ThermaSteel manufactures composite structural insulated panels that combine light-gauge steel framing with expanded-polystyrene insulation. The panels are used for exterior walls and building envelopes in houses and commercial structures, with project-specific engineering and fabrication coordinated through dealers, designers and installers.

The system can reduce separate framing and insulation steps. Buyers should confirm code reports, panel spans, openings, electrical routing, exterior finish attachment, freight, approved installers and warranty scope.