What is the aspect of the beam that is specified in the joist span calculation?

In the context of joist span calculations, the thickness of a beam is a crucial aspect because it directly influences the structural integrity and loading capacity of the beam. The thickness contributes to the overall strength and stiffness of the beam, affecting how it can support loads without excessive deflection or failure.

When engineers or carpenters calculate the allowable span for a beam or joist, they consider the thickness along with other dimensions to determine how the beam will perform under various loads. A thicker beam typically provides greater resistance to bending and shear forces, allowing for longer spans while maintaining safety and functionality.

Other factors like length, material type, or the number of plies also play significant roles in structural calculations, but when determining joist spans specifically, the thickness is a fundamental parameter that must be accurately specified to ensure the beam can perform effectively within its designated application.