Roof Venting By Roof Sq Footage

Based on your 1100 sq.

Roof venting by roof sq footage.

And this guideline you ll need a minimum of. Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge. Nine hundred square inches equals 6 25 square feet. Ridge static attic vents 384 00 minimum sq.

Of net free area of exhaust needed at or near the ridge. So the ridge ventilation has exceeded the minimum requirement. Standard ridge vent produces 18 square inches of ventilating area per lineal foot. Our passive roof vents are ul certified and rated to withstand wind pressure in excess of 200 mph.

Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space. For the 1 150 attic ventilation requirement simply double the amount of exhaust and intake calculated. For balanced ventilation an equal amount of intake vent area net free area should also be installed. If this is not possible and the homeowner does not have any documentation on file listing attic square footage you could use the footprint of the house aerial view of the house or the number of shingle squares one.

Ideally the attic square footage would be measured at the attic floor length x width regardless of roof pitch by the way. Use avp s roof vent calculator to determine the number and size of exhaust vents you will need.