What is the maximum taper cut allowed at the ends of ceiling joists?

The maximum taper cut allowed at the ends of ceiling joists is one-fourth the depth of the member. This standard is based on structural integrity and safety considerations. Tapering or cutting the end of a joist reduces its effective depth, which can compromise the load-carrying capacity of the joist if done excessively. Thus, limiting the taper cut to one-fourth of the depth ensures that there remains sufficient cross-sectional area and moment of inertia to adequately support the intended loads.

By adhering to this maximum taper cut, builders and inspectors help ensure the longevity and safety of the structure, allowing joists to function as required without unnecessary weakening. This guideline is crucial in achieving a balance between necessary modifications for installation and the structural needs of the building.