How Many Vents Should A Roof Have

It should be noted that these vents which expel warm moist air from the bathroom and food prep areas of the home need their own ducts and vent hoods which direct air to the home s exterior.

How many vents should a roof have.

Luckily there is a basic formula you can use to determine this. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic. Hot air exhaust vents located at the peak of the roof allow hot air to escape. Divide that by 144 for a 0 196 square foot opening.

You ll need the square footage of your attic to calculate the number of roof vents that you should need. Even if you have vents in your roof you still need to have soffit vents to allow the air to circulate naturally. 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. These vents and ducts should never share space with the roof vent and air should never be vented directly into the attic.

The size of your roof and attic space will determine how many roof vents you need. Once the recommended amount of net free area is known and the type of vents have been selected you can determine how many vents you will need. In our 2000 square feet example we determined we needed 480 square inches for intake 480 square inches for exhaust. Attic ventilation requirements how many attic vents your roof needs.

Squaring the radius is 9 and multiplying it by pi is 28 26. Foot of ventilation for every 150 sq. Choose one of the following products to meet the recommended exhaust nfva of 528 square inches. A 6 inch diameter soffit vent would have a 3 inch radius.

There are a number of different types of vents to choose from so getting the ones to suit you should not be difficult although you will still need to work out how many to purchase. 27 lineal feet required. For example if you have 1200 square feet of attic space you should need at least 4 air vents to ensure proper ventilation. Ventsure 4 foot strip heat moisture ridge vent.

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. Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier. Keep in mind you should always consult with a professional roofing company when determining how many air vents. Feet of attic space divided 50 50.

Soffit vents are vital in keeping air flowing throughout your attic space.