There are two risers in the bathroom on the 21st floor of the high rise, and the decoration master s

The two pipes in the bathroom will not be both fecal pipes, one is the water pipe, and the other is the fecal pipe.

1.The bathroom pipes on the first floor and the risers on the upper floors should not be put together. >>>More

One sewage and one exhaust, we all know that if there is only a sewage pipe and the pipeline is relatively long, the sewage will cause the internal air closure of the pipeline, which will make the sewage unsmooth, and even make the dirt oppress the air to escape from the nearest floor drain, and the situation of a household leaking odor from the upstairs sewage downstairs will occur. The ventilation pipe and the sewage pipe work separately, and the two pipes converge into one on the first floor. Low-rise buildings generally do not need to be installed, and houses with more than 10 floors need to install a special sewage system. >>>More

Wrapping a soundproof cotton generally won't make a sound.

No, 1, because all the branch pipes have a certain slope, otherwise they can't be drained. 2. The connection between the branch pipe and the riser is an elbow, which basically blocks the backflow of water, 3, the branch pipe also has a water trap at the connection to the sanitary equipment, 4, the diameter of the riser is much larger than the diameter of the branch pipe, so there is generally no such worry. Of course, if there is a blockage in the riser, there will be what you call backfilling. >>>More