117(1)Where work on a building or structure progresses to one storey or 4.5 m above the lowest floor level, whichever is the lower, an employer shall ensure that permanent stairs or temporary stairs are installed in the building or structure leading from the lowest floor level to all the floors above.

117(2)An employer may use guardrails for temporary stairs and landings in place of the handrails and supporting structures required under subsections 115(4) and (5).