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It is normal for multi-storey residential bathrooms to have no ventilation pipes, and high-rise residential buildings must have them, according to the water supply and drainage construction drawings.
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If not, there are generally water pipes and toilet pipes.
The air outlets on each floor of the building are reserved to communicate with each other, leading to the roof.
Just checked the old version of the spec, sorry. There is indeed no mandatory provision, according to the "Residential Design Code" GB 50096-1999 (2003 Edition). >>>More
The smell of the bathroom is related to the roof exhaust pipes. >>>More
It's for emitting odors, and it's best not to cut them, otherwise all the odors won't be discharged, and you'll just wait to be uncomfortable.
Make up the waterproof layer, add a layer of waterproof membrane and roll up 200, the waterproof mortar effect is relatively poor, and paint a layer of waterproof mortar on the wall. Generally, when the mid-range or above residential area is decorated, the waterproofing will be done again.