Q: I usually use ridge vent and eaves vent to ventilate the attics in the homes I build. How do you calculate the requirements for that type of system, and do they change when the roof pitch changes?

A: Paul Scelsi, presenter of Air Vent’s “Ask the Expert” seminars, responds: Most of us understand that proper attic ventilation can keep an attic cooler during warmer months, but it also helps to reduce moisture and to keep an attic dry during colder months. Proper attic ventilation can also help prevent destructive ice dams from forming.

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