The THERMOMASS Building Insulation System is a unique, patented, pre-engineered, insulated concrete sandwich wall system developed, manufactured and supplied by Composite Technologies Corporation (CTC).
The basic components of the THERMOMASS system are 2-in. thick layer of extruded polystyrene insulation installed between two 3-in. thick layers of concrete. These three layers are held together by CTC-manufactured, high-strength, fiber-composite connectors installed on a 16-in. grid.
Thermal conductivities of the panel concrete and extruded polystyrene foam were tested by ORNL BTC Laboratory using hot plate apparatus - ASTM C 518-91. Thermal conductivity of foam at mean temp. 50 deg. F was k a = 0.2 Btu-in./hft 2F. Thermal conductivity of concrete was k a = 9.09 Btu-in./hft 2F.