A new concept of thin shell concrete roof construction appears to be in the offing as an outgrowth of research studies carried on over the past two years in the structural laboratories of Purdue University. Not the least of several appealing features of the technique is its comparative simplicity. It uses foamed plastic planks to serve as a temporary support during the application of the structural concrete roof; the forming material bonds with the concrete shell to become a permanent part of the roof structure, serving the dual function of providing thermal insulation and vapor barrier protection. One of the chief advantages anticipated for this method of constructing thin shell concrete roofs is the possibility of effecting substantial reductions in the cost of erecting falsework and building conventional forms. Although the investigative work carried on at Purdue University was not intended to provide cost data, it is believed that field experience with the new construction technique will rather quickly reveal some major cost advantages over presently used methods. The Purdue research group is continuing to explore other possibilities of thin shell construction using expanded polystyrene form boards. Plans are also in progress for building a partially enclosed structure with a 30 foot square hyperbolic paraboloid roof of structural thin shell concrete. But the basic technique is now being turned over to engineers, architects and builders for development in the field. It seems virtually certain that this promising start will be followed up with the same enthusiasm and energy with which the building industry greets all developments relating to concrete construction.