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

Section 16 Disposition versions

2012-09-01

16. Notwithstanding section 14, where the roof slope is less than 1 in 6, or where the interior finish is applied directly to the underside of the roof framing members, an attic or roof space above an insulated ceiling must have open-air vent openings with an unobstructed vent area no less than 1/150 of the surface of the insulated ceiling area.

Vents may be roof type, gable-end type or any combination thereof, and must be distributed on opposite sides of the building or, where applicable, on the upper and lower parts of the roof.

Where the roof slope is less than 1 in 6, or where the roof slope is at least 1 in 6 but the interior finish is applied directly to the underside of the roof framing members, cross purlins at least 38 mm deep must be placed over and across the roof framing members and a clearance of at least 25 mm must be left between the underside of these cross purlins and the top of the insulating material.

Where the roof slope is at least 1 in 6, and where roof frame members run across the roof slope and when the interior finish is applied directly to the underside of the roof framing members, the cross purlins may be omitted if a clearance of at least 75 mm is left between the underside of the roof sheathing framing and the upper side of the insulation if the clearance continues along the total length of roof framing members and if open-air vent openings are installed at both extremities of each clearance.

O.C. 89-83, s. 16; O.C. 1721-85, s. 3.