Improper roof ventilation can lead to poor air circulation, an overworked HVAC system, mildew and mold growth, or a buildup of ice dams in cold climates. Active roof vents harness wind with either ...

How to determine whether you need better attic ventilation. In the summer, good attic ventilation reduces heat buildu ...

They’re typically installed on the peak of the roof because the ridge line is often where warm air collects, but there are also off-ridge vents. Ridge vents come with or without baffles.

When outdoor air is less humid than attic air, ventilation can also help reduce moisture buildup in the attic. There are two ways to vent a roof: by venting the attic, which is most common ...