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Do-it-yourself rafter system of the roof of the extension. For the device of the rafter system I used a board 200x50 mm. The board was pre-treated with an antiseptic. All wooden elements were fastened together using perforated corners and fasteners, as well as galvanized screws and screws for wood. Elements that were in contact with the walls were sealed with foamed polyethylene. The connection of the rafters of the extension to the house was carried out through a board fixed to the wall. The roof slope will be 14 °.