Even if a product has a high MOE value, this does not necessarily mean it is a safer product or will support as much weight as a plank with a lower MOE but high fiber bending value. To put it in simplistic terms, the higher the fiber bending strength, the more weight a plank will support before fracturing or breaking, and the higher the modulus of elasticity, the more rigid or stiff the plank will feel beneath one’s feet. The modulus of elasticity is the measurement of the plank’s stiffness, or the association between the amount a board will deflect downward and the load which causes this deflection. The higher the fiber bending value, the more load the plank will handle before fracturing or reaching its breaking point. The fiber bending value corresponds to the board’s resistance against an applied load and the relative tension and compression of the wood fiber within the plank. Since scaffold plank is used “flatwise,” the two most critical design properties used to determine a board’s ability to support specified loads over given spans are the fiber bending (Fb) value and the modulus of elasticity (MOE, or technically speaking, E). You should pay particular attention to the physical design properties of the product being considered, specifically, strength and stiffness values, which have been determined through extensive laboratory testing in accordance with the ASTM Standards for Structural Composite Lumber Products. Regardless of what wood plank type (manufactured or solid sawn) you are in favor of, it is important to understand the key elements of wood plank as they relate to performance. Aside from traditional solid sawn lumber planks that are visually graded to meet OSHA standards, there are various types and qualities of manufactured or laminated wood scaffold boards to consider. Nowadays, the product offering of wood scaffold plank is quite diverse. ![]() ![]() Wood scaffold plank is undoubtedly a critical component within scaffold assemblies, as worker safety depends on the performance of the planks on which they stand. Subscribe to Masonry Messenger to receive the masonry resources and information you need to stay current.
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