An ice dam looks like a roof problem and gets sold as one. It is a heat problem that shows up on the roof, and that changes what actually fixes it.
Attic Ventilation and Ice Dams: Why Ohio Roofs Fail Early
Poor attic airflow ages shingles from below in summer and builds ice dams at the eaves in winter. How ventilation works, how to diagnose yours, and the correct fix sequence.
