what is the requirement for the base of scaffolding?
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Published by SALUSFor supported scaffolds, the poles, legs, posts, frames, and uprights must bear on base plates and mud sills or another adequate firm foundation 5, 11. The footings should be level, sound, rigid, and able to support the loaded scaffold without settling or displacement 5, 11. Unstable objects should not be used to support scaffolds or platform units 5, 11.
Additionally, a scaffold built from the ground or another surface should be supported by a foundation of sufficient area, stability, and strength to ensure the scaffold's stability [1]. It should be set level on a stable sill that is at least 38 x 240 millimeters and continuous under at least 2 consecutive supports [1], and have a base plate installed in any upright that could penetrate the sill [1].
Sources used for this answer
[1] Occupational Health and Safety Regulations, 2020 (Sask. Reg. 10/2020)
Page 99
Open source documentSource excerpt
- (b) designed, constructed and erected to support or resist: - (i) in the case of a wooden scaffold, at least 4 times the load that may be imposed on the scaffold; - (ii) in the case of a metal scaffold, at least 2.2 times the load that may be imposed on the scaffold; - (iii) in the case of any components suspending any part of a scaffold supporting workers, at least 10 times the load that may be imposed on those components; and - (iv) 4 times the maximum load or force to which the scaffold is likely to be subjected without overturning; and - (c) erected, maintained and dismantled by a competent worker. - (3) An employer or contractor shall ensure that a freestanding scaffold is restrained from overturning by guying or other suitable means. - (4) An employer or contractor shall ensure that a scaffold that is built from the ground or other surface: - (a) is supported by a foundation that is of sufficient area, stability and strength to ensure the stability of the scaffold; - (b) is set level on a stable sill that is at least 38 x 240 millimetres and continuous under at least 2 consecutive supports; - (c) has a base plate installed in any upright that could penetrate the sill; - (d) is supported against lateral movement by adequate, secure bracing; - (e) is anchored: - (i) vertically at not less than 4-metre intervals and horizontally at not less than 6-metre intervals; - (ii) if designed by a professional engineer, at intervals recommended by a professional engineer; or - (iii) if commercially manufactured, at intervals recommended by the manufacturer; - (f) is provided with internal stairways or ladders if the scaffold is 9 metres or more in height; and - (g) is checked to ensure that the scaffold is plumb and level after each tier is added. - (5) If a scaffold is partially or fully enclosed, an employer or contractor shall ensure that all scaffold components and tie-ins are adequate to support the added load that may be placed on the scaffold as a …
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