Roof Attic Ventilation Requirement

Intake vents located at the lowest part of the roof under the eaves allow cool.

Roof attic ventilation requirement.

The key to proper ventilation of your roof and attic is balance. 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. 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. Typically building codes include minimum requirements applicable to attic ventilation.

The roofing industry also has practical guide lines for attic ventilation. 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. You can also contact your local municipality to check on building code in your area.

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. You can calculate attic ventilation requirements by determining the square footage of your attic. See the benefits of attic ventilation a new roof is more than just shingles. Throughout the balance of this digest the terms attic and roof will and can be used interchangeably.

Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. 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. Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof. 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. Explore owens corning ventilation products. Feet of attic space divided 50 50. Code requirements the international building code.

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. Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems.