Roof insulation support

A roof insulation support, for a building roof of the type having a parallel array of longitudinally extending purlins each of said purlins including a longitudinally extending upturned lip disposed on the bottom of the purlins, said roof insulation support comprising in combination:

• a plurality of elongated longitudinally extending hangers each of said hangers comprising:
• (i) a generally vertical web;
• (ii) fastening means disposed on the top of said vertical web for supporting said hangers from the upturned lip on each purlin;
• (iii) first and second lower hanger flanges depending from opposing sides and adjacent the bottom of said vertical web;
• and
• (iv) first and second upper hanger flanges depending from opposing sides of said vertical web, said upper hanger flanges being upwardly spaced from said lower hanger flanges and roughly parallel thereto;
• a plurality of transversely extending beams extending between said hangers, said beams having a roughly I-shaped cross section defining a lower beam flange and an upper beam flange, said beams having a vertical height equal to the spacing between said upper and lower hanger flanges and the ends of said beams being received between said upper and lower hanger flanges of adjacent hangers to torsionally stabilize said beams;
• and
• a plurality of planar roof insulation support panels supported by said lower hanger flanges and said lower beam flanges.