Safety requirements for scaffolding in Standards - 29 CFR 10
To be continued:
TABLE D-11 - MINIMUM NOMINAL SIZE AND MAXIMUM SPACING OF MEMBERS
OF INDEPENDENT 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.
Pole spacing (transverse).................| 8 ft. 0 in.
Ledgers...................................| 2 by 9 in.
Vertical spacing of horizontal members....| 6 ft. 0 in.
Spacing of bearers........................| 8 ft. 0 in.
Bearers...................................| 2 by 9 in. (rough) or
| 2 by 10 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.