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The mansard roof is the same attic, only more spacious and well-maintained. The choice of its shape and design must be done at the design stage of the house. Thus, you will avoid troubles associated with the implementation of complex calculations and loads, the coefficient of resistance to heat loss and the wind, and other architectural and engineering “problems”.
Choosing a model project or ordering its development from professional designers, you will receive a complete solution with a full set of drawings, an explanatory note, process maps, and even estimates for the building and roofing materials you chose. Having such documentation in hand you can easily understand what, when and in what order you need to do. It remains only to go to the nearest construction hypermarket and buy everything you need.