Minimum Attic Ventilation Requirements

The roofing industry also has practical guide lines for attic ventilation.

Minimum attic ventilation requirements.

Of net free area of intake needed at or near the soffit. 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. Based on your 1100 sq. The ventilation amount and opening size requirements can be found in section 806 roof ventilation of chapter 8 roof ceiling construction.

According to their requirements you should have 1 square foot of attic ventilation per 300 sq ft of attic floor space. Intake vents located at the lowest part of the roof under the eaves. 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. Of net free area of exhaust needed at or near the ridge.

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Typically building codes include minimum requirements applicable to attic ventilation. Attic ventilation is an important part of keeping your building healthy. Current regulations state that the minimum attic ventilation requirements are 150 1.

The following are the requirements taken directly from the irc. Exhaust nfva near ridge of the roof. Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems. 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.

As an example in an attic that is 30 feet by 20 feet you would have 600 square feet of floor area. Figure 1 soffit to ridge attic ventilation. For the 1 150 attic ventilation requirement simply double the amount of exhaust and intake calculated. And this guideline you ll need a minimum of.

The majority of the requirements related to attic ventilation have not changed much from the previous editions. According to the fha federal housing administration us for every 300 square feet of attic floor area you should have at minimum one square foot ventilation. Ridge static attic vents 384 00 minimum sq. The federal housing authority fha and the urban development hud have established minimum requirements for attic ventilation.

Code requirements the international building code.