Method of ballasting roof covering layers on substantially flat roof surfaces

摘要

To prevent the roof covering layer(s) of a substantially flat roof from being blown up in stormy conditions a mortar is put thereon, which comprises a granulated mineral wool, a hydraulic binder and water. Preferably the roof surface to be ballasted is divided-by placing joint elements thereon-into panels. Advantageously rockwool waste originating from the horticulture and glass fibre wool waste may be used as the mineral wool component.