In general speaking, gases are very poor conductors of the heat flow and that is why they are so good as thermal insulators.
Thanks to the open porosity, glass wool products allow air to be entrapped within its pores, reaching a thermal conductivity approaching that of the gases. Common insulation materials with a proper pore size rely on the principle of trapping air to reduce convective and conductive heat transfer what depends on:
In the case of XPS (extruded polystyrene), highest thermal insulating character is given by the facts of its closed cell structure and advanced URSA production process technology.
Then, insulation is needed to provide resistance to heat flow keeping the indoor space of the building at a stable and comfortable temperature what will drastically reduce the heating and cooling costs.
The resistance to heat flow or also thermal resistance is the result of a combination of the thermal conductivity of the insulation material and its thickness. Thermal conductivity is a characteristic of the material which varies according to the raw material, production process or porosity orientation but never depend on the density of the material; increasing the material quantity would be just a negative impact on the environment.
To maintain comfort, the heat lost in the winter must be replaced by your heating system and the heat gained in the summer must be removed by your cooling system. Insulating properly along the envelope of the building will decrease this heat flow by providing an effective resistance to the flow of heat.It has to be taken into account that this is only possible by a proper installation of the insulation material that avoids thermal bridges.
A thermal bridge is created when materials that are poor insulators come in contact (ie. external air, brick wall and concrete), allowing heat to flow through the path created and increasing significantly heat losses. Thermal bridges can be easily eliminated including an additional insulating component, thus creating a thermal break.
URSA glass wool and XPS products create the optimum preconditions for a pleasant indoor thermal comfort and energy efficiency. The excellent insulation properties store heat where it’s needed.