How Many Vents Should A Roof Have

Solid vinyl soffit material costs the same as the vented material.

How many vents should a roof have.

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. 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. For example if you have 1200 square feet of attic space you should need at least 4 air vents to ensure proper ventilation. 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. 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. 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.

Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic. These vents and ducts should never share space with the roof vent and air should never be vented directly into the attic. Attic ventilation requirements how many attic vents your roof needs. Hot air exhaust vents located at the peak of the roof allow hot air to escape.

You ll need the square footage of your attic to calculate the number of roof vents that you should need. Foot of ventilation for every 150 sq. A roof vent is a type of fixture installed on your roof that exhausts hot air. Choose one of the following products to meet the recommended exhaust nfva of 528 square inches.

Keep in mind you should always consult with a professional roofing company when determining how many air vents. The next step is to divide the nfa required by the nfa rating of the vent. Feet of attic space divided 50 50. Luckily there is a basic formula you can use to determine this.

Ventsure 4 foot strip heat moisture ridge vent. In our 2000 square feet example we determined we needed 480 square inches for intake 480 square inches for exhaust. Even if you have vents in your roof you still need to have soffit vents to allow the air to circulate naturally. A 6 inch diameter soffit vent would have a 3 inch radius.

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