designated 10 is shown in operative association with a pair of joists 12 forming the overlying support structure for a ceiling 14 in most residential housing and in many commercial buildings the joists 12 are conventially formed of wood and are capable of supporting considerable amounts of weight in contradistinction thereto the ceiling 14 is formed of lath base and plaster or is formed of 34 sheetrock 34 panels and is not a weight bearing structure the illustrated ceiling mounting fixture 10 comprises a pair of opposed joist engagement blocks 16 each having a generally rectangular base section 18 and a plurality suitably four of outwardly extending lance points 20 the base section 18 of the joist engagement blocks 16 conveniently may include a nut 22 for threadedly mounting such blocks 16 on the oppositely threaded ends 24 and 26 of an elongate support member generally designated 28 the elongate support member 28 may be provided in various lengths sized to be accommodated intermediate rafters of predetermined spacing if desired one of such available lengths can be markedly oversized to permit selective cutting of the threaded ends 24 and 26 by a user to accommodate the same to the exigencies.