How far should cantilevered joists extend inward based on their overhang?

Cantilevered joists should extend inward to a distance that is generally recognized as three times the length of their overhang. This guideline is based on structural integrity and load distribution principles in carpentry. When a joist is cantilevered, it experiences bending forces that must be managed effectively to prevent sagging or structural failure. By extending the joist inward a distance equal to three times the overhang, the additional length provides necessary support and helps to balance the load that is being applied to the joist from the weight of materials and environmental factors.

This approach in design also contributes to the overall stability of the structure, ensuring that the cantilevered section can perform effectively without compromising the safety or functioning of the building. Such practices are essential in maintaining compliance with building codes and standards, which aim to ensure the reliability and longevity of construction projects.