When they take a shower or flush the toilet in the upstairs of the house, they feel a slight drippin

It is recommended to find the property management department or the neighborhood committee to coordinate and solve, if it causes large losses, you can sue the upstairs residents and instruct them to repair the hidden dangers and compensate for the losses.

Find a professional maintenance personnel to make a backwater bend "U" shaped in your sewer, and the problem is solved!

I can't see the situation clearly, but there are many reasons for the blockage, such as the septic tank in the community is full, or the septic tank and sewage pipe in the building where you live are not smooth, and there are some things that are easy to clog into the toilet, and there are also unreasonable design of the sewage pipe in your bathroom (the angle is too large or improper, and the trap is not properly installed) and so on!!

Yes, you need to planing the ground, and you have to find a professional master to install it.

Case-by-case analysis.

For example, leakage at the shared exhaust location on the roof of the building (so that the gas cannot contact people, and is directly discharged into the air to prevent toxic gases such as biogas from entering the room and being harmful to the human body; >>>More