Foundation Wall Leaks — Crack & Leak Repair in BC

Urgent

Water moving through concrete carries minerals and can corrode reinforcement over time. Seal it before the crack widens.

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Signs you have this problem

A wet streak running down the wall from one point
Water appearing at a visible vertical crack
Damp rings around small round holes — old tie-rod locations
White mineral deposits tracing a path down the concrete
Rust staining or paint blistering in one column on the wall

What usually causes it

Shrinkage and settlement cracks

Concrete shrinks as it cures and settles with the soil. Hairline vertical cracks stay dry until the outside soil saturates, then become a direct path.

Cold joints and tie-rod holes

The seam between footing and wall, and the holes left by the forming ties, are the two most common leak points in Lower Mainland foundations.

Failed or absent exterior damp-proofing

Older homes often have only a thin asphalt spray that has long since broken down, leaving bare concrete against saturated soil.

How it gets fixed

1. Trace the entry point

The contractor follows the wet track and mineral staining back to the source and checks whether the perimeter drain at that elevation is still working.

2. Exterior excavation and membrane

The wall is exposed, cleaned, crack-repaired and sealed with membrane and dimple board, and the drain rock and pipe at the footing are renewed while everything is open.

3. Injection sealing

Where excavation is blocked, polyurethane or epoxy injection fills the crack through its full thickness from inside — effective for isolated cracks and tie-rod holes.

4. Relieve the pressure

Sealing alone can push water to the next weak point, so a working perimeter drain, corrected grading and, where needed, a sump are part of a proper repair.

Foundation Wall Leaks — related work on site

Worker applying exterior waterproofing membrane and dimple board to a foundation wall — Below-grade waterproofing

Excavated foundation trench with new perforated perimeter drain pipe and drain rock — Perimeter drain replacement

Sump pump basin with discharge piping and a high-water alarm — Sump and pump systems

Foundation Wall Leaks — before and after

Real examples of the problem and the finished result after the work is done.

Basement floor with standing water and damp staining along the concrete wall before repair — Wet basement, sealed and drainedSeepage along the footing stopped after waterproofing and a new sump.

The same basement dry and clean with a sealed floor and sump lid after waterproofing — Wet basement, sealed and drainedSeepage along the footing stopped after waterproofing and a new sump.

Old clay perimeter drain tile collapsed and packed with roots and silt in a muddy trench — Failed drain tile replacedRoot-choked clay tile swapped for perforated pipe, filter fabric and clean drain rock.

New perforated perimeter drain pipe in clean drain rock beside a waterproofed foundation wall — Failed drain tile replacedRoot-choked clay tile swapped for perforated pipe, filter fabric and clean drain rock.

How a working drainage system protects a home

Rain runs off the roof, into the leaders, down through drain rock to the perimeter drain, then out to the storm connection or sump — keeping water off the foundation wall.

Services that solve this

Foundation Wall Leaks — quick answer

A foundation wall leak is water entering through a crack, cold joint, tie-rod hole or form-panel seam in the concrete. The repair depends on where the water enters and whether the outside can be excavated: exterior membrane and drainage is the durable fix, while injection sealing works where excavation is not practical.

Key facts

Shrinkage and settlement cracks: Concrete shrinks as it cures and settles with the soil. Hairline vertical cracks stay dry until the outside soil saturates, then become a direct path.
Cold joints and tie-rod holes: The seam between footing and wall, and the holes left by the forming ties, are the two most common leak points in Lower Mainland foundations.
Failed or absent exterior damp-proofing: Older homes often have only a thin asphalt spray that has long since broken down, leaving bare concrete against saturated soil.
DRYHOMEBC covers 14 Lower Mainland and Fraser Valley cities: Vancouver, Burnaby, New Westminster, Richmond, Surrey, Delta, White Rock, Coquitlam, Port Coquitlam, Port Moody, Maple Ridge, Langley, Abbotsford and Chilliwack.
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Foundation Wall Leaks FAQs

Is a leaking foundation crack a structural problem?

Most leaking cracks are shrinkage or minor settlement cracks and are not structural. Cracks wider than about 5 mm, ones that step diagonally, or cracks that keep widening should be assessed by a structural engineer before any sealing work.

Does interior crack injection last?

Properly injected polyurethane fills the full wall thickness and flexes with the concrete, so it holds well on isolated cracks. It does not fix a failed perimeter drain, so if the whole wall is under pressure the leak simply reappears elsewhere.

Can the wall be sealed from outside without replacing the drain tile?

Technically yes, but once the wall is excavated the incremental cost of renewing the drain rock and pipe is small compared with digging again later. Most contractors recommend doing both in one pass.

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Foundation Wall Leaks — Finding the Entry Point and Sealing It Properly