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shower planning

Posted: Fri Jun 01, 2018 2:42 pm
by greg1
Just wondering if there any good tutorial on installing curb less shower from scratch in basement over slab? Any advice you'd give beforehand? thank you

Re: shower planning

Posted: Fri Jun 01, 2018 4:37 pm
by Shannon
That is something I have not done but hopefully one of the others has.

Re: shower planning

Posted: Mon Jun 04, 2018 6:57 pm
by greg1
Hi Shannon,
I have a further question. I busted up concrete in the basement and ran two lines. One for shower (left) and the other one for toilet (right). I have a slope of about .25" - .5" per foot. But I dont know how to connect the vent pipes? There is no room to tie in the venting. is it possible to run a vent line horizontal? Also do i need venting for both toilet and shower, two separate lines?

Thanks for all your help.

Re: shower planning

Posted: Mon Jun 04, 2018 7:15 pm
by Shannon
How far are you from the main stack and what size pipe is the toilet line and that mean line heading to stack?

Re: shower planning

Posted: Mon Jun 04, 2018 7:17 pm
by greg1
Im about 12 foot away from the main stack. The toilet pipe is 3"
And yes the pipe is sloped towards the main stack. from the main pipe to the top of the concrete on the other end I have about 7" of space in difference. I ran the pipe, dry fit but it doesnt really give me any extra room for venting..

Re: shower planning

Posted: Mon Jun 04, 2018 7:48 pm
by Shannon
I'm not a plumber but this is my 2cents.
You should try to keep the drains at 1/4" slope per foot. To much slope lets the liquid flow to fast to keep the solids moving and to little slope slows the liquid speed and the solids settle out to fast.
Now for the venting you for sure need it for the distance you are going. I think you could add a 3"x3"x3" 45 degree TY into that toilet pipe ,turn it up slightly so its not laying flat and run a vent over to the wall and up. This should vent the toilet and the shower. I just can't tell form the picture if you have the depth to do that. looks like your toilet line is pretty high now?
Now what about a sink ? is there one further down the line?

Re: shower planning

Posted: Mon Jun 04, 2018 8:06 pm
by greg1
Thats my problem i think I have that toilet pipe, the edge of it is about 1.5" from the top of the concrete slab. I dont know if there is enough room either.
Im sorry, if i understand it right, do you mean use a 3x3x3 on the end of that sewer pipe and lay it slightly on the angle. One end I would use for venting and the top part I would use for toilet drain? Is that right? Or do you mean add a 3x3x3 befor the end of the toilet line and use 3" for vent?

As for sink I dont have that eitther yet, I was hoping to tie it in to that whole system as well somehow. Right now there is a washing machine line that is running on top of the slab but its not even vented and was making gurgling noises and wasnt even draining properly so I cut the line for now.

Re: shower planning

Posted: Mon Jun 04, 2018 8:08 pm
by greg1
IMG_20180604_200004.jpg
IMG_20180604_200004.jpg (78.26 KiB) Viewed 537 times

Re: shower planning

Posted: Mon Jun 04, 2018 8:50 pm
by Shannon
Ok so forget venting at the toilet leg it is just to close to the top of floor. So then I would go with a 2x2x2 cut into the shower drain line. It won't serve the toilet as well but will still be ok I think. A 3" toilet line can usually go around 5' to 6' before venting.
So ya you want the TY cut into the straight piece of shower pipe between the P trap and where it joins to the toilet. You want to twist that fitting up wards a bit to help prevent goop from back flowing into the vent end and causing any slight blockage. So if it is turned up a little that help prevent that. The vent can then come over and up through the floor into a wall and then into ceiling and away to where ever you need to go to vent.

Re: shower planning

Posted: Mon Jun 04, 2018 9:10 pm
by greg1
I think I understand now. Thank you very much for ideas! I just hope I have enough for the 2" TY now lol
I drew it in. Please correct me if Im wrong there.

Re: shower planning

Posted: Mon Jun 04, 2018 10:15 pm
by greg1
One more thing- by TY do you mean to use WYE?
I know only WYE and Sanitary Tee fittings. It would seem to be more appropriate to use a WYE for venting in this situation as not to allow for any garbage backing up there. right?

Re: shower planning

Posted: Tue Jun 05, 2018 7:00 am
by Shannon
The bottom picture is correct.
Also what you drew on the plumbing picture is correct as well.

Re: shower planning

Posted: Tue Jun 05, 2018 8:55 am
by greg1
Thank you Shannon for all your help.