A climbing screen support system comprising a support rail fixable to a surface adjacent an edge of a structure; a mounting arm slidably securable to the rail so as to confine movement of the mounting arm in a linear direction along the support rail; and a climbing shoe attachable to an end of the mounting arm, wherein the support system is configured such that the mounting arm may be securely mounted to the support rail remote from the edge of the structure and subsequently slideable along the support rail such that the climbing shoe protrudes from the edge of the structure by a predetermined distance.