Why is my toilet overflowing?

Whether the upstairs is covered, the exhaust hole of your sewer is blocked, generally the toilet drainage hole is through the roof of the open air, mainly to discharge the biogas in the pipe, but also to reduce the gas pressure when flushing, so that your home will not turn over the water.

When adding floors, it may be easy to do it, and instead of continuing to extend the sewer exhaust pipe upwards on the top floor, it leaks directly.

It is recommended that you go to the top floor to cover the place to see, if the drainage pipe of your toilet is blocked on the top floor, or is occupied by the toilet, pool and other drainage, and does not continue to extend up to the ceiling, there is a problem, the water is still small, and in the future, too much biogas will continue to be discharged in the pipeline, and it is easy to backfire and explode, which is very dangerous. If you can't go up to the top floor, look at a vantage point next to it to see if there is a drain sticking out on the new top floor.

I'll give you an idea, you find a plumber, ask the plumber to repair it in person, if the plumber says there is a problem, then you will have something to say about the property, otherwise just guess who knows if there is a problem.

The property doesn't do practical things, and this kind of unfortunate thing falls on his own head or suffers himself. What do you think?

It's blocked, others are perfunctory to you, we are next to a building too, others upstairs decorated a small brick down, the result is blocked, basically a year his house will be flooded once, the real estate is also said not blocked, and then his family spent their own money to find someone outside to do a good job.

This can be caused by the pressure of the gas, and the water is flowing down when the water is flushed upstairs. Flush the gas to your floor.