Problems with overflow holes in the bathroom

You should have a plumber do a pressure test with a pressure test pump, because this pressure test can know if there is a leak in the water pipe.

In addition, when sticking to the floor tiles, if the dry paste method is used for construction, then if there is water on the surface of the floor tiles, the water can penetrate down, and at this time, it is useful to open an overflow port on the side of the floor drain. However, if the slope of the original ground is not inclined in the direction of the floor drain, the water that seeps down will still remain under the floor tiles.

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According to the situation you said, the water pipe is leaking, and it has nothing to do with waterproofing, you need to find the leakage point of the pipe and re-weld it.

Leave an overflow hole on the top of the waterproof layer to prevent water from seeping into the waterproof layer and flowing to the drain mouth, provided that the waterproof layer is made into the shape of the bottom of the pot. This is a backup, not a necessity.

Experienced, responsible bricklayer in the patch of floor tiles, is to the back of the brick with plain ash is also with waterproofing agent modulation, so that in use, the ground sewage will flow to the floor drain on the surface of the floor tile, and will not seep into the mortar layer of the floor tile, so that it will be dry forever, otherwise, after many years the bathroom has the possibility of peculiar smell.

As a result, the outer wall surface was damp and peeled, indicating that the façade of the waterproof layer was not done well and did not form a box-shaped waterproof.

There are two possibilities, 1 The float is adjusted high, and the water level is higher than the overflow hole, resulting in the float switch not having enough pressure to close tightly.

2. The float switch is broken (generally the pad inside is broken).