Generally, we know the materials ourselves, and then choose the good ones to solve the water leakage problem. According to the current domestic market situation, I will give you some pertinent suggestions.

Everyone knows to use asphalt, but this thing is harmful to human body and belongs to carcinogen.

There are also many people who use black trapping materials to trap loopholes like this, depending on who your luck meets.

Baked with fire like this, it leaked again in a few years. The fundamental reason is that thermal expansion and cold contraction are at work.

As long as the floor is found to have leakage cracks, it can be repaired directly with flashing. It is the best material in China at present, and it will not leak for ten years.