Structural unit comprising a truss and fibrous cementitious slab building element connected together

A structural unit for a building comprising:

• at least one truss;
• at least one fibrous cementitious building element;
• and
• at least one connection member configured to connect the at least one truss to the at least one fibrous cementitious building element,
• wherein,
• the connection member is integral with the building element and accessible for connection of the at least one truss to the building element,
• the connection member is in the form of a plate(s),
• the plate(s) is fixed to a top chord of the truss,
• the plate(s) is configured so that the plate(s) stands proud of the top chord of the truss, and
• the plate(s) is configured so that it does not protrude through the surface of the fibrous cementitious building element when connected to the truss after pouring and setting of cementitious material.