The Ontario Building Code | Termination of Floors or Mezzanines

9.10.12.1. Termination of floors or Mezzanines

(1) Except as provided in Sentence (2) and in Articles 9.10.1.3. and 9.10.9.5., the portions of a floor area or mezzaninethat do not terminate at an exterior wall, a firewallor a vertical shaft, shall terminate at a vertical fire separation having a fire-resistance ratingnot less than that required for the floor assembly that terminates at the separation.

(2) Amezzanine need not terminate at a vertical fire separation where the mezzanineis not required to be considered as a storey in Articles 9.10.4.1. and 9.10.4.2.