What is the maximum permitted depth for notches in the top or bottom of joists?

The maximum permitted depth for notches in the top or bottom of joists is one-sixth of the joist depth. This regulation is significant as it addresses structural integrity and load-bearing capacity. Notching a joist reduces its cross-sectional area and can weaken the joist if the notch exceeds certain dimensions. Allowing notches up to one-sixth of the joist depth strikes a balance between practical construction needs and maintaining sufficient strength, ensuring safety and stability in the structure. Understanding these limits helps prevent potential risks such as joist failure, which could lead to serious safety hazards in the building.