Roof Ventilation Requirements Canada

Most building codes require a ratio of 1 150 ventilation space to attic floor space.

Roof ventilation requirements canada. 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. Enter square footage calculate or enter the square footage of the attic or area to be vented. 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. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.

You can calculate attic ventilation requirements by determining the square footage of your attic. 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. Four out of 5 homes in the u s. Residential and commercial roofing shingles slate roof ventilation roof underlayments asphaltic and tpo roof membranes.

This makes it possible for wind coming from any direction to ventilate the roof space provided that roof vents are installed on all exposed sides. This video how does proper attic ventilation protect my roof illustrates how a proper attic ventilation system can protect a roof against. 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. And canada have asphalt shingle roofs so it s important that homeowners are able to recognize signs there may be issues with their roofing system.

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. But how many can. 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. You can also contact your local municipality to check on building code in your area.

Roofing shingles and materials plus factory certified roofers including ratings from real homeowners from north america s largest roofing manufacturer. It is compatible with 3 or 4 ductwork and includes a 3 to 4 adapter for convenience. The key to proper ventilation of your roof and attic is balance. 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 amount of space you devote to intake must be equal to the amount you allow for exhaust and these must be calculated according to the size of your attic and slope of your roof.