How Many Soffit Vents Does A Roof Need

8 perform similar calculations for the roof and ridge vents.

How many soffit vents does a roof need. As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. 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. Near ridge of the roof. 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. The net free area nfa rating indicates the amount of space each roof vent covers. Today s homeowner serves cookies to analyze traffic and better serve you.

Read on to find out how to calculate the amount of vent area needed for your attic. 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. Measure your attic the building requirements will probably tell you to place a certain number of soffit vents per square foot of ceiling space. And this guideline you ll need a minimum of.

Divide the soffit vent space needed by the square footage of each vent to calculate how many soffit vents you 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. 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. 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.

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. Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. 800 558 3414 2020 appleton supply co inc.