Many homeowners overlook the importance of proper ventilation when constructing a roof or overseeing a roof repair. Brian Ray from Owens Corning Roofing explains the ABC’s of Ventilation: Ample ventilation; Balance of cool, dry air intake with stale moist exhaust; and Control of the air leakage into the attic from the conditioned living space below. He gives tips on how to check for an adequate ventilation system and explains how rust or abnormal heat in the attic can be indicators of poor ventilation and poor indoor air quality. Additionally, he defines ice damming and the potential effects it can have on the structural materials of a roof. Homeowners should check intake vents to make sure they are not blocked with insulation or by paint. The National Network of Owens Corning Roof Contractors makes it easy to find a professional in your area.