How Many Roof Vents Needed

The size of your roof and attic space will determine how many roof vents you need.

How many roof vents needed.

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. Keep in mind you should always consult with a professional roofing company when determining how many air vents your roof should have. A roof vent is a type of fixture installed on your roof that exhausts hot air. Proper attic ventilation offers numerous advantages to the homeowner.

Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic. Hot air exhaust vents located at the peak of the roof allow hot air to escape. 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. Other types there are also several other types of roof vents including dome or box shaped vents that run through the roof itself.

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. 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. 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.

Advantages of proper roofing ventilation. Enter square footage calculate or enter the square footage of the attic or area to be vented. Luckily there is a basic formula you can use to determine this. The ideal roof attic ventilation would consists of combination of vents located in upper section of the attic ridge vents turbine box shaped or dome static vents electric motor powered vents vents installed along the bottom parts of the roof overhang called intake or soffit vents hip vents and or gable vents all of the provided.

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. The general rule of thumb in these situations is of roughly one vent per every 300 square feet of attic area if the attic has a vapor barrier.