In the sunken bathroom, is it better to backfill the sink with ceramsite or to do overhead?

Do two times of waterproof coating, these two times of waterproofing must be done together with the wall, and the height of the wall should be more than 40 cm higher than the upper edge of the caisson. Ensure that the seepage water in the upper layer will not expand to the periphery, and can only be discharged to the floor drain. Red brick or concrete is used as a partition overhead, and the caisson is divided into several 400*400 lattices.

Many people don't do this step, in fact, this is a very important step, with such a load-bearing partition, the concrete layer above will not fall. Otherwise, after a few years, the bathroom floor will sink, crack and leak. Fill with ceramsite or coal ash slag.

Fill the anti-tide cereal and lattice, do not press too tightly, naturally, because it is not load-bearing, only plays the role of absorbing water vapor. cloth rebar. A layer of 200mm*200mm square steel mesh composed of 5 mm steel bars with a diameter of 5 mm is placed above the lattice to ensure the firmness of the concrete layer and the uniform force.

Inverted concrete layer, 40 mm thickness C25 fine stone concrete leveling. This layer should be done on the lagoon slope, do two times of waterproof coating, even the wall together, after the waterproof layer is dry, it is necessary to brush a plain cement slurry to protect it, so as not to scratch when paving floor tiles and porcelain tiles. After the protective layer is dry, you can go up and do the next step of tile paving. Hope.

Hello, of course, it is backfilled with ceramsite, and it is easy to have problems soon after the use of overhead, and the backfill is solid, and there will be no damage or collapse for decades.