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.

How many roof vents does a house need.

Choose one of the following products to meet the recommended exhaust nfva of 528 square inches. These specialty vents do not affect the. Advantages of proper roofing ventilation. Keep in mind you should always consult with a professional roofing company when determining how many air vents.

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. 6 measure the radius of round vents or take half the diameter of the. 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. For example if you have 1200 square feet of attic space you should need at least 4 air vents to ensure proper ventilation.

Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. You ll need the square footage of your attic to calculate the number of roof vents that you should need. 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. 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.

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. Use the calculator below to find out how many exhaust and intake vents you will need on your house. Proper attic ventilation offers numerous advantages to the homeowner.