Lighthouses are usually strengthened with cement mortar and allow to dry a little. When the beacons strengthened well, you can fill in a concrete screed. For concrete screed, the cement of the brand 400 is usually used. The preparation of the screed solution itself goes, thus, a proportion is used 1: 4: four gravel shovels, four sand shovels and one cement shovel, such a screed will be very strong. The solution is kneaded in a concrete mixer and poured the floor with it. At the same time, the solution is leveled with the rule.