We do not

First, a metal frame for the first level is attached directly to the ceiling itself. To do this, use two profiles with UD and CD marking. The frame of the first level is offended by drywall sheets only in the middle, t. e. We do not sheathe the places where the frame for the second level will be installed. After lining the first level, the installation of a metal frame for the second level is carried out around the perimeter of the ceiling. Then sheets of drywall are installed on the frame, simultaneously cutting off holes for lighting devices and installed lighting devices themselves.