What happens around your foundation during a heavy North York rainfall, and why leaks so often appear during and after storms.
Saturated soil and hydrostatic pressure
When soil around the foundation cannot absorb more water, pressure builds against walls and the floor slab. That pressure pushes water through any available opening.
Storm-related backups
Intense rainfall can also overwhelm municipal systems, which is why backwater valves are worth considering alongside waterproofing.
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