Before starting work, it is necessary to mark on the walls to install the mounting profile. In the case when clips are used and the ceiling is uneven, the clips are fixed on the walls. First, the lower point of the future ceiling is noted — the gap between the stretch ceiling and the main should be at least 50 mm. Using the level, a line is drawn along the walls along which the installation profile will pass. The capital ceiling is prepared — it is cleaned of paint and plaster.