The next stage of finishing the ceiling with drywall is to attach to the walls of the UD profile along the marked perimeter with a step of 50 cm, after which the marking is performed under the guides. Distaners or suspension fixed along these lines must be arranged in a checkerboard pattern. After that, the profile itself is installed using threads or ropes stretched between opposite walls — this will help to achieve the correct horizontal position. Now you need to attach the profile to the distances and insert it into the perimeter near the walls. At the joints of the perimeter, connectors from the CD profile are used, they are fixed with self-tapping screws. The final procedure for collecting metal structures is to check the strength of all connections and laying existing communications. Now you can start directly to the installation of drywall sheets.