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

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13. For all insulated ceilings and for exterior walls where the outside or intermediary sheathing has a water vapor permeance coefficient lower than 250 ng/(Pa•s•m2), the following requirements must also be met:
(1)  insulation must be protected by a Type 1 vapor barrier and installed so that all joints occur at framing members, furring or blocking, and lapped at least 100 mm at all joints; and
(2)  holes through vapour barriers installed in ceilings for the installation of electrical wiring, electrical boxes, piping or duct work must be effectively sealed with tape or any other sealing material.
O.C. 89-83, s. 13; O.C. 1721-85, s. 3.