Roof Attic Ventilation Requirement

The key to proper ventilation of your roof and attic is balance.

Roof attic ventilation requirement.

Most building codes require a ratio of 1 150 ventilation space to attic floor space. 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. The following are the requirements taken directly from the irc.

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. Feet of attic space divided 50 50. Explore owens corning ventilation products. 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.

You can calculate attic ventilation requirements by determining the square footage of your attic. 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. The majority of the requirements related to attic ventilation have not changed much from the previous editions. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.