Add a toilet to an existing drain trunk?

tjdabombJuly 22, 2014

Hello!!

Looking for info on adding a toilet on slab construction.

Commercial space, looking to a add a bathroom abreast to two existing bathrooms - left to right, far right being the new bathroom. Existing bathrooms have a water closet and a sink. Got a bid of $9k to add new bathroom because the plumber says we need a dedicated line from our proposed new bathroom to the main. I say BS but I do not know the code, and, I am not sure if the existing toilet trunks are 3" or 4". I have read that ya cannot add a toilet to such an arrangement unless the new toilet is 15' away from the next toilet.

So..... what's the real deal?? Can a toilet be added by just wye-ing into the last toilet?? Can I do that if it is a 4" drain? Can I do it if it is a 3" drain?

Thanks much experts!!!

TJ

Thank you for reporting this comment. Undo
AlwaysPlumbing

We would like to take a look at this, and give you another bid. Do you have plans available via email? Send email to bid@alwaysplumbing.co

Here is a link that might be useful: Our website

    Bookmark   July 24, 2014 at 5:39AM
Thank you for reporting this comment. Undo
tjdabomb

Thanks for the reply!!!

I was more interested in the code that states the regulations for the work that I have highlighted and not a contractor to do the work.

Any thoughts?

    Bookmark   July 24, 2014 at 6:17PM
Thank you for reporting this comment. Undo
tjdabomb

bump

    Bookmark   July 28, 2014 at 4:29PM
Thank you for reporting this comment. Undo
jackfre

Codes vary by State. Your plumber, and apparently you, need to analyze what is in the slab now, overlay the specific code in your area and arrive at the correct decision. Before the code question you have to know the lay-out and size of the existing drain & vent system. I think you call BS rather hastily!

    Bookmark   July 29, 2014 at 12:10PM
Thank you for reporting this comment. Undo
tjdabomb

Yes, I know codes vary by state, but, there is a general rule of thumb or predominant code specification that is used in multiple jurisdictions, that is what I want to know. And as originally asked, if it is a 3" drain, what is the code? If it is a 4" drain, what is the code?

it's like pulling teeth around here sometime.

    Bookmark   July 30, 2014 at 4:45PM
Sign Up to comment
More Discussions
Does reverse osmosis water corrode copper plumbing? The answer ..
The answer is YES. I did a very unscientific study...
ohmmm_gw
New under mount sink - drain off-center?
I had a new granite countertop installed with an under...
mike_lee2
Am I the only one bothered by this?
Since Houzz took over, these forums have become a spam-infested...
aliceinwonderland_id
Inspection Hell (or why not to DIY)
Hi everyone, First time poster but long time lurker....
giantsean
Toilet swirls, but won't flush!!
Very frustrated. The toilet seems to be ok, it gets...
edweather
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™