Roof Venting Ratio

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. There should also be a 50 50 balance of attic venting and roof venting.

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And this guideline you ll need a minimum of.

Roof venting ratio.

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

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

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. 1 square foot of nfva per 300 square feet of attic floor if a vapor barrier is installed on the ceiling below.

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