Brick repointing: the right mortar for the wall.

Brick walls last because mortar joints absorb the movement that brick cannot. When the mortar fails, recedes, crumbles, or develops cracks, water gets in, freezes, and progressively widens the damage. In Niagara, where temperatures cross 0 degrees Celsius dozens of times each winter, that damage compounds year over year. Repointing seals the joint before the water finds a deeper path.

What a repointing job involves

• Raking to sound depth. Old mortar ground or chiseled out to roughly three-quarters of an inch, or until the joint is solid. Partial scraping leaves no bonding surface for the new mortar.
• Cleaning the joint. Debris blown out and the joint dampened so the new mortar does not lose moisture too quickly into the brick.
• Mortar matched to the brick. The mix is the critical decision. On pre-1960 Niagara stock, a lime-rich mix is correct. On post-1980 brick veneer, standard Portland is appropriate.
• Packing and tooling. Mortar packed in layers on deep joints, finished with a profile that matches the original, usually a concave or weathered joint, to shed water the same way it did when it was built.
• Colour matching. Mix ratios and pigments adjusted to sit close to the original tone. Not identical on an aged wall, but close enough that the repair does not read as a patch.

What needs repointing vs. what can wait

Hairline surface cracks in otherwise solid mortar are weathering, not structural failure. Mortar that is visibly recessed more than a few millimetres, that crumbles out with light pressure, or that shows water staining behind it is due. A full face will not all go at once. Ask the contractor to assess each elevation and prioritize what is actively admitting water.

Niagara freeze-thaw note: St. Catharines sees Lake Ontario moderation rather than the deep cold of inland Ontario, but it crosses 0 degrees Celsius repeatedly through late fall into early spring. Repeated crossing is what damages mortar, not sustained cold. Any open joint on a north or west face should be assessed before it becomes a second winter in.

What repointing costs in St. Catharines

No verified Niagara or Ontario figure for what this work costs exists in any government, association, or other authoritative source, so this guide publishes none. The way to learn what your job costs is a written, itemized quote from a local masonry contractor (there is no provincial licence for this trade) and a second one itemized the same way so the two can be compared line by line.