E-1.1, r. 1 - Regulation respecting energy conservation in new buildings

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14. Attics or roof spaces above in insulated ceiling must be ventilated with openings to the exterior to provide an unobstructed vent area of not less than 1/300 of the insulated ceiling area.
Vents may be roof type, eaves type, gable-end type or any combination thereof, and must be distributed on opposite sides of the building and on the upper and lower parts of the roof, where applicable.
the unobstructed vent area must be determined in accordance with CSA A93-M1982, Vents for Buildings.
O.C. 89-83, s. 14; O.C. 1721-85, s. 3.