Maximum Floor Joist Span - The Engineering ToolBox

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Maximum floor joist span for No. 1 and No. 2 Grade of Douglas fir are indicated below. Max. dead load (weight of structure and fixed loads) 10 lbs/ft2. Live load is weight of furniture, wind, snow and more.

• 1 psf (lbf/ft2) = 47.88 N/m2
• 1 ft = 0.3048 m
• 1 in = 25.4 mm

Max. Live Load 30 lbs/ft2 (1436 N/m2)

Maximum Floor Joist Span, Live Load 30 lbs/ft2 (1436 N/m2) (ft - in)

Nominal Size (inches)	Joist Spacing Center to Center (inches)	Lumber Grade
		Selected Structural	No. 1	No. 2
2 x 6	12	12' - 6'"	12' - 0"	11' - 10"
	16	11' - 4"	10' - 11"	10' - 9"
	24	9' - 11"	9' - 7"	9' - 1"
2 x 8	12	16' - 6"	15' - 10"	15' - 7"
	16	15' - 0"	14' - 5"	14' - 1"
	24	13' - 1"	12' - 4"	11' - 6"
2×10	12	21' - 0"	20' - 3"	19' - 10"
	16	19' - 1"	18' - 5"	17' - 2"
	24	16' - 8"	15' - 0"	14' - 1"
2 x 12	12	25' - 7"	24' - 8"	23' - 0"
	16	23' - 3"	21' - 4"	19' - 11"
	24	20' - 3"	17' - 5"	16' - 3"

Max. Live Load 60 lbs/ft2 (2873 N/m2)

Maximum Floor Joist Span, Live Load 60 lbs/ft2 (1436 N/m2) (ft - in)

Nominal Size (inches)	Joist Spacing Center to Center (inches)	Lumber Grade
		Selected Structural	No. 1	No. 2
2 x 8	12	13' - 1"	12' - 7"	12' - 4"
	16	11' - 11"	11' - 5"	10' - 8"
	24	10' - 5"	9' - 4"	8' - 8"
2×10	12	16' - 8"	16' - 1"	15' - 0"
	16	15' - 2"	13' - 11"	13' - 0"
	24	13' - 3"	11' - 4"	10' - 7"
2 x 12	12	20' - 3"	18' - 7"	17' - 5"
	16	18' - 5"	16' - 1"	15' - 1"
	24	15' - 10"	13' - 2"	12' - 4"
2 x 14	12	23' - 11"	20' - 10"	19' - 5"
	16	21' - 8"	18' - 0"	16' - 10"
	24	17' - 9"	14' - 8"	13' - 9"

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Unit Converter

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