How Many Soffit Vents Does A Roof Need

Measure your attic the building requirements will probably tell you to place a certain number of soffit vents per square foot of ceiling space.

How many soffit vents does a roof need.

Divide the soffit vent space needed by the square footage of each vent to calculate how many soffit vents you need. Today s homeowner serves cookies to analyze traffic and better serve you. Based on your 1100 sq. 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.

As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. For example you might have to place one soffit vent and one other kind of vent for each 150 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. 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.

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. 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. 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. 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.

8 perform similar calculations for the roof and ridge vents. Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. Read on to find out how to calculate the amount of vent area needed for your attic. Near ridge of the roof.

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. And this guideline you ll need a minimum of. You will need to have 1 square foot of vent area for every 150 square feet of attic space.