Residential Attic Ventilation Requirements

Attic venting serves an important purpose and is key to a well performing roof system.

Residential attic ventilation requirements.

On the upcodes website. It comes on an easy to install flexible mesh. As an example of what you can find in chapter 8 of the 2018 irc see. The roofing industry also has practical guide lines for attic ventilation.

Code requirements the international building code. See the benefits of attic ventilation a new roof is more than just shingles. Of vent for every 300 sq. Mesh roll ridge vent in black nail gun version when installed as part of a properly balanced when installed as part of a properly balanced attic ventilation system gaf cobra exhaust vent is a shingle over exhaust vent installed at the roof ridge that helps exhaust excess heat and moisture from your attic.

2018 international residential code. In order to facilitate this exchange of warm and cool air the general rule of thumb suggests installing at least 1 sq. Typically building codes include minimum requirements applicable to attic ventilation. Building codes vary.

Contains sections covering roof framing roof sheathing and roof ventilation. Prior to installing the ridge vent a 1 inch wide strip of roof decking is cut out along both sides of the ridgeline to allow for air movement through the. Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems. The following is a list of options for installing ventilation into a residential attic space.

Roof insulation thermal resistance at roof perimeter should be equal or greater to thermal resistance of exterior wall. 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. Anyone involved with residential roofing should become familiar with the purpose of attic ventilation and understand how to achieve an effective ventilation system while meeting building code requirements. 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.

1 300 ventilation ratio recommended. 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. 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. The recommended ventilation ratio to provide for vented attic assemblies when an air barrier is present is the 1 300 ratio as specified by most building codes.

A ridge vent is a ventilation strip that is placed along the ridgeline of the home.