Following its SpaceJoist SJ10 (254mm) web launch last year, ITW Industry has introduced SJ9 (219mm) and SJ12 (304mm) webs to complete the range of its joist depths of 219, 254 and 304mm.Extensive research and development by ITW Industry has produced SpaceJoist “SJ” open web joists that achieve longer spans with less timber and fewer webs than both its predecessors and …