When comparing open-cell foam to closed-cell one, it should be mentioned that the first one has a significantly lower density and thus is lighter for the structure of the building. It has a higher thermal conductivity coefficient (λ) and is well water-vapor permeable. Hence, after the use of open-cell foam the building “breathes”. At the same time, such insulation has very good sound-absorbing (acoustic) properties. This makes it an ideal material for the insulation of attic, ceilings and walls, especially in residential buildings.