Foundation Services
Parging & Foundation Restoration in Ottawa — Done So It Doesn't Peel Next Spring.
Most parging in this city fails the first winter. Here's how we do it differently. Stacy Provost has been fixing Ottawa foundation parging for 40+ years.
The problem
Why most parging fails in Ottawa.
Drive any street in Ottawa and you'll see it: foundation parging that's peeled off in sheets, blistered like sunburned skin, or crumbled away at the bottom. Most of it was applied within the last few years.
The reason it failed isn't bad luck or bad weather — it's bad application. Three things go wrong:
- Wrong mix. Standard mortar mix doesn't survive Ottawa's freeze-thaw cycles. Parging needs a mix designed for the temperature swings here, with the right additives.
- Wrong prep. Parging applied to a dirty, dusty, or improperly wetted surface won't bond. The first freeze pulls it right off.
- Wrong season. Parging applied in late fall, when the wall is cold and the cure is incomplete before the first frost, fails by spring. Same for parging applied in summer heat without proper moisture control.
The right approach takes patience and gets the small things right. We do it that way because we've been doing parging in this city for forty-plus years and we've watched what happens to the work that wasn't done that way.
How we do it
The right mix and the right prep.
Our parging starts before any mortar gets mixed:
- Surface inspection — we look for cracks behind the existing parging that need addressing before we cover them up. Parging over a structural crack is a band-aid that fails.
- Full removal of failing existing parging, back to sound substrate.
- Cleaning with proper bonding agent or pressure wash + brush.
- Substrate wetting so the new mortar doesn't lose its water to a dry wall.
- Right mix for Ottawa conditions, typically a Type S mortar with the appropriate additives.
- Two-coat application for thicker repairs — not single-pass over an uneven surface.
- Proper cure time before any sealer or paint goes on.
Most of this is invisible once the work is done. It's also the difference between parging that lasts 15–20 years and parging that fails in 18 months.
When parging is cosmetic vs. when it signals a structural issue.
Sometimes the failed parging is just failed parging — bad application by whoever did it last, fix it and move on. Sometimes the failed parging is telling you something deeper:
- Vertical cracks behind the parging can mean a foundation crack that's been hidden.
- Bulging or bowed parging can mean a wall that's actually moving.
- Persistent moisture coming through new parging can mean a drainage problem.
We look for these signs during the inspection. If your parging problem is actually a foundation problem, we'll tell you and walk you through the right scope.
Full foundation restoration — when it's worth it.
Beyond standard parging, we also do full foundation restoration on older Ottawa homes — particularly century homes with rubble-stone or block foundations. This involves repointing, structural patching, and sometimes partial rebuild of damaged sections.
Restoration is more involved and more expensive than parging, but for the right house — especially heritage homes — it's the only approach that works long-term.
What it costs.
| Service | Typical range |
|---|---|
| Standard parging (whole-foundation re-coat) | $15–$30 per sq ft ($2,000–$6,000) |
| Spot parging repair | $400–$1,200 |
| Foundation restoration (heritage/structural) | $5,000–$25,000+ |
What changes the number: Square footage of foundation, whether structural repairs are needed, heritage considerations, season of work.
Best time of year to schedule.
Parging is a weather-dependent job. The ideal window in Ottawa runs roughly late May through early October — temperatures consistently above 5°C, no frost in the forecast, time for full cure before winter.
We can sometimes work outside this window with cold-weather techniques (heating, additives, tarps) but it adds cost and risk. If your parging isn't an emergency, we'd usually rather book you for the right season than rush a bad job.
Real work
Foundations that haven't failed.
“I'd had parging fail twice before with other contractors. Stacy came, explained the whole thing, and his crew prepped properly, used the right mix, and did it at the right time. Three years now, no peeling.”
“We had a 120-year-old stone foundation that was crumbling. Not just cosmetic — it was actually failing. Stacy did restoration work, not just parging. It looks great and we know the real problem is fixed now.”
“After seeing parging peel off three other houses on the street, I was skeptical. Stacy walked the house with me, showed me what the other guys had done wrong, and explained his approach. It's been solid for two seasons now.”
Related work.
Parging often runs alongside other foundation work — see foundation crack repair if you have visible cracks, or basement waterproofing if water is reaching the wall behind the parging. The cost guide has parging ranges.