The most common reasons North York basements leak — from foundation cracks and grading to weeping tile failure — and what to do about each.
Water follows the easiest path
Basement leaks are rarely random. Water moves toward the lowest-resistance path, and in most North York homes that path is created by grading, drainage, or an opening in the foundation.
Understanding which of these is responsible is the first step in any lasting basement leak repair.
Foundation cracks and cold joints
Poured concrete foundations develop shrinkage cracks as they cure and settle. Block foundations leak through mortar joints. Both allow water in when the surrounding soil is saturated.
Grading and downspouts
Soil that slopes back toward the house, or a downspout discharging within a metre of the wall, can put hundreds of litres against the foundation during a single storm. These are often the cheapest problems to correct.
Failed weeping tile
Older clay or perforated tile can silt up, crush, or fill with roots. Once it stops draining, water sits against the footing and pressure builds until it finds a way inside.
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