Roof Venting Ratio

There should also be a 50 50 balance of attic venting and roof venting. The ratio of soffit intake to roof outlet should be at least 2 1 to avoid unnecessary these heat losses from the building. In order to find the right calculator divide the attic floor space by 300 sq feet.

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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.

Roof venting ratio.

1 square foot of net free vent area nfva per 150 feet of attic floor. Near ridge of the roof. Based on your 1100 sq. If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation.

A serious error is a roof outlet vent net free area that exceeds the air inlets at lower roof edges or eaves. 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. 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. 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.

1 square foot of nfva per 300 square feet of attic floor if a vapor barrier is installed on the ceiling below. And this guideline you ll need a minimum of.

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