Abstract: Disclosed is a monolithic prefabricated structure that is wind and impact resistant. This special pre-cast lightweight concrete structure is a blend of special aggregates and additives combined to resist the impacts of flying debris and extremes of weather. The curved exterior surface minimizes wind friction and deflects debris. The circular structure has a low center of gravity and firm attachment to a floor made of concrete. It has protected ventilation openings, viewing ports and a strong smooth-fitting door.

Abstract: Disclosed is a building system with an unusual combination of foam plastic and common structural members. Flanged steel structural members are inserted through openings in wire trusses and the resulting assembly is fused together with foam plastic inside a large mold. Multiple copies of said assemblies are molded into a single large block of polystyrene. This method provides for subsequent separation of the panels using conventional hot wire cutting equipment. The separated assemblies have flat flanges that project toward the panel faces but are hidden under a thin layer of foam plastic. Access to these flanges allows mechanical attachment of panel-joining membranes and a wide variety of surface finish materials. This method simultaneously provides smooth polystyrene surfaces for adhesive attachment of some finishes, including those that utilize glass fiber mesh.