Abstract: A jointing element (40) is disclosed for supporting a plurality of cladding panels (10) relative to a building frame (11), the panels having slots (18) extending along the edges thereof, the jointing element including: an elongate support member (20) substantially H shaped in cross-section and having a longer inner flange for fastening to the building or building frame, the inner flange being connected by a web to a shorter outer flange to form an elongate recess on each side of the web for receiving sealing means (30) therein; whereby when a cladding panel is supported relative to the building or building frame by the jointing element, the outer flange is received in the slot along the edge of the cladding panel and the sealing means cooperates with the panel to substantially seal the space behind the cladding panel against the ingress of moisture.