In the past, two stairs were almost always enough. Today, with buildings growing taller and denser, the OBC is increasingly demanding a or enhanced evacuation strategies (like elevators used for evacuation) for taller buildings.
The most interesting shift in recent OBC interpretations (and Supplementary Standard SB-10) revolves around high-rise egress widths. ontario building code
#OntarioBuildingCode #Architecture #Construction #FireSafety #UrbanPlanning #Engineering In the past, two stairs were almost always enough
For decades, Ontario followed a standard North American model: if you have a high-rise, you generally need two exits. To save space, architects often utilized "scissor stairs"—two stairwells sitting side-by-side within the same shaft, separated by a thin fire-rated wall. In the past