How Many Roof Vents Should I Have

Attic ventilation requirements how many attic vents your roof needs.

How many roof vents should i have.

27 lineal feet required. Luckily there is a basic formula you can use to determine this. 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. Galvanized sheet metal screws for the soffit vents utility knife.

Some local building codes carry special considerations that take precedence. Solid vinyl soffit material costs the same as the vented material. The size of your roof and attic space will determine how many roof vents you need. Squaring the radius is 9 and multiplying it by pi is 28 26.

Ventsure 4 foot strip heat moisture ridge vent. Foot of ventilation for every 150 sq. 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. Divide that by 144 for a 0 196 square foot opening.

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. A 6 inch diameter soffit vent would have a 3 inch radius. We chose rectangular hooded roofing vents and rectangular soffit vents because they re easy to install. The total nfa of the roof vents you need should be split 50 50 between intake and exhaust.

Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic. 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.

Keep in mind you should always consult with a professional roofing company when determining how many air vents your roof should have. Feet of attic space divided 50 50. 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. Most homes already have some passive attic venting built in.

A roof vent is a type of fixture installed on your roof that exhausts hot air. Everything you need to begin a how to roof ventilators project is available at home centers.