2022 Manitoba Workplace Safety and Health Act and Regulation

26.16(3) Subsection (2) applies to frozen ground, but does not apply to a
trench that is cut in solid rock or other equally stable material.
26.16(4) An employer who requires or permits a worker to enter a trench
that has a depth of more than 4.5 m must ensure that the walls of
the trench are stabilized using a method designed and certified by a
professional engineer.
M.R. 147/2010; 128/2019
Supporting adjacent structures
26.16.1 If a building, foundation or other structure adjacent to an excavation
may be affected by it, an employer must ensure that, before any
work on the excavation begins, the building, foundation or other
structure is supported by a support structure that is
(a) designed and certified by a professional engineer; and
(b) constructed, installed, used and dismantled in accordance with
the professional engineer’s specifications.
M.R. 147/2010
Support structure requirements 
26.17(1) An employer must ensure that a support structure is
(a) structurally sound;
(b) suitable for the type and condition of the soil to be supported;
and
(c) of sufficient strength to prevent the walls of the excavation
from caving in, collapsing or otherwise moving into the
excavation.
26.17(2) Subject to subsection (3), an employer must ensure that any support
structure extends at least 300 mm above the top of the excavation.
26.17(3) When under section 26.15,

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Workplace Safety And Health Regulation
239
(a) a combination slope and vertical face is used for wall stability in
an excavation; and
(b) the depth of the excavation below the sloped sides exceeds one
metre;
an employer must ensure that a support structure is installed
and extends at least 600 mm above the bottom of the sloped
sides in a continuous manner to prevent any material from
falling into the excavation.
M.R. 147/2010