How Many Soffit Vents Does A Roof Need

Using the previous example if you need 10 square feet of soffit vent space and each vent is 0 89 square feet you need 12 soffit vents.

How many soffit vents does a roof need.

Based on your 1100 sq. They should be divided equally between inlet and outlet vents and they can be used in any combination that will work with your roof s design. So if your attic is 450 square feet you will need 3 square feet of vent space evened out throughout the entire space and divided equally between inlet and outlet vents. As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space.

An attic s intake vents are most commonly installed directly in the soffit either as individual vents spaced every few feet or as one continuous perforated soffit running the entire length of the. Near ridge of the roof. For example you might have to place one soffit vent and one other kind of vent for each 150 sq. Read on to find out how to calculate the amount of vent area needed for your attic.

Divide the soffit vent space needed by the square footage of each vent to calculate how many soffit vents you need. The net free area nfa rating indicates the amount of space each roof vent covers. Measure your attic the building requirements will probably tell you to place a certain number of soffit vents per square foot of ceiling space. 800 558 3414 2020 appleton supply co inc.

Haskell street appleton wi 54914. You will need to have 1 square foot of vent area for every 150 square feet of attic 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. Thus if your attic is 450 square feet you need roof vents equaling 3 square feet.

Choosing round soffit vents for this home means that 8 square feet of required ventilation be divided by 0 196 for about 40 round vents. Copy to clipboard embed product catalog view the asc product catalog soffit calculator calculates exactly how much material you will need where to buy where you can find our products email protected 1905 w. Today s homeowner serves cookies to analyze traffic and better serve you.