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Holes are drilled for exhaust gases.
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It is used for pumping units or water heaters, or both.
The problem of the waterproof layer is certain, otherwise it will not leak downstairs. >>>More
Before doing waterproofing, (generally there are pre-existing holes, if there are no pre-existing holes, then make holes before doing waterproofing).
Bathroom brushing is a wall treatment to prevent wall problems caused by moisture resurgence. >>>More
There are no special regulations for this pipe, and it is all industry customs. Although they are all PPR water pipes now, don't forget that they used to be metal water pipes (although they do now). >>>More
It is a relatively trendy decoration style at present, and the two basins can be used by the husband and wife at the same time to enhance the emotional exchange between the husband and wife.