The main objective of a dandy-roll or dry mix for a floor coupler - work as economic structure for elimination of essential roughnesses of a surface of a floor and formation of the main bearing layer. Dandy-rolls for a floor do not possess full-fledged properties of self-alignment. For this reason alignment or repair of a surface of a floor with their help is always made on beacons. It increases time expenditure a little, but, considering with what roughnesses even in new houses it is necessary to deal, it is more expedient to begin alignment of considerable height differences of a floor with a dandy-roll. Besides the prices of dandy-rolls significantly differs from the prices of jellied floors. Even if thickness of filling of a finishing floor allows to level considerable roughnesses (as, for example, IVSIL TIE-ROD-III), considering lower price of a dandy-roll or coupler, economy of cost of process speaks well for their application. However, the choice of material for alignment of a floor in this case always remains for you!
About a finishing covering of a coupler or a dandy-roll. In view of the fact that dandy-rolls of a floor provide first of all the main, rough alignment of a surface, as a finishing covering for them the tile is most often recommended. First, because the exact horizontal level of the leveled surface in this case directly depends on skill of the expert performing works and from that how precisely on the horizon beacons were exposed. Secondly, because these mixes for a floor in itself are not finishing and do not provide ideally smooth surface. In the third how the dandy-roll or a coupler was good, at a thick layer there will be the minimum shrinkage that not in the best way will affect a further covering. All these shortcomings are urged to level (in literal sense) the self-leveled or finishing floors.