An ice dam is a ridge of ice at a colder roof edge that traps melting snow. Heat escaping from the home can warm the upper roof while the eaves remain below freezing, creating repeated melting and refreezing. An ice dam alone does not prove shingle failure; recurring ice and any water entry need assessment of both roof and attic conditions.
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Arrange prompt evaluation before winter for an active leak, missing shingles, exposed materials, or a worsening roof condition. Waiting until spring may be reasonable for a concern a qualified professional has assessed as stable, with written warning signs and follow-up timing. Roof age or a small stain alone cannot settle the decision.
Check roof covering, gutters, flashing areas, and indoor moisture before the first freeze. Missing shingles, recurring overflow, or a new ceiling stain should be evaluated before snow hides the area. A ground-level checklist can reveal changes, but it cannot confirm hidden conditions or guarantee a leak-free winter.
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