Abstract: A thermally broken truss (10) for a cage of a structural building panel, comprising: first and second elongate outer support members (12, 14); first and second elongate intermediate support members (16, 18) interposed between the first and second outer support members (12, 14); at least one first connecting member (20) interconnecting the first outer support member (12) and the first intermediate support member (16); at least one second connecting member (22) interconnecting the second outer support member (14) and the second intermediate support member (18); and a thermally insulative fastener (24) which fastens the first and second intermediate support members (16, 18) together in spaced apart relationship, thereby providing a thermal break between the first and second outer support members (12, 4). A thermally broken structural building panel (40) is also provided.