plant setup. All of these concrete type structures were investigated for various combinations of roofs, such as cement asbestos, plywood, common wood sheathing, Gypsum slabs, galvanized iron and corrugated aluminum on wood trusses and also on metal trusses of galvanized iron or aluminum. Composition roofing was used over the Gypsum, plywood and common wood sheathing. The cost analysis of the above concrete type structures showed the cast in place concrete as being highest and the concrete blocks with galvanized iron or corrugated aluminum sheets on wood trusses being the cheapest. This range was from $35.00 per square foot to $23.00 per square foot. Aside from the cost element there are other features that are not advantageous of which the cooling problems are probably the most serious. In the concrete block building with double aluminum roof, it is not feasible to make a high percentage of the wall areas open for cross ventilation. It is therefore considered necessary to provide mechanical ventilation to make said structures livable and such added expense is not deemed justifiable. The analysis of wood frame structures with various roof and wall coverings showed that prefabricated buildings using plywood coverings could be erected for approximately $10.00 per square foot. Maintenance costs, however, are anti- cipated to be fairlyhigh due to peeling of plywood and its warping when exposed to the weather. The wall areas can be opened up for fair cross ventilation but | not enough to be considered adequate for comfort. Cement asbestos siding and roof sheets on wood frame construction can be built for approximately $10.50 per square foot, but maintenance costs anticipated due to their brittleness is high- er than for plywood panels. The same ventilation problems are to be expected as noted for plywood covered frames. Galvanized steel or aluminum sheet covering on wood frames are comparable to above in cost as the saving in siding is counterbalanced by the extra cost of Iv = 12