No history of flooding or sewer backups existed in her neighbourhood. When she pulled up the old carpeting and underlay, it was dry and in good shape.
Had she hired a professional contractor, likely they would have warned her that a problem-free history doesn’t mean that water seepage won’t ever occur and would’ve recommended a basement subfloor system.
Recently, an accumulation of snow against the house, topped by a good wallop of freezing rain and an ice-blocked downspout from the eavestrough, worked together to trap melting snow and ice so the water couldn’t flow away.

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