With any construction or repair of the house, not small financial costs are leaving, while the miscalculations and errors of builders and architects are not acceptable. Modern construction companies pay great attention to the calculation of loads on the supporting structures of buildings when re -equipping or building attorne floors located under the roof itself. They have to select the sizes of windows, stairs for the equipment of such floors. At the same time, the quality and models of the attic are very important, since they are often located in the roof itself, and their design is significantly different from ordinary windows.