plumbing
I had to remove the full toilet in our downstairs bathroom to replace the wax ring and flange. Unfortunately I had something come up and was unable to finish the job tonight.
I did put some shop towels in the hole so nothing fell down the pipe until I can finish the job after work tomorrow.
But in the mean time, are we able to use the upstairs bathroom and flush the toilet without it causing any issue with the downstairs one?
The house is almost 100 years old so plumbing might be wacky.
The flange should sit on top of the finished floor, if it doesn't you'll have to modify the plumbing or find another way to achieve this.
Notice in this image how the toilet waste pipe sits just inside the flange opening, this is the proper way for a toilet to sit on a flange. Even without a wax ring, this union is not likely to leak under normal circumstances (I'm not recommending a wax ring not be used).
Some folks recommend using a thicker wax ring, or even doubling up wax rings. The problem with this, is that you end up with a waste pipe made from wax. Now this might hold up, but more than likely it's eventually going to fail, and leak.
If you have access to the flange from below, you might be able to modify the plumbing to make the flange sit atop the floor. In most cases, however, this is not an option.
There are adapters available, that solve this exact problem. The Set-Rite Toilet Flange Extender Kit; described in the answers to this question, Comes with different size spacers, which allows it to compensate for various sized offsets.
Its a venting problem. Without enough volume of air to replace the volume of water moving down the pipe a suction is created. This is due to sizing or placement problems. Get a new plumber, a licensed one if your state upholds that standard. The license would separate those who say they are a plumber from those that are plumbers.
Best Answer
Unless you are having other problems (e.g., sewage blockage), this should not cause a problem at all.