What is a multi-shell roof

Several cladding roofs are a roof structure that separates the protected indoor environment from the outside of several roof cladding, which are separated by air layers. Each casing is a precisely defined function and the closer the mark is determined by the number of cladding and other characteristics. The top layer has a protective and waterproofing function, the inner layer is heat-insulating. This type of roof is used on large public and utility buildings.