Downstairs? First floor with a basement or in the basement? If first floor with access in the basement or crawlspace, no real problem. PVC, just cut the pipe and install a T. Cast iron, you can use a Saddle Clamp made for this. Looks like a PVC T split length wise and held to the cast iron with two U bolts.
If adding a bath in the basement, you will have to bust out the floor, add the drain and replace the cement.
Unclog drain that both sinks drain into.
The drain from the toilet to the main drain is plugged and the branch to the shower is not. If the main floor toilet flushes, it is between the two toilets and not between the house and the sewer.
What makes a bathroom drain smell, soap makes a bathroom drain smell
The different parts of a bathroom sink drain include the drain flange, tailpiece, P-trap, and drain pipe.
A bathroom drain kit typically includes a drain assembly, gaskets, washers, nuts, and sometimes a tailpiece. These components are essential for installing and connecting the drain to the plumbing system in a bathroom sink or bathtub.
Is your shower drain leaking and causing water damage in your bathroom?
Answer The waste line from the downstairs toilet is not vented (or not vented properly, or the vent is plugged up). Flushing the upstairs toilet creates a vacuum in the main line which sucks the water out of the one downstairs. Answer your waste lines for both toilets may be on the same branch off the sewer main. Either you have a stoppage in the branch line or you have a stoppage in the main line. (If it's the main line your downstairs toilet would have to be the lowest fixture, ie If you have a floor drain downstairs and it's a stoppage in your main line it would backup through the floor drain. If there is no floor drain the toilet downstairs is probably your lowest fixture.) Your best bet is to snake out the system through the toilet downstairs.
Because they share a common drain line which is clogged. Gravity and a common drain pipe means the back-up would appear in the downstairs drain, even if it appeared to be cleared in the upstairs drain. Be glad you are not just slightly uphill from the clog. The sink line line needs to be roto rootered from upstairs, through downstairs, through to the common basement drain to clear out the clog.
Pee in the drain or sink! n00b
The distance between the toilet drain and the wall in a typical bathroom is usually around 12 inches.
A toilet drain should typically be located about 12 inches away from the wall in a bathroom.
Yes, the bathroom sink drain pipe may be leaking at the connection point.