Civil Engineering Design Knookayedge. The following table is Structural Lumber Wood Engineering Properties. Modulus of Elasticity of Wood, Wood Engineering Design Data. 3x8 4x8: Dense Select Structural Select Structural Non Dense Select Struc No. 1 Dense No. 1 No. 1 NonDense No. 2 Dense No. 2 No. 2 NonDense No. 3 and Stud: 660 565 480 660 565 ...