Safety requirements for scaffolding in Standards - 29 CFR 8
TABLE D-8 - MINIMUM NOMINAL SIZE AND MAXIMUM SPACING OF MEMBERS
OF SINGLE POLE SCAFFOLDS - MEDIUM DUTY
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|
Uniformly distributed load................| Not to exceed 50 pounds
| per square foot.
Maximum height of scaffold................| 60 ft.
Poles or uprights.........................| 4 by 4 in.
Pole spacing (longitudinal)...............| 8 ft. 0 in.
Maximum width of scaffold.................| 5 ft. 0 in.
Bearers or putlogs........................| 2 by 9 in. or 3 by 4 in.
Spacing of bearers or putlogs.............| 8 ft. 0 in.
Ledgers...................................| 2 by 9 in.
Vertical spacing of horizontal members. | 9 ft. 0 in.
Bracing, horizontal.......................| 1 by 6 in. or
| 1 1/4 by 4 in.
Bracing, diagonal.........................| 1 by 4 in.
Tie-ins............................................ | 1 by 4 in.
Planking......................................... | 2 by 9 in.
Toeboards.................................| 4 in. high (minimum).
Guardrail.................................| 2 by 4 in.
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All members except planking are used on edge.
TABLE D-9 - MINIMUM NOMINAL SIZE AND MAXIMUM SPACING OF
MEMBERS OF SINGLE POLE SCAFFOLDS - HEAVY DUTY
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|
Uniformly distributed load................| Not to exceed 75 pounds
| per square foot.
Maximum height of scaffold................| 60 ft.
Poles or uprights.........................| 4 by 4 in.
Pole spacing (longitudinal)...............| 6 ft. 0 in.
Maximum width of scaffold.................| 5 ft. 0 in.
Bearers or putlogs........................| 2 by 9 in. or
| 3 by 5 in.(rough)
Spacing of bearers or putlogs.............| 6 ft. 0 in.
Ledgers...................................| 2 by 9 in.
Vertical spacing of horizontal members. | 6 ft. 6 in.
Bracing, horizontal and diagonal..........| 2 by 4 in.
Tie-ins...................................| 1 by 4 in.
Planking..................................| 2 by 9 in.
Toeboards.................................| 4 in. high (minimum).
Guardrail.................................| 2 by 4 in.
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All members except planking are used on edge.