What is the minimum bearing requirement for arch joists on masonry?

The minimum bearing requirement for arch joists on masonry is set at 1/4 inch. This specification is critical in ensuring that the joists have adequate support, allowing for proper load distribution and stability within the structure. An insufficient bearing surface can lead to structural issues, including potential joist failure or cracking in the masonry due to uneven load transfer.

In the context of building codes and structural integrity, this minimum bearing surface is designed to provide a safe and secure foundation necessary for the performance of the arch joists, while balancing concerns for cost-effective construction methods. The requirement reflects both performance and safety standards established in building practices, ensuring that arches, which can bear significant loads due to their shape and function, are adequately supported.