Polisterol is a isolating material. This is a very economic producton in the diversity of thermal isolation and diminishes the usage of energie.
"Euroterm" thermoisolating materials from EPS(polisterol) have been traded this last 40 years as a material for making roofs, walls, floors.
The three reasons for using Euroterm EPS(polisterol):
To reduce your expenses for heating in a minimum, a total thermal isolation is needed for your house. If you use Euroterm EPS, it will save the environment(by diminishing the amount if CO2, NOX,,SO2)
All of Euroterm materials are from air(98%). They don't irritate the skin.