Measuring the surface of the ceiling surface

In order for the surface of the ceiling to be even and to clarify the layer, which must be applied to the surface of the ceiling. In order to measure the surfaces of the ceiling, it is necessary to attract several people, in order to obtain the most accurate result. It can be people who carry out construction. One person applies the level to the wall under the surface of the ceiling and makes a mark of the desired level. The task of the second person, using a special flask, make marks the established level around the entire perimeter of the ceiling surface. The connection of the marks is made using a long ruler.