Should I remove old stucco before applying new stucco on my Ottawa home?

It depends entirely on the condition of your existing stucco. In many cases on Ottawa homes, you can apply new stucco over old — but only if the existing surface is structurally sound. If it's failing, removing it first is the only responsible approach.

When You Can Go Over Existing Stucco

Applying new stucco over old (called a re-coat or overlay) works when:

• The existing stucco is firmly bonded — tap it with your knuckle across the wall. A solid, consistent sound means good adhesion. Hollow or drum-like sounds mean it's delaminated underneath.
• Cracks are cosmetic only — hairline cracks under 3 mm wide that don't indicate structural movement are fine to coat over after proper prep.
• No moisture problems exist behind the stucco — this is the big one for Ottawa homes. If water has been getting behind the stucco through failed caulking or flashing, the sheathing or lath underneath may be damaged.

For an overlay, the existing surface gets pressure-washed, loose material is scraped off, cracks are filled, and a bonding agent is applied before the new coat goes on. This approach saves significantly — an overlay typically costs $6 to $10 per square foot in Ottawa, versus $12 to $18 per square foot for full removal and replacement.

When You Must Remove the Old Stucco

Full removal is necessary when:

• Large areas are delaminated or bulging — common on Ottawa homes from the 1950s–1970s where original stucco was applied over minimal or no weather barrier
• Water damage has reached the sheathing — soft spots, mould, or rot behind the stucco means everything comes off for repair
• The stucco has been patched repeatedly — multiple layers of inconsistent repairs create a patchwork that won't hold a uniform new coat
• You want to upgrade the drainage system — older Ottawa stucco often lacks a proper rain screen or drainage plane behind it. Removal lets you install modern weather-resistant barriers that meet current Ontario Building Code requirements

Full stucco removal on a typical Ottawa home runs $4,000 to $8,000 just for stripping and disposal, before any new application begins. The debris is heavy — roughly 10 to 12 pounds per square foot for traditional three-coat stucco — so disposal costs add up.

My recommendation for Ottawa homeowners: have a stucco contractor do a moisture assessment and adhesion test before deciding. Many Ottawa-area homes built in the 1960s and 1970s — particularly in Alta Vista, Westboro, and the Glebe — have stucco that looks rough on the surface but is perfectly sound underneath. An overlay in those cases saves thousands and gives you another 25 to 30 years of performance.

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

• Justyn Rook Contracting
• JC Carpentry
• Titley Construction
• Somar Contracting Inc.
• Renovo Construction

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