How Many Roof Vents Needed

Proper attic ventilation offers numerous advantages to the homeowner.

How many roof vents needed. A roof vent is a type of fixture installed on your roof that exhausts hot air. Enter square footage calculate or enter the square footage of the attic or area to be vented. Some local building codes carry special considerations that take precedence. 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.

Luckily there is a basic formula you can use to determine this. 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. Advantages of proper roofing ventilation. For example if you have 1200 square feet of attic space you should need at least 4 air vents to ensure proper ventilation.

How many vents will my house need. Keep in mind you should always consult with a professional roofing company when determining how many air vents your roof should have. How many vents do i need. 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.

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. 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. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic.

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