Is it OK to do this for bathroom waterproofing?

It should be possible! Now why 50% of the waterproof buildings are leaking, one of the points is not to pay attention to the protection of the finished product, even if your waterproof material is good, the construction quality is high, after the finished product protection is not in place, it still leaks. Therefore, during the construction of the waterproof layer and after the construction is completed, we must pay attention to the protection of the finished product, and the situation you said should be more responsible for the construction party.

You can check the construction standards on the Internet!!

It's very comprehensive on the Internet, and it's impossible to say.

Suggested read: "Waterproof Portal" website is: 91fangshui

First do waterproofing and then paving floor tiles first paving floor tiles and then waterproofing may not have leaked at that time, but after a while (after you use it for a period of time) there is a leak downstairs!!

There is no problem at all, the bottom layer is not sticky when sticking wall tiles, and it can be rolled up 30 cm when doing ground waterproofing, in fact, the normal practice should be to do the wall and ground together, and then do the protective layer, you save the process of the protective layer.

Yes, this is done to protect the waterproofing on the ground from being damaged during the construction process, because sometimes the masons cut the tiles on the waterproof layer after the waterproofing is done, and throwing tools can easily lead to the destruction of the waterproof layer, and the waterproof effect cannot be achieved.

Your bathroom waterproofing should be used paint or mortar, basically there is no big problem, because the bottom of the tile on the wall is not pasted first, and so the top is all pasted, and the ground is waterproof, to the wall back to the height and the previous waterproof layer combined, and finally paved the ground and the bottom of the wall around the tiles.