Pset_MaterialWood This is a collection of properties applicable to wood-based materials that specify kind and grade of material as well as moisture related parameters. IfcMaterial/Wood IfcMaterial/Wood Species Wood species of a solid wood or laminated wood product. Species StrengthGrade Grade with respect to mechanical strength and stiffness. Strength Grade AppearanceGrade Grade with respect to visual quality. Appearance Grade Layup Configuration of the lamination. Layup Layers Number of layers. Layers Plies Number of plies. Plies MoistureContent Total weight of moisture relative to oven-dried weight of the wood. Moisture Content DimensionalChangeCoefficient Weighted dimensional change coefficient, relative to 1% change in moisture content. Dimensional Change Coefficient ThicknessSwelling Swelling ratio relative to board depth. Thickness Swelling