How do you repair stucco that has been damaged by ice buildup in Ottawa?

Ice damage is one of the most common stucco problems in Ottawa, and the repair process needs to account for what caused the ice buildup in the first place — otherwise you'll be patching the same spots every spring.

How Ice Damages Ottawa Stucco

When water gets behind or into stucco and freezes — which happens dozens of times each Ottawa winter — the expanding ice pushes the stucco away from the substrate. You'll see bulging sections, hollow-sounding areas when you tap them, chunks that have fallen away entirely, or a network of cracks radiating from the damaged zone. The freeze-thaw cycle in Ottawa (we can swing from -25°C to +2°C within a few days in January) is especially brutal because the repeated expansion and contraction loosens the bond faster than in milder climates.

The repair process typically follows these steps:

• Remove all compromised material — A contractor will chip away stucco until they reach solid, well-bonded material. Leaving any delaminated sections behind means the new patch will fail.- Inspect the substrate and lath — If water has been sitting behind the stucco, the sheathing, building paper, or metal lath underneath may be corroded or rotted. Any damaged components get replaced before new stucco goes on.- Address the water source — This is the step many homeowners overlook. If ice was building up because of a missing kick-out flashing, a clogged gutter, or poor grading that splashes water against the wall, those issues need to be corrected or the damage will return.- Apply new stucco in proper coats — A scratch coat bonds to the lath, followed by a brown coat for thickness and a finish coat for appearance. Each layer needs adequate cure time — at least 48 hours between coats in cool weather.- Match texture and colour — The finish coat is blended and tooled to match the surrounding wall as closely as possible.

For small ice-damage patches (under a couple of square feet), you're typically looking at $300–$600 per repair in Ottawa. Larger sections where the lath or sheathing also needs replacement can run $15–$30 per square foot depending on accessibility and the extent of hidden damage.

Timing matters: stucco repairs in Ottawa should be done when overnight temperatures stay reliably above 5°C — generally mid-May through mid-October. Applying stucco in cold conditions prevents proper curing and sets you up for the same freeze-thaw failure next winter.

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

• Luxe Painting and Renovations
• RenoMotion Inc.
• DC Stucco & Parging
• Valcor Construction
• Demontigny Carpentry

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