Water coming in now? Start here

Wall cracks

Water through a foundation wall crack

Water following a line down a poured concrete wall in a Burlington basement is often coming through that crack. Sealing one isolated crack from inside can be the right repair. If the wall is wet beyond that line, the wall is block or stone, or water shows up only after the ground is saturated, the crack is probably not the whole problem. Someone has to see the wall before a method is chosen.

Possible causes

  • An isolated crack in poured concrete
  • Hydrostatic pressure after rain or snowmelt
  • Wet wall beyond the crack, which points past injection

Repairs that are usually considered

Injection ports bonded along a vertical crack in a poured concrete wall

Crack repair

Seals an isolated crack in poured concrete.

Fits when water tracks down one line in poured concrete and the rest of the wall stays dry.

Foundation wall coated with waterproofing membrane, drainage board, and clear stone at the footing

Exterior waterproofing

Stops water at the outside of the wall.

Fits when seepage is wider than the crack, or the wall is block, stone, or saturated soil.

When to call

Flowing water, a sewage smell, or water near outlets or the electrical panel needs same-day help. A damp line that shows up after rain should be looked at before the next storm.

This is guidance, not an inspection.

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Part of the Waterproof Ontario network

This city site diagnoses locally and sends completed requests directly into the Waterproof Ontario matching network.

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