| 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 - S
ee
Tables A-1 thru A-4 for Adjustment Factors |
Size |
Grade |
Extreme
Fiber Stress
in Bending
"Fb" |
Tension
Parallel
to Grain
"Ft" |
Horizontal
Shear
"Fv" |
Compression
Perpendicular
to Grain
"Fc*" |
Compression
Parallel
to Grain
"Fc" |
Modulus
of
Elasticity
"E" |
Single
Member Uses |
Repetitive
Member Uses2 |
2" to 4"
thick,
2" to 4"
wide
Includes:
2x2
2x3
2x4
3x4
4x4 |
Dense Select Structural... |
3050 |
3510 |
1650
|
100
|
660
|
2250
|
1,900,00
|
| Select Structural |
2850 |
3280 |
1600 |
100 |
565 |
2100 |
1,800,00 |
| NonDense Select Struc |
2650 |
3050 |
1350 |
100 |
480 |
1950 |
1,700,00 |
| No.1 Dense |
2000 |
2300 |
1100 |
100 |
660 |
2000 |
1,800,00 |
| No. 1 |
1850 |
2130 |
1050 |
100 |
565 |
1850 |
1,700,00 |
| No. 1 NonDense |
1700 |
1950 |
900 |
100 |
480 |
1700 |
1,600,00 |
| No. 2 Dense |
1700 |
1960 |
875 |
90 |
660 |
1850 |
1,700,00 |
| No. 2 |
1500 |
1720 |
825 |
90 |
565 |
1650 |
1,600,00 |
| No. 2 NonDense |
1350 |
1550 |
775 |
90 |
480 |
1600 |
1,400,00 |
| No. 3 and Stud |
850 |
980 |
475 |
90 |
565 |
975 |
1,400,00 |
| Construction3 |
1100 |
1270 |
625 |
100 |
565 |
1800 |
1,500,00 |
| Standard3 |
625 |
720 |
350 |
90 |
565 |
1500 |
1,300,00 |
| Utility3 |
300 |
345 |
175 |
90 |
565 |
975 |
1,300,00 |
2" to 4"
thick,
5" to 6"
wide
Includes:
2x6
3x6
4x6
|
Dense Select Structural |
2700 |
3100 |
1500 |
90 |
660 |
2150 |
1,900,00 |
Select Structural
|
2550 |
2930 |
1400 |
90 |
565 |
2000 |
1,800,00 |
NonDense Select
Stru |
2350 |
2700 |
1200 |
90 |
480 |
1850 |
1,700,00 |
No.1 Dense |
1750 |
2010 |
950 |
90 |
660 |
1900 |
1,800,00 |
No.
1 |
1650 |
1900 |
900 |
90 |
565 |
1750 |
1,700,00 |
No.
1 NonDense |
1500 |
1720 |
800 |
90 |
480 |
1600 |
1,600,00 |
No.
2 Dense |
1450 |
1670 |
775 |
90 |
660 |
1750 |
1,700,00 |
No.
2 |
1250 |
1440 |
725 |
90 |
565 |
1600 |
1,600,00 |
No. 2 NonDense |
1150 |
1320 |
675 |
90 |
480 |
1500 |
1,400,00 |
No. 3 and Stud |
750 |
865 |
425 |
90 |
565 |
925 |
1,400,00 |
2" to 4"
thick,
8"
wide
Includes:
2x8
3x8
4x84
|
Dense Select Structural |
2500 |
2820 |
1350 |
90 |
660 |
2050 |
1,900,00 |
Select Structural |
2300 |
2650 |
1300 |
90 |
565 |
1900 |
1,800,00 |
| NonDense Select Struc |
2100 |
2420 |
1100 |
90 |
480 |
1750 |
1,700,00 |
No.1 Dense |
1650 |
1900 |
875 |
90 |
660 |
1800 |
1,800,00 |
No. 1 |
1500 |
1730 |
825 |
90 |
565 |
1650 |
1,700,00 |
No. 1 NonDense |
1350 |
1550 |
725 |
90 |
480 |
1550 |
1,600,00 |
No. 2 Dense |
1400 |
1610 |
675 |
90 |
660 |
1700 |
1,700,00 |
No. 2 |
1200 |
1380 |
650 |
90 |
565 |
1550 |
1,600,00 |
No. 2 NonDense |
1100 |
1260 |
600 |
90 |
480 |
1450 |
1,400,00 |
No. 3 and Stud |
700 |
805 |
400 |
90 |
565 |
875 |
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. The Repetitive Member Factor, Cr=1.15,
has been included in the listed Repetitive Member Use design values.
(3) For Construction, Standard, and Utility grades, the Fb, Ft and Fc values apply to
4" wide lumber only.
(4) For lumber 4" thick and 8" or wide, the Fb value can be
multiplied by CF=1.1. |
