What are the durability requirements for wood used in pedestrian infrastructure?

... (MSR) lumber, laminated veneer lumber (LVL) and LVL flanged I-joists. The MSR Lumber had a higher torsional rigidity than both the LVL and LVL I-joists. CBLs ... Availability of MSR lumber and engineered wood products with relatively high strengths. Past improvements in metal plate connectors. Increased number and size ... MSR is lumber that has modulus of elasticity E evaluated by mechanical stress equipment, with each piece being marked to indicate the modulus of elasticity E. MSR (machine-stress rated) lumber starts with the finest fiber, guaranteeing strength and stiffness, with consistent dimensional stability. NDS groups MSR & MEL into “Mechanically Graded Dimension Lumber”. MSR & MEL only apply to dimension lumber 2” thick. Wood Education Institute. Page 14 ... Our MSR (machine stress-rated) dimension lumber offers guaranteed strength and superior straightness, making it ideal for highly demanding engineering ... MSR Lumber Producers Council ... Established in 1987, the MSR Lumber Producers Council (MSRLPC) represents the interests of machine stress rated lumber producers ... MSR 1650 is also graded for appearance and has a #1 face. MSR 1650 is lumber graded for both fiber quality and appearance. It is stronger than #2&btr, and ... However, MSR lumber is based entirely on the tested properties. As a result, MSR lumber from different species can be the same MSR grade, as long as they ... 2 x 4 and 2 x 3 in. Lengths 6 to 9 ft. Grade SPS 3 (jointed for vertical use). MSR Lumber.