Sto Corp. supplies prefabricated exterior wall assemblies through the StoPanel system rather than complete modular buildings.

Panels combine cold-formed steel framing, sheathing, air and water-resistive barriers, insulation and selected cladding or finish systems in a factory-built envelope component. Sto provides tested assemblies, design-assist resources, specifications, details and technical support, while approved affiliate fabricators manufacture panels and project contractors install them on the building structure.