The picture below shows the installation method of the OSB floor under-layer with definite sizes and fastening types. The polished OSB under-layer with a thickness not of less than 6 mm is suitable for the installation of different finishing coatings, in particular, felt, synthetic and carpet coatings, embossed elastic coatings, stuck on the perimeter or the free-laying elastic coatings. For the ceramic tiles, plotted to the glue, the panels of the under layer must be not less than 11mm thickness, if the distance between the supports exceeds 300mm. Before installing the under-layer make careful dry cleaning of the floor. Sink all coming out nails and fasten them again on the loosely fixed panels. In case of installation above the panel flooring the paving of under layer is to be made before floor finishing. In case of installation above the timber covering, with the boards, packed across the girders, the panels of the under-layer should be fixed in parallel to girders. The under-layer panels are to plot in any direction, if the flooring boards are fixed at the angle of less than 750 to the girders. For fastening of the under-layer the nails or brackets you should start from the angle of panel, in the diagonal direction. One should ascertain that with the installation of fastenings the panels fit flooring. Nails are driven at the center-to-center distances of 100mm on the edges and of 200mm on the middle of panel. Brackets are fastened at the center-to-center distances of 75mm on the edges of panel and 150mm in the basic places. Use the glue only on the soluble basis.