Wall, as a weather resistance provides a protection to prevent outside temperature affects the room temperature directly. However, the insulation of heat on different types of materials are different. In addition, the thickness effects on how many percent heat energy is transferred into the room and affects the room temperature. Thermal resistance is a variable value that measures the ability of a material to block heat rather than radiate it. PolyCRETE is a solution for this as heat insulator. The product can be used in all buildings as plastering material. It is also suitable to be used for sand brick wall as it can reduce heat flow. It also reduces almost 30% of cement usage in plastering walls as shown in figure. Rate of the heat flows into the wall sample was reduced by the polystyrene for both clay brick wall and sand brick wall by max 3 oC.