connecting shower and toilet drain

[jhaug]

I am busting up some concrete to move a toilet drain, and was wandering if, while I have the concrete out, I can tie into the toilet drain line with a shower drain. This would make life a bit better, as it would keep me from having to bust up alot of concrete and changing out the main stack. thanks

 

[Krow]

Yes you can, provided you vent the toilet first and connect your shower downstream of that vent.

So you will see, toilet flange, toilet vent and last shower drain

 

[Sponsor]

 

[jhaug]

the toilet vents thru the main stack, so I am guessing that the new shower drain will also have to go into the main stack.

 

[hj]

vent

Bad guess. Unless you have an unusual setup, the toilet will NOT, or at least SHOULD NOT, be vented through the main stack, because it will be a WASTE stack, not a VENT stack. And you have to vent the shower individually from the toilet. Just because something is installed "near" a pipe does not mean that it is vented, nor vented properly, nor vented effectively.