Southern Pine Products (Southern Forest Products Association)

SOUTHERN PINE DESIGN VALUES

Based on 1994 SPIB Grading Rules Values in pounds per square inch (psi)

Table 1 Dimension Lumber - 2" to 4" thick, 2" and wider
Based on Normal Use Conditions (MC< 19%)¹ - See Tables A-1 thru A-4 for Adjustment Factors
Size	Grade		Extreme Fiber Stress in Bending "F_b"				Tension Parallel to Grain "F_t"		Horizontal Shear "F_v"		Compression Perpendicular to Grain "F_c*"		Compression Parallel to Grain "F_c"		Modulus of Elasticity "E"
			Single Member Uses		Repetitive Member Uses²
2" to 4" thick, 10" wide Includes: 2x10 3x10 4x10³	Dense Select Structural		2150		2470		1200		90		660		2000		1,900,00
	Select Structural		2050		2360		1100		90		565		1850		1,800,00
	NonDense Select Struc		1850		2130		950		90		480		1750		1,700,00
	No.1 Dense		1450		1670		775		90		660		1750		1,800,00
	No. 1		1300		1500		725		90		565		1600		1,700,00
	No. 1 NonDense		1200		1380		650		90		480		1500		1,600,00
	No. 2 Dense		1200		1380		625		90		660		1650		1,700,00
	No. 2		1050		1210		575		90		565		1500		1,600,00
	No. 2 NonDense		950		1090		550		90		480		1400		1,400,00
	No. 3 and Stud		600		690		325		90		565		850		1,400,00
2" to 4" thick, 12" wide Includes: 2x12 3x12 4x12³	Dense Select Structural		2050		2360		1100		90		660		1950		1,900,00
	Select Structural.		1900		2190		1050		90		565		1800		1,800,00
	NonDense Select Struc		1750		2010		900		90		480		1700		1,700,00
	No.1 Dense		1350		1550		725		90		660		1700		1,800,00
	No. 1		1250		1440		675		90		565		1600		1,700,00
	No. 1 NonDense		1150		1320		600		90		480		1500		1,600,00
	No. 2 Dense		1150		1320		575		90		660		1600		1,700,00
	No. 2		975		1120		550		90		565		1450		1,600,00
	No. 2 NonDense		900		1040		525		90		480		1350		1,400,00
	No. 3 and Stud		575		660		325		90		565		825		1,400,00
(1) Moisture designations KD19, KD15,, S-DRY, MC15 and MC19 all have identical design values. (2) Repetitive member uses apply to joists, truss chords, rafters, studs, planks, decking or similar members which are in contact or spaced not more than 24" on center, are not less than three [3] in number, and are joined by floor, roof or other load distributing elements adequate to support the design load. (3) For lumber 4" thick and 8" or wider, the Fb value can be multiplied by CF=1.1 (4) For lumber wider than 12", multiply these 12" width values by CF=.90 for Fb, Ft, and Fc values, and CF= 1.00 for Fv, Fc*, and E values.
Table 2 Timbers - 5" x 5" and larger
Based on Dry or Wet Service Conditions - See Tables A-1 and A-3 for Adjustment Factors
Size		Grade		Extreme Fiber Stress in Bending "F_b"¹				Tension Parallel to Grain "F_t"		Horizontal Shear "F_v"		Compression Perpendicular to Grain "F_c*"		Compression Parallel to Grain "F_c"		Modulus of Elasticity "E"
				Single Member Uses
5" x 5" and larger		Dense Select Structural		1750		2470		1200		110		440		1100		1,600,00
		Select Structural		1500		2360		1000		110		375		950		1,500,00
		No.1 Dense		1550		1670		1050		110		440		975		1,600,00
		No. 1		1350		1500		900		110		375		825		1,500,00
		No. 2 Dense		975		1380		650		110		440		625		1,300,00
		No. 2		850		1210		550		110		5375		525		1,200,00
(1) When the depth, d, of a timber exceeds 12", the tabulated bending design value, Fb, shall be multiplied by the following size factor: C_F=(12/d) ^1/9where d is the actual depth of the member

Southern Pine Products - Page 10