Safety requirements for scaffolding in Standards - 29 CFR 24
To be continued:
TABLE D-18 - MINIMUM DIMENSIONS FOR BRICKLAYERS'
SQUARE SCAFFOLD MEMBERS
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|
Members | Dimensions
| (Inches)
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|
Bearers or horizontal members........| 2 by 6
Legs.................................| 2 by 6
Braces at corners....................| 1 by 6
Braces diagonally from center frame..| 1 by 8
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1910.28(l)(5)
Platform Planks shall be at least 2- by 9-inch nominal size. The ends of the planks shall overlap the bearers of the squares and each plank shall be supported by not less than three squares.
1910.28(l)(6)
Bricklayers' square scaffolds shall not exceed three tiers in height and shall be so constructed and arranged that one square shall rest directly above the other. The upper tiers shall stand on a continuous row of planks laid across the next lower tier and be nailed down or otherwise secured to prevent displacement.
1910.28(l)(7)
Scaffolds shall be level and set upon a firm foundation.
1910.28(m)
"Horse scaffolds."
1910.28(m)(1)
Horse scaffolds shall not be constructed or arranged more than two tiers or 10 feet in height.
1910.28(m)(2)
The members of the horses shall be not less than those specified in Table D-19.
1910.28(m)(3)
Horses shall be spaced not more than 5 feet for medium duty and not more than 8 feet for light duty.
1910.28(m)(4)
When arranged in tiers, each horse shall be placed directly over the horse in the tier below.
1910.28(m)(5)
On all scaffolds arranged in tiers the legs shall be nailed down to the planks to prevent displacement or thrust and each tier shall be substantially cross braced.
TABLE D-19 - MINIMUM DIMENSIONS FOR HORSE SCAFFOLD MEMBERS
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|
| Dimensions
Members | (Inches)
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|
Horizontal members or bearers ........| 3 by 4
Legs .................................| 1 1/4 by 4 1/2
Longitudinal brace between legs ......| 1 by 6
Gusset brace at top of legs ..........| 1 by 8
Half diagonal braces .............. ..| 1 1/4 by 4 1/2
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