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All load-carrying timber members of scaffolding framing shall be a minimum of 1500 f. (Stress Grade) construction grade lumber. All dimensions are nominal sizes as provided in the American Lumber Standards, except that where rough sizes are noted, only rough and undressed lumber or the size specified will satisfy minimum requirements. (Note: Where nominal sizes of lumber are used in place of rough sizes, the nominal size lumber shall be such as to provide equivalent strength to that specified in Tables D-7 through D-12 and D-16).

All planking shall be Scaffold Grade as recognized by grading rules for the species of wood used.

The maximum permissible spans for 2x9 inch or wider planks are shown in the following table. The maximum permissible span for 1 1/4 x 9-inch or wider plank of full thickness is 4 feet with medium loading of 50 p.s.f