As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space.
How many soffit vents does a roof need.
8 perform similar calculations for the roof and ridge vents.
Read on to find out how to calculate the amount of vent area needed for your attic.
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Measure your attic the building requirements will probably tell you to place a certain number of soffit vents per square foot of ceiling space.
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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.
Divide the soffit vent space needed by the square footage of each vent to calculate how many soffit vents you need.
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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.
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Thus if your attic is 450 square feet you need roof vents equaling 3 square feet.
The net free area nfa rating indicates the amount of space each roof vent covers.
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.
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.
Near ridge of the roof.
And this guideline you ll need a minimum of.
Based on your 1100 sq.
For example you might have to place one soffit vent and one other kind of vent for each 150 sq.
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.