3.3.1.18. Guards
1) Except as provided in Sentence (4) and Article 3.3.2.9., a guard not less than 1070mm high shall be provided
a) around any roof to which access is provided for purposes other than maintenance,
b) at openings into smoke shafts referred to in Subsection 3.2.6. that are less than 1070mm above the floor, and
c) at each raised floor, mezzanine, balcony, gallery, interior or exterior vehicular ramp, and at other locations where the difference in level is more than 600mm.
2) Except as permitted by Sentence 3.3.2.9.(4) and unless it can be shown that the size of openings that exceed this limit does not present a hazard, there shall be no opening that permits the passage of a sphere whose diameter is more than 100mm through a guard serving
a) an exterior balcony, or
b) a room, stairway, or space not within a suite of residential occupancy
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