How Many Roof Vents Should I Have

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.

How many roof vents should i have.

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. The size of your roof and attic space will determine how many roof vents you need. Luckily there is a basic formula you can use to determine this.

Squaring the radius is 9 and multiplying it by pi is 28 26. 27 lineal feet required. Hot air exhaust vents located at the peak of the roof allow hot air to escape. 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.

A roof vent is a type of fixture installed on your roof that exhausts hot air. Aside from vents you ll need a handful of 1 1 4 in. We chose rectangular hooded roofing vents and rectangular soffit vents because they re easy to install. Solid vinyl soffit material costs the same as the vented material.

Feet of attic space divided 50 50. Ventsure 4 foot strip heat moisture ridge vent. Cool air enters the attic through soffit vents in the eaves. 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.

Galvanized sheet metal screws for the soffit vents utility knife. Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier. The total nfa of the roof vents you need should be split 50 50 between intake and exhaust. Foot of ventilation for every 150 sq.

Most homes already have some passive attic venting built in. Industry standard for proper attic ventilation recommends for no vapor retarder type of attic insulation no paper plastic or aluminum layer between the attic floor and insulation layer 1 sq. Some local building codes carry special considerations that take precedence. A 6 inch diameter soffit vent would have a 3 inch radius.

Keep in mind you should always consult with a professional roofing company when determining how many air vents your roof should have. Choose one of the following products to meet the recommended exhaust nfva of 528 square inches.