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Markham basements are where the family lives — a wet wall means a ruined rec room, not a damp crawlspace. We find the entry point and fix the wall, from inside where we can, from outside where we must.(416) 846-3797Or send the form and we'll call you back.
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Subdivision houses across Milliken, Berczy, Wismer and Cornell sit on poured concrete, and poured concrete cracks in a few predictable places: at the corners of basement windows, under beam pockets, and along cold joints where the pour was interrupted. Most are shrinkage cracks that don't move — but the clay under Markham holds water against the wall, and every spring that water finds the crack. Unionville and Markham Village are a different story: houses from the 1800s and early 1900s on stone or early block, where water comes through washed-out mortar joints along a whole section of wall rather than at one crack, and the fix has to respect a wall that's been standing for 120 years.
We inspect inside and outside — the crack, the grading, the downspouts, where the lot sends its water. A single crack in poured concrete gets injected from inside with a flexible resin that fills it to full depth; no excavation, a few hours, and it moves with the wall as the seasons change. When water is coming through several places, or the wall is block or stone, the durable fix is from outside: excavate, clean, repoint if it's stone, apply membrane and drainage board, and regrade so water runs away from the house. We recommend the smaller repair whenever it will genuinely hold.
Have it looked at when you see a damp patch that returns every thaw, a crack you can fit a coin into, white efflorescence on the concrete, a floor drain that backs up in April, or a musty smell in a finished basement. On a heritage house, damp on the inside of a stone wall after rain is the sign. Small cracks are small jobs; a wet basement left for years is a rebuild.
A vertical hairline crack in poured concrete is almost always shrinkage — a water problem, not a strength problem. A horizontal crack, a stair-step crack through block, or a wall bulging inward is different and needs a look right away. We'll tell you which you have.
Yes. Stone foundations are repointed from outside and waterproofed, not injected — the mortar joints are the path the water takes. It's careful work, but it's how these houses get another century.
Often, yes. Water from a failed roof or an overflowing eavestrough runs down the wall and into the ground right beside the foundation. We check the roof and the drainage before assuming the wall is the problem, because sometimes the wall isn't.
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