If your bathroom is small, you can install the bathtub first and then lay out the tiles. In case the room is large, start laying out the tiles from the level of the bath rim.
Which floor is better in the bathroom
The most optimal of them are: ceramic tiles laminate (moisture resistant) floor made of natural or artificial stone
What is better for a bathroom Frame or legs
The frame is a more reliable support for the bath. After installation on the frame, the weight of the bath is distributed over several points, which makes it more stable. When the bottom of the bath is located on a strong frame, and its sides support the legs of the frame, the bowl is motionless, the load is optimally distributed, and any deflections of the body are excluded.
The better to finish around the bath
Silicone sealant.
This is the simplest, and therefore the most popular means of repairing the gap between the bathroom and the wall. Use it if the gap is not more than 1-1.5 cm. Silicone is moisture resistant, so in such a wet place where a seam forms between the bathroom and the wall, it can be safely used.
Why should the bathroom floor be lower
The set of current building codes states that the level of the floor in the bathroom should be 1.5–2 cm lower than in the adjacent room, or the floors between them should be divided by a threshold. The requirement is not accidental, but justified by the fact that during a leak, water does not immediately spread throughout the apartment, but accumulates within the bathroom.