Roof Attic Ventilation Requirement

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.

Roof attic ventilation requirement. The ventilation amount and opening size requirements can be found in section 806 roof ventilation of chapter 8 roof ceiling construction. The following are the requirements taken directly from the irc. 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. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.

Feet of attic space divided 50 50. Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space. Foot of ventilation for every 150 sq. The majority of the requirements related to attic ventilation have not changed much from the previous editions.

Explore owens corning ventilation products. Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge. You can also contact your local municipality to check on building code in your area. You can calculate attic ventilation requirements by determining the square footage of your attic.