How Many Roof Vents Should I Have

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 roof vents should i have. Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier. Feet of attic space divided 50 50. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic. Ventsure 4 foot strip heat moisture ridge vent.

Everything you need to begin a how to roof ventilators project is available at home centers. Hot air exhaust vents located at the peak of the roof allow hot air to escape. The total nfa of the roof vents you need should be split 50 50 between intake and exhaust. 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.

Cool air enters the attic through soffit vents in the eaves. Foot of ventilation for every 150 sq. The size of your roof and attic space will determine how many roof vents you need. 27 lineal feet required.

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. Divide that by 144 for a 0 196 square foot opening. Galvanized sheet metal screws for the soffit vents utility knife. 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.

Solid vinyl soffit material costs the same as the vented material. A 6 inch diameter soffit vent would have a 3 inch radius. Attic ventilation requirements how many attic vents your roof needs. A roof vent is a type of fixture installed on your roof that exhausts hot air.

Some local building codes carry special considerations that take precedence. 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. Aside from vents you ll need a handful of 1 1 4 in. Most homes already have some passive attic venting built in.

Squaring the radius is 9 and multiplying it by pi is 28 26. Choose one of the following products to meet the recommended exhaust nfva of 528 square inches.