Attic Ventilation Requirements Canada

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.

Attic ventilation requirements canada.

Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems. After air sealing attic ventilation is your second line of defence against the water vapour that may have found its way into the attic. Of net free area of exhaust needed at or near the ridge. A ridge vent is a ventilation strip that is placed along the ridgeline of the home.

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. For the 1 150 attic ventilation requirement simply double the amount of exhaust and intake calculated. Ridge static attic vents 384 00 minimum sq. Attic ventilation serves a number of purposes.

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 vent. 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 rvk1a steel roof cap kit is an the rvk1a steel roof cap kit is an easy to install vent for ventilation fans bath rec room home gym etc. It is compatible with 3 or 4 ductwork and includes a 3 to 4 adapter for convenience.

The following are the requirements taken directly from the irc. 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. Of net free area of intake needed at or near the soffit.

The roofing industry also has practical guide lines for attic ventilation. See the benefits of attic ventilation a new roof is more than just shingles. Typically building codes include minimum requirements applicable to attic ventilation. Code requirements the international building code.

The ventilation amount and opening size requirements can be found in section 806 roof ventilation of chapter 8 roof ceiling construction. Heat build up the canadian asphalt shingle manufacturers association has issued a bulletin titled proper ventilation for asphalt shingle covered roofs. It reduces summer heat buildup prolonging the life of roofing and reduces air conditioner loads.