COLUMN LOADS

COLUMN LOADS
The Table below provides information for building temporary scaffolds and other uses where compression members are needed.

Note the dramatic increase in load capacity with the “T” shape ( a double 2x4 in “T” shape has about 50% greater capacity than double 2x4’s flat, and nearly the same capacity as double 2x6’s nailed flat). This is primarily because the “T” addition increases the rigidity of the column by lowering the “L/d” slenderness ratio.

Also note the decrease in load capacity where the unsupported length is increased. The unsupported length can be reduced somewhat when “X” bracing temporary columns, by placing braces for the narrow dimension a foot or two below or above the top or bottom respectively of the column.

Note that single 2x4’s should not be used as columns much longer than 6 feet to prop up any appreciable load.

Allowable Column Loads in Pounds (Structural Lumber Only)

Column Type ..dbl2x4....dbl2x4"T"....2x6......dbl2x6"sq".....2x6&2x4
Column Shape..Square.......Tee............................Square................Tee

Unsupported
length, ft.
...6......................6620*.......9010*.......1300........1040*........16880*
...7......................4860.........6620*.......................7640*.......16880*
...8......................3720.........5070*.........................5850.......13290*
..10.....................2380.........3240...........................3740.........8510*
..12.....................1650..........2250..........................2600.........5910*
..14........................................1650.........................1910..........4340
..16...........................................................................................3320
* These loads will crush wood if bearing perp. to grain and require metal shoe or concrete bearing for column support.