Douglas Fir-Larch, Select Structural - Design Values

Douglas Fir-Larch, Select Structural is a dimensional lumber grade with reference design values to NDS 2018 Supplement Table 4A. Its reference bending value Fb is 1,500 psi, compression parallel Fc is 1,700 psi, and modulus of elasticity E is 1,900,000 psi (NDS). Values are shown before adjustment factors; apply the relevant NDS C-factors or EC5 k_mod and γ_M for your load case.

Fb (bending): 1,500 psi
Fc (compression): 1,700 psi
E (modulus): 1.9M psi

Reference design values (NDS 2018)

Fb	Bending	1,500 psi
Ft	Tension parallel	1,000 psi
Fv	Shear parallel	180 psi
Fc⊥	Compression perpendicular	625 psi
Fc	Compression parallel	1,700 psi
E	Modulus of elasticity	1,900,000 psi
Emin	Modulus for stability	690,000 psi
G	Specific gravity	0.5

Common supplied sizes

Nominal	Actual (in)	Metric (mm)
2x4	1.5 x 3.5	38 x 89
2x6	1.5 x 5.5	38 x 140
2x8	1.5 x 7.25	38 x 184
2x10	1.5 x 9.25	38 x 235
2x12	1.5 x 11.25	38 x 286

Source: NDS 2018 Supplement Table 4A. Reference values are shown before adjustment factors (NDS C-factors / EC5 k_mod, γ_M) - apply these per your load case in design.

Other Dimensional Lumber grades

Douglas Fir-Larch, No. 1 Douglas Fir-Larch, No. 2 Douglas Fir-Larch, No. 3 Hem-Fir, Select Structural Hem-Fir, No. 1 Hem-Fir, No. 2 Spruce-Pine-Fir, Select Structural Spruce-Pine-Fir, No. 1/No. 2 Spruce-Pine-Fir, No. 3 Southern Pine, Select Structural

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