How Many Roof Vents Should I Have

Cool air enters the attic through soffit vents in the eaves.

How many roof vents should i have.

Choose one of the following products to meet the recommended exhaust nfva of 528 square inches. Aside from vents you ll need a handful of 1 1 4 in. Galvanized sheet metal screws for the soffit vents utility knife. Keep in mind you should always consult with a professional roofing company when determining how many air vents your roof should have.

27 lineal feet required. Most homes already have some passive attic venting built in. Squaring the radius is 9 and multiplying it by pi is 28 26. Some local building codes carry special considerations that take precedence.

A 6 inch diameter soffit vent would have a 3 inch radius. That rule can change if the slope of your roof is more than the average 6 12 slope a rise of six feet for a run of 12 feet because there will be more space heat and moisture to ventilate in the attic. The size of your roof and attic space will determine how many roof vents you need. A roof vent is a type of fixture installed on your roof that exhausts hot air.

Once inside the air heats up and rises higher ultimately exiting through venting at the roof s gables through ridge vents cut into the roof s apex or other vent holes in the roof. We chose rectangular hooded roofing vents and rectangular soffit vents because they re easy to install. Ventsure 4 foot strip heat moisture ridge vent. The total nfa of the roof vents you need should be split 50 50 between intake and exhaust.

If the home already has a fan roof vents or gable vents these should be blocked and sealed from the attic side of the home. Feet of attic space divided 50 50. For example if you have 1200 square feet of attic space you should need at least 4 air vents to ensure proper ventilation. Hot air exhaust vents located at the peak of the roof allow hot air to escape.

Luckily there is a basic formula you can use to determine this. Attic ventilation requirements how many attic vents your roof needs. Everything you need to begin a how to roof ventilators project is available at home centers. Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier.

Foot of ventilation for every 150 sq. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic.