What are the cross members that connect the rafters in a roof framed structure known as?

The cross members that connect the rafters in a roof-framed structure are known as purlins. Purlins provide essential support to the roof by helping to distribute loads and create a solid framework for roofing materials. They run perpendicular to the rafters and can be installed at various intervals depending on the design and type of roofing being used. Their role is crucial in maintaining the structural integrity of the roof and ensuring it can withstand various environmental stresses, such as wind and snow loads.

Braces, on the other hand, are typically used to provide lateral support to structures and are not specifically the members connecting rafters. Struts are reinforcing components that can help transfer loads in a framing system, but they do not serve the same function as purlins. Joists are members that support floors or ceilings rather than roofs, distinguishing them from the purpose and placement of purlins.