# How Many Static Roof Vents Do I Need? [SOLVED!]

Ok, you get you need them 😊 But how many roof vents does one home really need? If your roof has a vapor barrier or is more than 300 sq. Feet, homeowners should have one square foot per roof vent. For every 150 square feet of space, you will need one square foot (or 1:150) of roof vent 😎 Your roof vents must be evenly divided with one-half dedicated to air intake, and the other half for exhaust 😉 A 2,400-square foot home would be considered a 2.400 sq. Ft. Home with a roof that has a moisture barrier would need 8 feet roof vent [1]
Let’s go through an example… For a home with 2000 square feet of attic floor space, you’ll first divide 2000 by 300 (2000 / 300 = 6.66). There are 6.66 square feet worth of attic ventilation. You want to create an even system so divide the area by 2, so half of your ventilation will be intake and half will be exhaust. So 6.66 divided with 2 equals 3.33 square footage of attic ventilation to provide intake and 3.33 for exhaust. You will have to convert the square footage required into square inches because vents come in square inch ratings. You do this by multiplying the recommended square footage by 144. So, 3.33 x 144 equals 480 square feet of attic ventilation. Eilene Ryder deserves a special thanks for her amazing insight. [2]