Metal panel roofing structure

In a roof structure having horizontally extending support purlins, the combination of a plurality of elongated roof panels located side by side and supported on said purlins, the lengths of said panels extending transversely to the lengths of said purlins, adjacent panels having edges interlocked with each other to form joints that join the panels together, an insulative layer supported on said purlins between and in contact with said panels and purlins and covering substantially the same total area as said panels, panel mounting clips having upwardly projecting tab portions secured to said panels and base portions bearing against the upper side of said insulative layer and secured to said purlins to provide means for attaching the panels to the purlins, said tab portions extending into said joints to mechanically secure said clip to said adjacent panels, means flexibly attaching said tab portions to said base portions in relatively movable relationship to provide for movement of said panels relative to said purlins, and insulative thermal blocks extending lengthwise of and directly over said purlins and bearing against the upper side of said insulative layer on said purlins, said blocks extended between the base portions of adjacent panel mounting clips, said base portions having tangs thereon which project into ends of said thermal blocks holding said blocks in place, said panels being supported on the tops of said thermal blocks.