CPA · Houses with a Secondary Suite
9.9.4.2 Fire Separations for Exits
protected by a continuous smoke-tight barrier of not less than 12.7 mm thick gypsum board installed on
a) both sides of walls separating the exit from the remainder of the building, and
b) the underside of floor-ceiling framing separating the exit from the remainder of the building.
(See Sentence 9.10.9.3.(2) for closures.)