Gender insulation in modern construction is an integral part when designing a house. Thanks to the insulation of the floor of such an important part and the most contacted with people in this house. They win in two directions once, significantly increase comfort and reduce heating costs. From the great variety of proposed insulation materials, it is necessary to take into account certain characteristics, which must correspond to the full return of the required conditions. The material should be well fitted, have a high cost. Thermal conductivity should be low when compressed, have high strength at mechanical loads. The most common two material today is mineral wool and polystyrene foam. Consider each individually and analyze our advantages.