How To Figure Out 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. 1 cubic foot is 12 x 12 144 cubic inches. In order to find the right calculator divide the attic floor space by 300 sq feet.

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Next multiply the 4 square feet into cubic inches.

How to figure out roof ventilation.

Measure the length and width of the attic floor space to be ventilated. Enter square footage calculate or enter the square footage of the attic or area to be vented. Use our easy 3 step attic ventilation calculator to determine your attic square footage and ventilation needs. Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator.

If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation. Our soffit vents round back vents pop vents and universal vents make excellent intake vents. For balanced ventilation an equal amount of intake vent area net free area should also be installed. 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.

Use avp s roof vent calculator to determine the number and size of exhaust vents you will need.

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