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.
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.
The following are the requirements taken directly from the irc.
This cap features both a back draft damper and bird screen preventing outside air from entering the home and birds and small pests from entering duct work.
The roofing industry also has practical guide lines for attic ventilation.
The ventilation amount and opening size requirements can be found in section 806 roof ventilation of chapter 8 roof ceiling construction.
After air sealing attic ventilation is your second line of defence against the water vapour that may have found its way into the attic.
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 majority of the requirements related to attic ventilation have not changed much from the previous editions.
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.
For the 1 150 attic ventilation requirement simply double the amount of exhaust and intake calculated.
Typically building codes include minimum requirements applicable to attic ventilation.
Of net free area of intake needed at or near the soffit.
A ridge vent is a ventilation strip that is placed along the ridgeline of the home.
Of net free area of exhaust needed at or near the ridge.
Heat build up the canadian asphalt shingle manufacturers association has issued a bulletin titled proper ventilation for asphalt shingle covered roofs.
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 is compatible with 3 or 4 ductwork and includes a 3 to 4 adapter for convenience.
It reduces summer heat buildup prolonging the life of roofing and reduces air conditioner loads.
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.
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.
Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems.
It is important that air movement occurs and is not impeded by any framing members of the.
Attic ventilation serves a number of purposes.
