Values are given in pounds per square inch (psi)
These tables compare design values for Southern Pine lumber and other major commercial species used in the U.S. The tables are based on results of the North American In-Grade Testing Program completed in 1991. These tests confirmed that Southern Pine is the Strongest Species for engineered and framing applications.
Tabulated design values are based on normal loading conditions. Because the strength of wood varies with conditions under which it is used, these design values should only be applied in conjunction with appropriate design and service recommendations from the NDS. Tabulated design values must be multiplied by all applicable adjustment factors to determine allowable design values.
| 2x10 |
Property
|
Southern
Pine
|
Douglas
Fir-Larch
|
Hem-Fir
|
Spruce-
Pine-Fir
|
Spruce-
Pine-Fir
(South)
|
Select
Structural
|
Extreme Fiber Stress in Bending, Fb
Tension parallel-to-grain, Ft
Compression parallel-to-grain, Fc
Modulus of Elasticity, E
|
2,050
1,100
1,850
1,800,000
|
1,595
1,100
1,700
1,900,000
|
1,540
990
1,500
1,600,000
|
1,375
740
1,400
1,500,000
|
1,430
635
1,200
1,300,000
|
|
No. 1
|
Extreme Fiber Stress in Bending, Fb
Tension parallel-to-grain, Ft
Compression parallel-to-grain, Fc
Modulus of Elasticity, E
|
1,300
725
1,600
1,700,000
|
1,100
745
1,450
1,700,000
|
1,045
660
1,300
1,500,000
|
960
470
1,100
1,400,000
|
935
440
1,050
1,200,000
|
|
No. 2
|
Extreme Fiber Stress in Bending, Fb
Tension parallel-to-grain, Ft
Compression parallel-to-grain, Fc
Modulus of Elasticity, E
|
1,050
575
1,500
1,600,000
|
965
635
1,300
1,600,000
|
935
550
1,250
1,300,000
|
960
470
1,100
1,400,000
|
825
360
975
1,100,000
|
|
No. 3
|
Extreme Fiber Stress in Bending, Fb
Tension parallel-to-grain, Ft
Compression parallel-to-grain, Fc
Modulus of Elasticity, E
|
600
325
850
1,400,000
|
550
360
750
1,400,000
|
550
330
725
1,200,000
|
550
275
625
1,200,000
|
470
220
550
1,000,000
|
SOURCES
These tables are for comparison purposes only, and do not provide complete design information. For more design details, see the National Design Specification® (NDS®) for Wood Construction published by the American Forest & Paper association, the Southern Pine Use Guide published by the Southern Pine Council, and the following sources used for this publication:
Southern Pine
Southern Pine Council: Maximum Spans for Southern Pine Joists & Rafters, 5/93.
Southern Pine Inspection Bureau: Standard Grading Rules for Southern Pine Lumber, 1994 Edition.
Douglas Fir-Larch, Hem-Fir and Spruce-Pine-Fir (South)
Western Wood Products Association: Western Lumber Size-Adjusted Values, 2/92, and Western Lumber Span Tables, 2/94.
Spruce-Pine-Fir
Canadian Wood Council: Canadian Dimension Lumber Data Book, 1/92, and The U.S. Span Book for Canadian Lumber, 1993.
Species Comparisons |
2x4 |
2x6 |
2x8 |
2x10 |
2x12
|
