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Occupational Health and Safety Code

The Occupational Health and Safety Code provides specific technical health and safety rules and requirements for Alberta workplaces.

Alberta Regulation 191/2021

Schedule 9 Shoring Component Dimensions

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Contents

Shoring components used in excavations, trenches, tunnels and underground shafts

Shoring components used in excavations, trenches, tunnels and underground shafts

[ See subsections 457(1), 457(2) ]

		Uprights		Stringers		Cross‑braces
Soil type	Depth of excavation (metres)	Minimum dimensions (millimetres)	Maximum horizontal spacing (millimetres)	Minimum dimensions (millimetres)	Maximum vertical spacing (millimetres)	Minimum dimensions (millimetres)		Maximum spacing (millimetres)
						Width of trench		Vertical	Horizontal
						Less than 1.8 metres	1.8 to 3.7 metres	Vertical	Horizontal
Hard and compact	1.5 to 3.0	38 x 235	1800	89 x 140	1200	89 x 89	140 x 140	1200	1800
	More than 3.0 to 4.5	38 x 235	1200	89 x 140	1200	89 x 140	140 x 140	1200	1800
	More than 4.5 to 6.0	38 x 235	10	140 x 140	1200	140 x 184	140 x 184	1200	1800
Likely to crack or crumble	1.5 to 3.0	38 x 235	1200	89 x 140	1200	89 x 140	140 x 140	1200	1800
	More than 3.0 to 4.5	38 x 235	900	140 x 140	1200	140 x 140	140 x 184	1200	1800
	More than 4.5 to 6.0	38 x 235	10	140 x 184	1200	140 x 184	140 x 184	1200	1800
Soft, sandy or loose	1.5 to 3.0	38 x 235	10	140 x 140	1200	140 x 140	140 x 184	1200	1800
	More than 3.0 to 4.5	38 x 235	10	140 x 184	1200	140 x 184	184 x 184	1200	1800
	More than 4.5 to 6.0	38 x 235	10	184 x 184	1200	140 x 184	184 x 235	1200	1800

This material is sourced from the Alberta King’s Printer consolidation of the Occupational Health and Safety Act, Occupational Health and Safety Regulation and Occupational Health and Safety Code and, while thought to be accurate, is provided without warranty of any kind. The material provided is solely for the user’s information and convenience. All persons making use of consolidated legislation are reminded that it has no legislative sanction, that amendments have been embodied for convenience of reference only. The official Statutes and Regulations should be consulted for all purposes of interpreting and applying the law. The Crown, its agents, employees or contractors will not be liable to you for any damages, direct or indirect, arising out of your use of this material. If in doubt with respect to any information contained within this material, or for confirmation of legal requirements, please refer to the official Statutes and Regulations of Alberta. If there is any inconsistency or conflict between any of this material and the legislation, the legislation shall prevail. This material is current to March 2023. This material may be used, reproduced, stored or transmitted for non-commercial purposes. The source of this material must be acknowledged when publishing or issuing it to others. This material is not to be used, reproduced, stored or transmitted for commercial purposes without written permission from the Government of Alberta.

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