for economy of material short clips are employed and are spaced along a roofing member at intervals of several feet as can be seen from fig1 and 2 the suspension clip 27 is connected to a roofing member such as 13 with flanges 33 34 snap locked into detents 25 26 the bar 28 of the clip lies along the underside of the roofing member and assists in maintaining the parts in connected position by reason of the springiness of the material if it is desired to have a maximum spacing and a maximum thickness of insulation between the roofing members and the ceiling panels the suspension clip 27 is installed in the configuration shown in fig5 but if a closer spacing is needed one or two sets of ceiling panel engaging elements are cut off each depending leg of the clip thus in the embodiment shown in fig1 the clip has been foreshortened so that the uppermost set of ceiling panel engaging elements is the one employed to engage the ceiling panel in the embodiment of fig7 one set of ceiling panel engaging elements has been cut off the clip to provide an intermediate thickness of insulation the ceiling panels of the invention are generally channel shaped elongated metal elements designated 38 in the drawings the base of the channel may have a groove 39 formed therein for longitudinal stiffening and the junctions of the legs and base of the channel may be beveled as at 40 41 the grooves and bevels also provide a decorative effect on the underside of the ceiling the legs or sidewalls of the channel are designated 42 43 and are provided with downwardly and inwardly extending flanges 44 45.