Attic Ventilation Requirements Canada

Careful attention to the need for adequate ventilation is necessary when water and vapour impermeable roof covers are applied over attic and roof spaces.

Attic ventilation requirements canada.

Heat build up the canadian asphalt shingle manufacturers association has issued a bulletin titled proper ventilation for asphalt shingle covered roofs. 2 where the roof slope is less than 1 in 6 or in roofs that are constructed with roof joists the unobstructed vent area shall be not less than 1 150 of the insulated ceiling area. 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 serves a number of purposes.

For the 1 150 attic ventilation requirement simply double the amount of exhaust and intake calculated. It comes on an easy to install flexible mesh roll and is hand nailable with no complicated fitting wrapping nail gun adapters. 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. It reduces summer heat buildup prolonging the life of roofing and reduces air conditioner loads.

It is important that air movement occurs and is not impeded by any framing members of the. Vent requirements 1 except as provided in sentence 2 the unobstructed vent area shall be not less than 1 300 of the insulated ceiling area. Ridge static attic vents 384 00 minimum sq. The majority of the requirements related to attic ventilation have not changed much from the previous editions.

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. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. 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. The ventilation amount and opening size requirements can be found in section 806 roof ventilation of chapter 8 roof ceiling construction.

The following are the requirements taken directly from the irc. Of net free area of intake needed at or near the soffit. 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. A ridge vent is a ventilation strip that is placed along the ridgeline of the home.

The ontario building code vent requirements 9 19 1 2.