What is the maximum depth for notches in solid lumber members found at any location besides the ends or middle?

The maximum depth for notches in solid lumber members located anywhere other than the ends or the middle of the beam is set at one-third of the depth of the member. This guideline is established to maintain the structural integrity and load-carrying capacity of the lumber. Notches that exceed this maximum depth can lead to weakened areas within the lumber, potentially compromising the overall stability and safety of the structure.

In practical terms, this means that if you have a beam that is, for example, 12 inches deep, the maximum depth of a notch that can be taken out anywhere along the length—excluding the ends or the middle—would be 4 inches, which is one-third of 12 inches. This ensures that there is sufficient material left to support the loads applied to the beam without introducing failure points.

Understanding this limit is essential for contractors to ensure compliance with building codes and standards that prioritize safety and durability in construction practices.