Of the sheet

When everything is decided, you can begin to mark the ceiling from drywall with your own hands, and cut dry cardboard sheets. For markings, as a rule, a metal ruler is used, and a pencil (if you need a line in full sheet, you can use a level or a metal profile). After the marking of the sheet is carried out, it should be drawn several times along this line with an effort to form a groove, and then putting a sheet of the cut line on the edge of the table, press evenly. Since the upper part of the sheet has an incision that has disconnected the cardboard coating, and also slightly damaged the gypsum layer itself, the sheet is completely broken into two parts, but it is worth considering that on the other hand there is also a cardboard that needs to be cut after the fracture and not let it not let it go disconnect from gypsum (do not pull, and do not tear).