Cellular Concrete Insulation for Pipes to Prevent Freezing Often, due to conflicts with other utilities or shallow groundwater, water and sewer pipes cannot be placed below the design frost penetration depth. CEMATRIX Cellular Concrete (CCC) is commonly used to insulate these pipes to prevent freezing. The CCC can be cast-in-place in a variety of configurations to meet the specific needs of the project, and there is no need for sand bedding to protect the insulation.