Installing a suspended ceiling
To install the main rails that are perpendicular to the ceiling joists, screw 1 1/4" screws every two or three joists. Place them at a distance of 60 cm (24") from the wall and do not screw them in completely. Use these screws and iron wire to suspend the first rail. Use a level to help you tie up the rail to the right height, i.e. same height as the L-shaped mouldings. Repeat this procedure every 60 cm (24"), until all the main rails are installed.