The THERMOMASS Building System is a patented, highly energy-efficient insulation system for concrete sandwich walls, developed and manufactured by Composite Technologies Corporation (CTC). The two components of Thermomass are rigid insulation and CTC manufactured fiber-composite connectors. They combine to create a load-bearing, durable, moisture resistant, highly energy-efficient concrete sandwich wall. This remarkable insulation system offers unlimited design flexibility and is durable and virtually maintenance-free.