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A leaking crack in a basement wall is fixable — and cheaper to fix now than later.
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Many poured concrete walls develop small cracks as they cure. Those cracks often let water in even when they aren't a structural concern.
Leaking cracks in poured walls are commonly sealed by injecting them from the inside. Block walls leak differently — through mortar joints and hollow cores — and usually need a drainage approach.
Cracks that are widening, horizontal, or offset can mean the wall is moving. Have those inspected by a contractor promptly.
Thin vertical cracks in poured walls are common and often only a water concern. Horizontal cracks, stair-step cracks in block walls, or cracks that keep widening can indicate movement and should be inspected.