Softwood Lumber Standard

Nominal and minimum-dressed sizes of lumber

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Softwood lumber standard applied to boards, dimensional lumber and timber:

Item	Thickness			Face Widths
	Nominal	Minimum Dressed		Nominal	Minimum Dressed
	Nominal	Dry (max 19% moisture content) (inches)	Green (inches)	Nominal	Dry (max 19% moisture content) (inches)	Green (inches)
Boards				2	1 1/2	1 9/16
				3	2 1/2	2 9/16
				4	3 1/2	3 9/16
	3/8	5/16	11/32	5	4 1/2	4 5/8
	1/2	7/16	15/32	6	5 1/2	5 5/8
	5/8	9/16	19/32	7	6 1/2	6 5/8
	3/4	5/8	11/16	8	7 1/4	7 1/2
	1	3/4	25/32	9	8 1/4	8 1/2
	1 1/4	1	1 1/32	10	9 1/4	9 1/2
	1 1/2	1 1/4	1 9/32	11	10 1/4	10 1/2
				12	11 1/4	11 1/2
				14	13 1/4	13 1/2
				16	15 1/4	15 1/2
Dimension				2	1 1/2	1 9/16
				2 1/2	2	2 1/16
				3	2 1/2	2 9/16
	2	1 1/2	1 9/16	3 1/2	3	3 1/16
	2 1/2	2	2 1/16	4	3 1/2	3 9/16
	3	2 1/2	2 9/16	4 1/2	4	4 1/16
	3 1/2	3	3 1/16	5	4 1/2	4 5/8
	4	3 1/2	3 9/16	6	5 1/2	5 5/8
	4 1/2	4	4 1/16	8	7 1/4	7 1/2
				10	9 1/4	9 1/2
				12	11 1/4	11 1/2
				14	13 1/4	13 1/2
				16	15 1/4	15 1/2
Timbers	5 & 6 thick	1/2 off	1/2 off	5 & 6 wide	1/2 off	1/2 off
	7 - 15 thick	3/4 off	1/2 off	7 - 15 wide	3/4 off	1/2 off
	>= 16 thick	1 off	1/2 off	>= 16 wide	1 off	1/2 off

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