How many inches must the ends of joists, beams, or girders bear on masonry or concrete?

The correct requirement for the bearing of the ends of joists, beams, or girders on masonry or concrete is a minimum of 1/2 inch. This standard is set to ensure adequate support and to prevent potential issues such as cracking or shifting that can occur if the structural members do not have sufficient bearing. A minimum of 1/2 inch allows for a stable connection while still providing enough margin for any minor variations in the materials or construction practices.

When these structural components are properly supported, it contributes to the overall stability and integrity of the building structure, taking into consideration factors like load distribution and potential movement over time. This specification is crucial for maintaining safe and effective construction practices.