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| Design Values & Spans for Pressure-Treated Southern Pine |
Design values published in the SPIB Grading Rules for Southern Pine
Lumber, 2002 Edition, apply to both treated and untreated Southern Pine.
Design values for dimension lumber are based on normal use conditions
(moisture content of 19% or less). These values are intended for use in covered
structures or where the moisture content in use does not exceed 19% for an
extended period of time. For applications where the moisture content will
exceed 19% for an extended period, tabulated Southern Pine design values
must be multiplied by the appropriate wet-service factor, CM . Refer to Table A-2 below.
WET SERVICE ADJUSTMENT FACTORS
Table A-2: Wet-Service Factor, CM
For lumber 2" to 4" thick; applies to all values
|
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
|
| 0.851 |
1.00 |
0.97 |
0.67 |
0.802 |
0.90 |
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