FIBRAN xps is extruded polystyrene certified for use in thermal insulation and insulation of external walls (thermal facade). Depending on the application, there is the corresponding type of extruded polystyrene FIBRANxps (for thermal facade, for thermal insulation of rooms and floors, for thermal insulation of masonry). breathable insulating. Its characteristic advantages are its high mechanical resistance to compression and tension, while it is also waterproof, non-hygroscopic, light and easy to use.