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It's normal, which is not like this, if you don't want to have worries, you can only wet pave the floor tiles, before putting the sill board, you must do the water retaining strip and the bathroom floor is level, do waterproof, and finally put the sill board with wet ash
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It is not normal and needs to be drained twice.
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If it is not normal, it needs to be darkly arranged.
The tide is already a serious leak, and if there is no large amount of water and it will be wet, it must be a serious leak. Go and check the water and sewer pipes.
As long as there is no leakage, the mortar layer under the floor tile is damp and there is water, this is a dry reed, don't deal with it, your floor tile seam is not good to do waterproof, there is no such material, (there is also a lie to you).
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My bathroom in the waterproof layer of the leather floor tiles under the seepage, seeping into the downstairs living room, the bathroom is all demolished, redone to drain water and decorate the floor tiles, downstairs living room water seepage repainted.