How Many Roof Vents Does A House Need

Advantages of proper roofing ventilation. 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. Although there are many different types of roof vents to choose from ensuring you have the right number of both intake and exhaust vents is a central part of roof design.

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Rafter vents or insulation baffles install in any rafter space to create narrow gaps that direct fresh air from the soffit vents to the peak of the roof.

How many roof vents does a house need.

As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. For proper cooling and efficient operation any whole house comfort ventilator requires adequate unobstructed outlets in the attic through soffit vents grilles or louvers. Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator. You ll need the square footage of your attic to calculate the number of roof vents that you should need.

Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. For example a 6 by 12 inch soffit vent has 72 square inches which when divided by 144 results in a 0 5 square foot opening. To calculate the amount of attic exhaust area you will need divide the fan s capacity in cfm by 750. 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.

These specialty vents do not affect the. For example if you have 1200 square feet of attic space you should need at least 4 air vents to ensure proper ventilation. Choose one of the following products to meet the recommended exhaust nfva of 528 square inches. 6 measure the radius of round vents or take half the diameter of the.

Keep in mind you should always consult with a professional roofing company when determining how many air vents. Proper attic ventilation offers numerous advantages to the homeowner. Use the calculator below to find out how many exhaust and intake vents you will need on your house.

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