000 for a two-car garage, with the added concrete preparation driving the higher end.

If the original work was done by a contractor, check whether your installation came with a warranty — many Ottawa professionals offer 2 to 5 year warranties covering adhesion failure. If it was a DIY kit, unfortunately the product warranties typically exclude surface preparation issues. For your next go-around, the Ottawa Construction Network directory at justynrookcontracting.com can help you find experienced flooring contractors who understand Ottawa's unique challenges.

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Looking for experienced contractors? The Ottawa Construction Network connects Ottawa homeowners with qualified professionals:

• Luxe Painting and Renovations
• JC Carpentry
• PMC renovations and construction services
• Somar Contracting Inc.
• Floor-2-Wall Inc