Safety requirements for scaffolding in Standards - 29 CFR 9
TABLE D-10 - MINIMUM NOMINAL SIZE AND MAXIMUM SPACING OF MEMBERS OF
INDEPENDENT POLE SCAFFOLDS - LIGHT DUTY
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|
| Maximum height of scaffold
|__________________________________
| |
| 20 feet | 60 feet
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| |
Uniformly distributed load.......| Not to exceed 25 |
| pounds per |
| square foot. |
Poles or uprights................| 2 by 4 in........| 4 by 4 in.
Pole spacing (longitudinal)......| 6 ft. 0 in...... | 10 ft. 0 in.
Pole spacing (transverse)........| 6 ft. 0 in.......| 10 ft. 0 in.
Ledgers..........................| 1 1/4 by 4 in....| 1 1/4 by 9 in.
Bearers to 3 ft. 0 in. span......| 2 by 4 in........| 2 by 4 in.
Bearers to 10 ft. 0 in. span.....| 2 by 6 in. | 2 by 9 in.
| or 3 by 4 in...| (rough) or
| | 3 by 8 in.
Planking.........................| 1 1/4 by 9 in....| 2 by 9 in.
Vertical spacing of horizontal | |
members........................| 7 ft. 0 in.......| 7 ft. 0 in.
Bracing, horizontal and diagonal.| 1 by 4 in........| 1 by 4 in.
Tie-ins..........................| 1 by 4 in........| 1 by 4 in.
Toeboards........................| 4 in. high.......| 4 in. high
| | (minimum)
Guardrail........................| 2 by 4 in........| 2 by 4 in.
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All members except planking are used on edge.