Should the bathroom be leveled with concrete to make a waterproof floor? That is, scraping?

Both coating waterproofing and coiled material waterproofing should be leveled at the grass-roots level, otherwise the construction is inconvenient, indicating that potholes can't make the coiled material completely close to the ground, there will be gaps at the summer-planting place, and potholes will sink and crack after loading, and bulging or granular positions will destroy waterproofing; Secondly, waste of materials. If the surface is uneven or rough, waterproof coating should first fill the gap between tiny particles and then cover it completely. If the base is uneven or uneven, it can be leveled with cement slurry (cement and water). Pay attention to the internal angle of 2-3 cm, and the external angle of the grassroots should be painted, that is, the grassroots can't see the edges and corners.