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Old 03-08-2010, 06:55 PM   #1
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Bathroom DWV Layout Problems


I am redoing a bathroom including changing the layout - and at the same time replacing all of the copper DWV that is 50 years old and corroding (with PVC). Additionally the adjacent bathroom has layout issues with a toilet that is not vented before the shower ties in, and as such the shower trap gurgles (ALMOST siphoning). I want to correct this while it is all torn up.
 
The existing bathroom is a standard 5x8 layout with tub along back wall (left drain) and toilet in the middle of the left wall and lavatory on the end of the left wall.
The new layout is as shown below.

The excess room is being taken from a linen closet and underutilized master closet.
The bump out being the vanity/sink is for the flue vent and return air plenum (which i will rebuild).
 

Above is an image of where the new bump out will go, framed with 1 5/8 steel stud due to proximity to the Type B flue pipe.

Above shows where the new closet bend and flange will need to reside. Shown is a heel inlet elbow which I will ask about later (one of my primary concerns).

Above shows the location of where the new shower trap will need to reside, as well as the main vent stack on the left and the horizontal drain/vent that runs down to the main drain on the right (not shown).

Above shows the horizontal drain/vent turning downward and the 2" vent for the adjacent bathroom. This is also where the toilet and shower from the adjacent bathroom tie in incorrectly.

Above shows the location that the new bath trap will need to reside. Directly behind this is where the adjacent bathroom's toilet is.
Above shows an overall shot of the room.
 
 
 
 
 
 
Now for the questions:
I had a master plumber over today for about 90 minutes trying to figure out a new layout. He is a pretty good plumber as far as I know and I felt good when he left - but then I started thinking about it and the layout we came up with has both the new toilet AND the new shower venting horizontally below the floor. I will call him back tomorrow but for now I am looking for other opinions. Below is an isometric drawing showing the layout we came up with for the new bathroom as well as fixing the old adjacent bathroom. The biggest concern I have is the toilet beingvented using a heel outlet elbow below the floor, and the shower being vented from a tee/wye below the floor. We went through so many layouts today I got confused on the rules and didnt think of that when the plumber was here. Like I said I'll call him back tomorrow about this.

for now - I am looking for any suggestions you may have even if it is a completely different layout. Thanks

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Old 03-08-2010, 08:49 PM   #2
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Bathroom DWV Layout Problems


im confused... do you have to walk through the shower to get in the tub?

Does anyone know if there's a code prohibiting this?

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Old 03-08-2010, 08:57 PM   #3
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Bathroom DWV Layout Problems


Yeah, and as far as horizontal venting, it doesn't fly around here, unless you have an absolute no-go structurally, and then you have to use all drainage fittings.
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Old 03-08-2010, 08:58 PM   #4
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Bathroom DWV Layout Problems


And, the heel outlet 90 on its back using the heel outlet for a vent horizontally... huge no-no, as far as I know the vent ALWAYS comes off the top in any code book.

It looks to me that you're doing a bunch of work on the 2nd floor that you don't really have the space to do without having access to the walls below. The way that drawing is layed out doesn't really look kosher to me, but feel free to wait for other responses.
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Old 03-09-2010, 07:04 AM   #5
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Bathroom DWV Layout Problems


Quote:
Originally Posted by Alan View Post
And, the heel outlet 90 on its back using the heel outlet for a vent horizontally... huge no-no, as far as I know the vent ALWAYS comes off the top in any code book.

It looks to me that you're doing a bunch of work on the 2nd floor that you don't really have the space to do without having access to the walls below. The way that drawing is layed out doesn't really look kosher to me, but feel free to wait for other responses.
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Old 05-14-2011, 11:15 AM   #6
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Bathroom DWV Layout Problems


you need a vent for the shower at the bottom right. instead of using the heel outlet ell on the toilet on the left, use a side outlet ell and pick up the lav off of that for your vent and the kitchen would be by itself on the arm instead of tying the lav into that. venting on the horizontal under the floor is ok if you roll the t up to at least a 45 degree angle.
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Old 05-14-2011, 09:02 PM   #7
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Bathroom DWV Layout Problems


lol, thanks Danny - but I finished that bathroom last year - this is a really old thread.

I ended up doing it differently than the drawing. Actually - i did it exactly as you suggest with the lav wet venting the toilet into a wye turned upwards(ish). I also added a vent for the other shower that is not in the diagram.

Here is the finished main bathroom:


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Old 05-14-2011, 09:22 PM   #8
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Bathroom DWV Layout Problems


Looks nice. I esp. like the coffered ceilings.
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Old 05-15-2011, 09:00 AM   #9
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thanks. here are a few construction pics:

Coffered Ceiling





Kerdi Waterproofing (ALOT of it!) This tub within the shower layout is awesome and incredibly convenient/space-saving - but it posed a unique waerproofing challenge that could really only be done with a surface applied membrane like Kerdi or Hydroban. In retrospect I shouldve used Hydroban. Liquid would have been MUCH easier.





Tiling in progress:


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