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Nds Timber Design Values: DOUGLAS FIR-SOUTH
Construction to Select Structural|4D
NDS (National Design Specification) reference design values for visually graded dimension lumber — bending, tension, shear, compression, and modulus of elasticity
| species | grade | E psi (psi) | Emin psi (psi) | Fb psi (psi) | Fc perp psi (psi) | Fc psi (psi) | Ft psi (psi) | Fv psi (psi) | G | grading rules agency | size classification | standard | table id |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DOUGLAS FIR-SOUTH | Construction | 1,200,000 | 440,000 | 975 | 520 | 1,650 | 600 | 180 | 0.46 | WWPA | 2" - 4" wide | NDS-2018 Supplement | 4A |
| DOUGLAS FIR-SOUTH | No. 1 | 1,300,000 | 470,000 | 925 | 520 | 1,450 | 600 | 180 | 0.46 | WWPA | 2" & wider | NDS-2018 Supplement | 4A |
| DOUGLAS FIR-SOUTH | No. 2 | 1,200,000 | 440,000 | 850 | 520 | 1,350 | 525 | 180 | 0.46 | WWPA | 2" & wider | NDS-2018 Supplement | 4A |
| DOUGLAS FIR-SOUTH | No. 3 | 1,100,000 | 400,000 | 500 | 520 | 775 | 300 | 180 | 0.46 | WWPA | 2" & wider | NDS-2018 Supplement | 4A |
| DOUGLAS FIR-SOUTH | No.1|Beams and Stringers|4D | 1,200,000 | 440,000 | 1,300 | 520 | 850 | 625 | 165 | 0.46 | WWPA | Beams and Stringers | NDS-2018 Supplement | 4D |
| DOUGLAS FIR-SOUTH | No.1|Posts and Timbers|4D | 1,200,000 | 440,000 | 1,150 | 520 | 925 | 775 | 165 | 0.46 | WWPA | Posts and Timbers | NDS-2018 Supplement | 4D |
| DOUGLAS FIR-SOUTH | No.2|Beams and Stringers|4D | 1,000,000 | 370,000 | 825 | 520 | 550 | 425 | 165 | 0.46 | WWPA | Beams and Stringers | NDS-2018 Supplement | 4D |
| DOUGLAS FIR-SOUTH | No.2|Posts and Timbers|4D | 1,000,000 | 370,000 | 675 | 520 | 650 | 450 | 165 | 0.46 | WWPA | Posts and Timbers | NDS-2018 Supplement | 4D |
| DOUGLAS FIR-SOUTH | Select Structural | 1,400,000 | 510,000 | 1,350 | 520 | 1,600 | 900 | 180 | 0.46 | WWPA | 2" & wider | NDS-2018 Supplement | 4A |
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