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Anonymous users2024-01-24It should be removed along with the cement mortar under the floor tiles, and then re-waterproofed.
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Anonymous users2024-01-23If you want to see if you don't do waterproofing, do a closed water test to know, and if the wall is damaged, you should redo waterproofing.
The first question is to ask for a closed water test when the other party is waterproofing, that is, the ground is full of water, and after 24 hours to see if the ground water is reduced (of course, if the indoor temperature is high, there will be evaporation), and at the same time go downstairs to see if there are traces of water leakage on the corresponding roof downstairs and the roof next door to the corresponding room. If not, write a letter of guarantee. >>>More
If you don't destroy the waterproofing layer, you'll be fine. >>>More
In most cases, there is a leak in the bathroom on the fourth floor, and the waterproofing is not done. In a few cases, more than 5 layers are leaked. Find a property, or ask an insider to look for it layer by layer.
As for how others do waterproofing, you don't have to care, you mainly indicate: if there is a water leak that causes the loss of your home, he will bear it.
You said that the waterproof layer of your home is very good, and the exterior wall of the downstairs bathroom is moldy, you can see from the exterior wall whether the exterior wall you want to even have is moldy! If there is no problem with the exterior wall of your bathroom, then it should be the problem of your own bathroom downstairs (including weather problems), and the mold of the exterior wall may be due to the fact that the waterproof layer of the civil construction is not done!