Residential Attic Ventilation

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.

Residential attic ventilation. 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. 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 general rule of thumb suggests installing at least 1 sq. The following is a list of options for installing ventilation into a residential attic space.

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. This is based principally on good historical experience and simple psychrometric analysis handegord giroux 1984. Attic venting serves an important purpose and is key to a well performing roof system. Code requirements the international building code.

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. Building codes vary though so do check with your. It comes on an easy to install flexible mesh. 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.

Calculate or enter the square footage of the attic or area to be vented. This ply gem 14 in. See the benefits of attic ventilation a new roof is more than just shingles. A ridge vent is a ventilation strip that is placed along the ridgeline of the home.

Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems. Typically building codes include minimum requirements applicable to attic ventilation. The roofing industry also has practical guide lines for attic ventilation. Of vent for every 300 sq.

How attic ventilation works. Its two piece design is fully compatible with all siding profiles ply gem gable vents are designed to withstand the toughest weather and retain their beauty year after year. 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.