If the slab is already cast, it is necessary to add to the latter a minimum thickness of screed 4 cm to be smoothed using the scraper blade fitted to the swing bridge, important not to forget to disengage the drive gear motor (wedge to remove) and by manually rotating the bridge. At the end we will have to clean the wiper blade rubber.
· The floor must be rough to receive the screed that will be composed of a hydraulic fast-setting concrete.
Some civil subcontractors use vibrating rulers to make this screed