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Unit 5

This document provides information on scaffold load capacities and allowable scaffold spans. It states that light-duty scaffolds can support 25 pounds per square foot, medium-duty can support 50 pounds, and heavy-duty can support 75 pounds. It also provides details on maximum permissible scaffold spans and planking levels based on the intended load. Safety net requirements are specified based on the vertical distance from the working level.

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Raj
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97 views2 pages

Unit 5

This document provides information on scaffold load capacities and allowable scaffold spans. It states that light-duty scaffolds can support 25 pounds per square foot, medium-duty can support 50 pounds, and heavy-duty can support 75 pounds. It also provides details on maximum permissible scaffold spans and planking levels based on the intended load. Safety net requirements are specified based on the vertical distance from the working level.

Uploaded by

Raj
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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01 ConPal Dewalt 7/8/05 3:50 PM Page 85

SCAFFOLD LOADS
Rated load capacity Intended load
Light-duty 25 pounds per square foot applied
uniformly over the entire span area.
Medium-duty 50 pounds per square foot applied
uniformly over the entire span area.
Heavy-duty 75 pounds per square foot applied
uniformly over the entire span area.
One-person 250 pounds placed at the center of the
span (total 250 pounds).
Two-person 250 pounds placed 18 inches to the left
and right of the center of the span
(total 500 pounds).
Three-person 250 pounds placed at the center of the
span and 250 pounds placed 18 inches
to the left and right of the center of the
span (total 750 pounds).
Note: Platform units used to make scaffold platforms intended for light-duty use
shall be capable of supporting at least 25 pounds per square foot applied uniformly
over the entire unit-span area, or a 250-pound point load placed on the unit at the
center of the span, whichever load produces the greater shear force.

ALLOWABLE SCAFFOLD SPANS


2 x 10 inch (nominal) or 2 x 9 inch (rough)
solid sawn wood planks
Maximum Maximum Maximum
intended permissible permissible span
nominal load span using using nominal
(lb/ft2) full thickness thickness
undressed lumber (ft)
lumber (ft)

25 10 8
50 8 6
75 6 —
01 ConPal Dewalt 7/8/05 3:50 PM Page 86

MAXIMUM NUMBER OF PLANKED LEVELS


Maximum number of
additional planked levels Maximum
Number of height of
Working Light Medium Heavy scaffold
Levels duty duty duty (in feet)

1 16 11 6 125

2 11 1 0 125

3 6 0 0 125

4 1 0 0 125

SAFETY NETS
Outward from the outermost projection of the work surface
Minimum required horizontal
Vertical distance from distance of outer edge of net
working level to horizontal from the edge of the working
plane of net surface

Up to 5 feet 8 feet

More than 5 feet, up to 10 feet 10 feet

More than 10 feet 13 feet

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