, GD&T Training Geometric Dimensioning Tolerancing. The Lumber Properties Program was conducted as a cooperative project … Physical properties refer to density and moisture relations that affect its use. This lesson covers the physical and mechanicalproperties of wood. } Modulus of elasticity also referred to as Tensile Modulus or Young's Modulus. Span Tables Use the span tables below to determine allowable lengths of joists and rafters, based on size and standard design loads. Wood Strengths Hits: 545591 The table below provides laboratory values for several properties of wood that are associated with wood strength. When the panel strength axis is placed parallel to framing supports, the three-span condition is used for support spacing up to and including 16 inches on center. {{ links..." />