Clayco Construction - Supplies materials and designs concrete that is cast on-site. Star Construction - Designs and builds cast-in-place and tilt-up concrete systems for commercial and industrial applications. CL Ridgeway LLC. - Designs and builds reinforced concrete buried arch systems that are used for applications such as bridges, tunnels and culverts. Hadrian Tridi-Systems - Produces a building system using prefab polystyrene panels with wire mesh that becomes a structural wall when concrete, gunnite, plaster, and stucco are shotcreted into place. National Solarcrete Inc. - Building system uses shotcrete and polystyrene to form insulated concrete wall panels. Tilt-up - An educational resource on tilt-up construction and concrete buildings for general contractors and the public.