How Many Roof Vents Do I Need In My Roof

And this guideline you ll need a minimum of.

How many roof vents do i need in my roof.

The net free area nfa rating indicates the amount of space each roof vent covers. For the number of soffit vents in the example divide 8 square feet of ventilation needed by 0 5 for the number of rectangular vents required 16 in the example. Near ridge of the roof. Intake vents located at the lowest part of the roof under the eaves allow cool.

Based on your 1100 sq. The key to proper ventilation of your roof and attic is balance. You ll need the square footage of your attic to calculate the number of roof vents that you should need. Use the calculator below to find out how many exhaust and intake vents you will need on your house.

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. Always have a balanced ventilation system. As a general rule your roof needs 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.

Always have a balanced ventilation system. Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation for every 300 square feet of attic floor space evenly split between intake and exhaust. The amount of space you devote to intake must be equal to the amount you allow for exhaust and these must be calculated according to the size of your attic and slope of your roof. Choosing round soffit vents for.

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. In no case should the amount of exhaust ventilation exceed the amount of intake ventilation. 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. 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.