I am combining what used to be side by side bathroom and laundry rooms in my basement into one larger room and of course this necessitates moving plumbing.
The previous plumbing all seemed to be draining just fine.
Please see the attached photos for a reference:
My main areas of concern are as follows:
The existing dry vent that I am tying into is 2". I presume given teh fact that there were no past problems that this is sufficient for this bath/laundry group
Given that the shower is now downstream from the toilet will this be an issue with venting? They will both use the sink's wet vent
Do all of my tie ins to the main horizontal line (shower, toilet, sink) need to be Y-shaped?
As you can see the two vents will tie in at the ceiling below the joists. Is the way I have it drawn out OK? Ideally I would run the line straight to both areas but you can see some stuff gets in the way so I have to make that awkward shape. This vent ties into the stack that vents the kitchen. The kitchen sink does not drain through this stack.
Please let me know if anything is unclear about my drawings.
In my neck of the woods, very little of the either piping layouts would pass code.
The shower,lav and toilet are not vented per UPC standards.
The only thing I see plumbed properly is the washer-it's vented
And yes you must use wyes on horizontal drain connections
Up here wet venting is done quite often. The problem draining the shower before the toilet, is that if there's a back-up on that horizontal line, you could have sh*t back-up into your shower.
Give us a location so we can get an idea of which code you're under.
Up here wet venting is done quite often. The problem draining the shower before the toilet, is that if there's a back-up on that horizontal line, you could have sh*t back-up into your shower.
So I Photoshopped up some shots to further clarify things, and also illustrate tying into the 4" main AFTER the bath group.
Is there a minimum distance to maintain between tying the laundry into the main drain and the wye for the shower?
What is wrong with my proposed 2" lav drain? Could you clarify? I plan to tie it in to the main drain via a wye. It will of course be trapped. It will also serve as a wet vent for the shower and toilet.
The upstairs kitchen/dishwasher have their own vent and the washing machine would have its own vent leading to the main bathroom vent.
Id try to keep the washer tied in atleast 5' ahead of any other fixture to avoid issues with soap suds,then run a full 2" vent from it.
Why do you have a 2" vent drawn for sink?
What if you were to use a side inlet closet 90 on the toilet to drainn sink into,then just wet vent toilet through the sink.
Then just bring seperate vent up from shower where ever it lands and tie it in above someplace with sink vent.
The reason Id keep the tub tie in ahead of other fixtures is to keep soap suds from backing up into other fixtures when it dumps water out.
This drainage stuff really has been probably the trickiest thing I've done in my renovations history!!
I of course had to Google what a 'side inlet closet 90' even was!
So that being said, I looked it up and I think you're proposing that instead of a wye to tie the wc into the 3" line, I use that 'side inlet closet 90'.
If I'm understanding you correctly then I'm not quite sure what the benefit would be. Could you possibly clarify?
I can't say it enough, your help is greatly appreciated!
This is the only picture I could find without digging through my van,the wc version would actually be 4" on top and 3" on bottem with the side inlet.
Anyway it would allow you to wet vent the toilet through the sink vent,and it would move the san tee for sink inlet farther from where the washer dumps in to help with the suds issue.
Just trying to solve as many issues as possible in your limited area,shower drai could still be a problem though :wink:
It should be ahead of the other drains not behind since the suds still have to pass them.
5' ahead of shower drain would be perfect,just depends on how picky your local inspectors are.
I'm using a Schluter preformed base, so I can't really play with the drain location in the shower.
That being said, what if I were to drain the shower to the left (at the proper slope of course) and have it make a u-turn back into the 4" main drain approximately where the lav/vent ties in. That way I can tie in the washer as far to the right as possible (will break more slab to increase distance if needed).
Is this 'u-turn' allowed? Also, the drain for the washer seems to run for a long time horizontally on the slab. I think I would need to revent it.
More offsets add up to more possible clogs down the road,yes run a 2" vent straight up from san tee where the trap for washer box ties in .
did washer have a seperate vent tied into stack before or was it tied in with bathroom venting?
It was tied into bathroom venting... given what I saw when I tore apart the walls this was a very amateur job. Strangely though, the drainage worked well. Washer was behind tub and toilet and the old sink trap emptied into the trap of the washing machine (so it wasn't vented).
Only issue (that I see) is shower vent now, gotta check distance
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