The toilet is attached with screws to a wooden board or shield called taffeta. This shield is monolithic with the device for preparation under the floors. Then they lay the sheet rubber and screw the toilet. Wooden taffeta can be replaced with metal with welded bolts. Screws and taffeta are subsequently hidden under tiled floors.
Bathtubs are installed on metal legs. The distance from the bottom of the drain hole to the floor must be at least 145 mm. The bias is done towards the release. The length of the bathroom should be at least 1700 mm.
Well, with the engineering features of the "big repair" figured out. We turn to the finish