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Ice Damming & Condensation
How is Ice damming occurs?

As the use of attic insulation increased, ventilation proved valuable in controlling another problem, ice damming. Ice damming occurs when certain areas of the roof become warmer than others, causing a thaw- freeze cycle that allows accumulated snow to melt, then re-freeze on colder portions of the roof. This re-freezing creates an ice dam that works its way under shingles only to later melt and create roofing leaks. Ventilation ensures the roof deck temperature remains consistently cold so ice damming cannot start.

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