For our people, in the broadest sense of the word, until a certain time, there were no such concepts as a mansard or, even more so, a flat utilized roof. For us, the concepts of an attic and a roof of a house were more familiar. An attic, of course, is for all kinds of household junk that you have nowhere to store in the rooms. And the roof of the house… Well, that's just it - the roof of the house, and nothing more. In Europe, flat roofs of houses have long been used to create recreational areas (cafes, restaurants, pools), tennis courts, car parks, even gardens and greenhouses. And today, in big cities, you can see elite residential complexes, and even private houses with flat utilized roofs. The best way to waterproof a flat utilized roof is with polyurethane.