View Full Version : Would be thankfull for some advice...waste stack ques.

07-01-2010, 11:03 PM
Hi Guys, first hav to say really like the site, its great...
Heres my problem, I am adding small powder room and need advice on connecting to main stack.
Layout is done, everything vented and proper pipe sizes,,, just want opinions on best way to connect to main stack. I got my diamond torch blades ready for cutting but I am not sure if a wye or tee fitting would work best? And how to drop down the last 3' within a 4' span?
I am going to hopefully include a rough drawing with this post ( I'm new so I hope I can do it)...

New York State Code (http://www2.iccsafe.org/states/new_york/NY_Plumbing/plumbing_frameset.htm)

Wally Hays
07-02-2010, 05:39 AM
a sanitary Tee is always the preferred fitting for joining to a vertical stack.

07-02-2010, 07:17 AM
WHO said the new piping is correct? If this is a vertical stack, then a "Y" with the branch rising up to a 45 which then levels the pipe out to meet your connection.

Wally Hays
07-02-2010, 07:46 AM
Good point but I have no clue what is above or what the new piping will look like.

07-02-2010, 08:57 AM
Thanks for reply guys... I am thankfull for your advice... sorry for confusion, I thought showing the joists would show it is a vertical stack, other info I should include is that I am only adding toilet, sink was existing... I was able to place wye within 4' of toilet drain for 2" vent that goes to attic and connects to existing vent ( I made sure to roll wye and go 45 vertical into wall as not to hav flat vent as u guys always advise against) so really my question is just about connecting 3" to 4" cast iron vertical stack. Is this new pic. what u guys mean? I used 45 elbows (2) to drop below joist because someone said it is better flow. I am just trying to get plan...hoping u guys can advise me on whats best and correct...thanks again.

07-02-2010, 06:11 PM
Where is your vent line coming off that 3" waste before 4" stack ?

07-02-2010, 06:29 PM
IT looks like it will work, although if I were doing it, I would have used a 45 and a 60 degree fitting to make a "rolling 45 angle rather than two 45s and a 90 combination.

07-02-2010, 08:01 PM
Thanks HJ.. I will do it like u suggest...I trust your advice is the better way

To answer Mac, my vent is about 3' from flange, I rolled wye coming 45 up to wall then straight up to attic connecting with existing roof vent.

07-02-2010, 08:12 PM
Again thanks for the comments...really do want as much advice as you guys can give, this is all theory right now as I havent glued anything, just dry fit... so more advice is welcome