A deck platform hanger/joist runner includes a flat platform, and a joist engager coupled to the flat platform. The joist engager includes a top joist engagement structure having a top joist engager and a bottom joist engagement structure having a bottom joist engager. The top joist engagement structure includes a pivot point configured to engage with a joist to pivot the deck platform hanger to engage the joist with the top joist engager and the bottom joist engager

A deck platform hanger/joist runner includes a flat platform, and a joist engager coupled to the flat platform. The joist engager includes a top joist engagement structure having a top joist engager and a bottom joist engagement structure having a bottom joist engager. The top joist engagement structure includes a pivot point configured to engage with a joist to pivot the deck platform hanger to engage the joist with the top joist engager and the bottom joist engager.

A support strut for a void platform providing support across a building void is disclosed including an elongate support member having two opposed ends and floor mounting brackets mounted on each end. Each floor mounting bracket includes a hollow tube forming a mounting formation for mounting on the support member, and an angle section, including a wall plate on which the tube is located and a transverse flange, for mounting on an external support. The flange of one floor mounting bracket is positioned uppermost for extending across an upper surface of a bottom plate of a wall frame, and the other horizontal mounting bracket is inverted so that the flange is positioned lowermost for extending across a floor adjacent to the void. A void platform including a support strut and a deck joiner bracket is also disclosed.