4.1.5.17.Firewalls (See Note A-4.1.5.17.)

(1) Firewalls shall be designed to resist the maximum effect due to,
  (a) the appropriate lateral design loads prescribed elsewhere in this Section, or
  (b) a factored lateral load of 0.5 kPa under fire conditions, as described in Sentence (2).

  (2) Under fire conditions, where the fire-resistance rating of the structure is less than that of the firewall,
  (a) lateral support shall be assumed to be provided by the structure on one side only, or
  (b) another structural support system capable of resisting the loads imposed by a fire on either side of the firewall shall
      be provided.

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.