According to TS 825 and German DIN 4108 norms, which are used to increase the heat transfer resistance of adjacent building materials or to minimize the amount of heat escaping, heat insulation material for materials with a thermal conductivity coefficient below 0.060 kcal / mh oC, it is called. Thermal insulation materials can be used in the building elements that make up the walls, roofs and floors of the buildings and in the insulation of the installation systems. Along with these materials, qualified joinery and insulating glass units used in windows are also of great importance in effective thermal insulation. In order to choose the best thermal insulation materials clearly, it is necessary to know the properties of thermal insulation materials.