Abstract: A roof insulation support for a building roof of the type having a parallel array of longitudinally extending roof supporting purlins, each of the purlins including a longitudinally extending upturned lip. The roof support comprises a plurality of elongated longitudinally extending hangers, each hanger including a generally vertical web and a hook disposed on the top of the vertical web for supporting the hanger from the upturned lip of the purlins. First and second lower hanger flanges depends from both sides of the bottom of the vertical web and first and second upper hanger flanges are spaced upwardly on the vertical web from the first lower flange. A plurality of transversely extending beams of roughly I-shape cross section extend between the hangers. The ends of the beams are received between the upper and lower hanger flanges of adjacent hangers.