2022 Manitoba Workplace Safety and Health Act and Regulation

Openings in temporary floors
30.5
When an opening in a temporary floor cannot be adequately
protected by a guardrail, an employer must ensure that
(a) the opening is completely covered with securely fastened planks
or other materials capable of supporting any load that will be or
is likely to be imposed on them; and
(b) the covering is clearly, visibly and legibly marked to identify the
hazard.
Temporary stairs and landings
30.6(1) An employer must ensure that
(a) temporary stairs and landings are designed and constructed to
support any load that will be or is likely to be imposed on them;
and
(b) temporary stairs have
(i) in any one flight, a rise that is uniform and treads that are
similar in width, length and height,
(ii) a slope not exceeding 50° from the horizontal,
(iii) a vertical distance of not more than 4 m between landings
or floors,
(iv) on open sides, including landings, securely fastened and
supported handrails equivalent in strength to the top rail of
a guardrail, and
(v) a minimum width of at least 750 mm, except where the
temporary stairs are prefabricated steel scaffold stairs or
unless space restrictions require the stairs to be narrower.

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Workplace Safety And Health Regulation
280
30.6(2) An employer must ensure that steel stairs that are designed to have
concrete fill have secured in place temporary wooden tread fillers
which extend the full width and length of the treads and landings.
Design of temporary runways, ramps and platforms
30.7 
An employer must ensure that a temporary runway, ramp or platform
(a) is designed and constructed to support any load that will be or
is likely to be imposed on it;
(b) subject to working conditions and usage, is a minimum of 600
mm in width; and
(c) is securely fastened in place and adequately supported to
prevent horizontal or lateral movement.