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Unread 04-21-2019, 07:05 PM   #1
fordperson
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plumbing: adding onto a horizontal toilet drain

Hi everyone,

Been lurking around for quite a while but now it's time to join in.

Currently I am redoing a small shower which had a bathtub and toilet. The tub was the standard 1 1/2 drain and now I would like to convert it to a full 2" if possible.

Running a new 2" pipe all the way to the vertical stack is quite impractical so I am looking on advice on running the 2" drain into the existing 3" toilet pipe.

Here is the mock up picture for reference. I would wye the 3" using a 3-3-2 and use the 2" leg for the shower drain. From my understanding the 2" pipe needs to be vented separately so I would use the previous 1 1/2 vent for that purpose.

Hope I made it clear, thanks a ton again.
Tom
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Unread 04-21-2019, 08:09 PM   #2
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What you've got there is a low heel vent 90 and while it might look like it solves a problem, it's not code compliant. I don't think there's any application where that fitting can be horizontal but I'm a carpenter who plumbs.

Will it work? Dunno. I wouldn't risk it. Imagine a toilet clog backing up into shower...ewwww.


You really need to wye in downstream. Can't you utilize original tub tie in and upsize the sani-tee to 2"?



Added. From the looks of it that doubled joist that's in your way appears to be really butchered. Is there a wall below?

Now I'm confused, you call out a wye in your text, but show something else in your photo. If you could clarify I might be able to help more.
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Unread 04-21-2019, 09:34 PM   #3
fordperson
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yeah... well the toilet thing looked way too convenient but I have not found anybody doing it

There is no wall below and yes the joists are pretty butchered up... original construction. The other bathroom had the same type of damage that had to be repaired, not sure how these houses pass inspection.

I realize the 1.5 isnt code compliant for a shower but in a pinch I was debating utilizing that for the shower draiin. Upgrading the whole run to a 2" means tearing down half of my ceiling downstairs which is a whole separate project.

It's my understanding that 1.5" showers used to be common until recently and mine has a vent right at the drain location(the wall to the right on the picture provided)

any thoughts on doing that?

Thanks for your help,
Tom
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Unread 04-21-2019, 09:54 PM   #4
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Welcome, Tom.

I think you should re-check your local code concerning that shower drain. Best I've been able to determine the 2-inch drain is required only if you have much more water entering your shower than a standard shower head would provide.

Check with your local code compliance office and I think you might find you're OK with what you've got.

My opinion; worth price charged.
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Unread 04-21-2019, 10:07 PM   #5
fordperson
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Thanks CX.

This is in Illinois and the code is somewhat vague.

---
Section 890.690 Shower Receptors and Compartments
a) Shower Installation. All shower compartments, except those built directly on a
slab floor or having receptors constructed of precast stone, terrazzo, concrete,
molded stone, molded fiberglass, or an equally durable material such as cultured
stone or synthetic stone, shall have a lead, copper, ABS, PVC or fiberglass
shower pan. (See Section 890.230 entitled Safe Pans.) All sides of the shower
pan shall turn up at least 2 inches above the finished shower floor level. Precast
molded receptors shall have a minimum ΒΌ inch thick flange. Traps shall be
constructed so that the pan is fastened to the trap at the seepage entrance, making
a water-tight joint between the pan and the trap. Shower receptacle waste outlets
shall be at least 2 inches in diameter and have a removable strainer.
----



I briefly looked through the document for other references but have not found any and the way I read that is the drain has to be 2" and what happens after that is up to you. Am I wrong here?

What is best practice for reducing the drain pipe? reduce right the the drain fitting?

Tom
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Unread 04-22-2019, 07:27 AM   #6
Radas
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I'd post this on terrylove forums too, the plumbers on there might be able to provide you with some additional options that are code compliant.

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Unread 04-26-2019, 12:11 AM   #7
fordperson
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didnt end up getting any hits on terrylove.

However I have decided to bite the bullet and do it the right way, I took all the drywall down and redid the drain using 2" instead of the 1.5"...

Here is one quick question

Can I make the shower drain in this configuration? its not directly over the flow of the water from the shower however it should still allow for proper venting IMO. Any issues with this setup?
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Unread 04-26-2019, 05:48 AM   #8
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How far is the shower vent from the shower drain, Tom?
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Unread 04-26-2019, 12:49 PM   #9
fordperson
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its about 2-3 feet between the ptrap for the shower and the vertical portion of the vent
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Unread 04-27-2019, 02:24 PM   #10
fordperson
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relp, any thoughts on this?
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Unread 04-27-2019, 04:45 PM   #11
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Tom, I'm ignorant on most things plumbing. Besides the Terry Love site, there's this one. Try your luck there, maybe someone can give the right answer.
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Unread 04-27-2019, 07:27 PM   #12
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Tom, Your plumbing configuration looks fine provided you’ve properly sized the lines.

The size of the waste line is a function of the combined gpm rating of all the devices feeding into the drain line per IRC TABLE P3004.1 DRAINAGE FIXTURE UNIT (d.f.u.) VALUES FOR VARIOUS PLUMBING FIXTURES.

The rating of the drain lines is calculated by IRC TABLE P3005.4.1 MAXIMUM FIXTURE UNITS ALLOWED TO BE CONNECTED TO BRANCHES AND STACKS.

For example, a shower is rated at 2 DFU per P3004.1 so a 1.5” waste line rated at 3 DFU per P3005.4.1 will meet code.

The minimum size for a Toilet per P3005.4.1 is 3 inches. So provided your 2” shower drain line is feeding into a 3” line servicing the toilet your layout is fine.

You can also look up the max horizontal and vertical run lengths in the same section (link below)

https://codes.iccsafe.org/content/IR...itary-drainage

Last edited by PC7060; 04-28-2019 at 10:14 AM.
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Unread 04-27-2019, 09:36 PM   #13
fordperson
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thanks for your help, thats great.
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Unread 04-28-2019, 10:19 AM   #14
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Finally located the table that translates GPM to DFU.

2012 IPC TABLE 709.1 DRAINAGE FIXTURE UNITS FOR FIXTURES AND GROUPS

Shower (based on the total flow rate through showerheads and body sprays)

Flow rate: 5.7 gpm or less
DFU rating: 2
Minimum Trap size: 1 1/2”

Flow rate : Greater than 5.7 gpm to 12.3 gpm
DFU rating: 3
Minimum Trap size: 2”

Last edited by PC7060; 04-28-2019 at 10:25 AM.
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Unread 04-28-2019, 10:30 AM   #15
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Can you give us a link to that info, PC? I'd like to see one of our moderators add that to the Liberry. Question comes up regularly.
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