What is the maximum notch allowed at the end of a joist?

The maximum notch allowed at the end of a joist is 1/4 of the depth. This guideline is essential for maintaining the structural integrity of the joist. Notching the joist reduces its ability to carry loads and can compromise its strength. Therefore, limiting notches to one-fourth of the depth helps ensure that enough material remains to support structural loads without failing.

This limitation must also be understood in the context of the joist's overall function; excessive notching can lead to weaknesses, ultimately resulting in sagging or even failure under load. It’s crucial for builders and contractors to adhere to these specifications to ensure safety and compliance with building codes.