After the old floor is removed, it is necessary to examine the floor slabs, their safety, the presence of height changes. Apply the zero -level lines on the walls of the apartment, according to which to set the marks of filling the primary layer of the screed. This work facilitates the use of water waterpasis or laser level, the usual bubble level gives a large error. On the marks applied on the walls, at an altitude of about 1.2 — 1.5 cm from the floor level, draw clearly visible lines. They will see what thickness the screed will be, if the thickness of the screed is more than 5 cm, it is necessary to reinforce it with a metal net. In the loggias, it is recommended to heat the floor additionally with a mineral wool with a thickness of 50 mm with an increased density, but before laying it, apply vapor barrier to the stove.
Before filling the black layer of screed, lightaks should be installed, which will help later get a horizontal base on which the final layer will fall. The height of the beacons depends on the planned floor thickness, if it is a porcelain, then this is up to 12-15 mm, taking into account the thickness of the glue layer; Parquet board-18–25 mm taking into account the thickness of 8 mm plywood. The thickness of the second layer of the screed is 20-40 mm, this means that its upper level will be on an average of 30-45 mm below the level of the final surface of the floor so that the black screed does not burst, its thickness should be no thinner than 30 mm if it Made of Portland -cements. Screeds of self -leveling materials are much more expensive.
