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We will use the roof of trickered, since it has its advantages, for example, that snow does not accumulate on it in winter, also in this type of roof there is a lot of internal space, which will significantly increase the second floor. Under the overhangs of the roof you can make additional lighting. As a finish material, you can apply the tile throat, it is relatively inexpensive, just lay it. As insulation, you can apply the rolling system of insover insulation system.