Roof Attic Ventilation Requirement

The amount of space you devote to intake must be equal to the amount you allow for exhaust and these must be calculated according to the size of your attic and slope of your roof.

Roof attic ventilation requirement.

Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator. The majority of the requirements related to attic ventilation have not changed much from the previous editions. Most building codes require a ratio of 1 150 ventilation space to attic floor space. The following are the requirements taken directly from the irc.

The key to proper ventilation of your roof and attic is balance. The ventilation amount and opening size requirements can be found in section 806 roof ventilation of chapter 8 roof ceiling construction. You can calculate attic ventilation requirements by determining the square footage of your attic. Feet of attic space divided 50 50.

You can also contact your local municipality to check on building code in your area. Explore owens corning ventilation products. Foot of ventilation for every 150 sq. Attic ventilation requirements how many attic vents your roof needs 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.