First, the marking is drawn on the wall: we put the level to the wall and carefully knocking down the drawing line for the supporting profile around the entire perimeter of the walls. Then, already on the ceiling at a distance of B40 centimeter from a friend, we draw lines for the main profile. Then, on the lines of the main profile, at a distance equal to half a meter, marks are made in the form of crosses for fastening fasteners.
