The Ontario Building Code | Firewalls
(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
4.1.6. Loads Due to Snow and Rain