Naturally - the ecological covering of a roof serves more than 100 years. A recommended inclination for naturally - an ecological covering of 35 degrees. The biggest lack its{his} this natural origin - a natural material not cheap, and stacking difficult enough, specific knowledge are necessary. Heavy enough, therefore it is impossible to stack this material on any buildings. It is necessary to mean, that service life short enough, the ego can be prolonged processing a material chemicals, but will suffer natural roofs.