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MADIYer11 · May 20, 2008, 05:50 AM

I want to add another bathroom and want to cut out the cast iron elbow for the existing toilet, so that I can install a WYE, reconnect the existing toilet and run a 4" PVC drain pipe to the new bathroom.

Is it permissible to cut about 3'' or so from the bell nearest to the stack and use a 4 band no hub coupling to connect the PVC to?

iamgrowler · May 20, 2008, 06:19 AM

Originally Posted by MADIYer11

I want to add another bathroom and want to cut out the cast iron elbow for the existing toilet, so that I can install a WYE, reconnect the existing toilet and run a 4" PVC drain pipe to the new bathroom.

I'm wondering if I can cut about 3'' or so from the bell nearest to the stack and use a 4 band no hub coupling to connect the PVC to?

If the horizontal section we see in the photo is going to a toilet and nowhere else, then it is a trap arm and you cannot pick up another bathroom on it.

However, if there is room to do so, you could always cut a wye into the vertical stack and take off from that point.

MADIYer11 · May 20, 2008, 01:20 PM

I don't think I can fit another WYE above the one that is there now. There is already a wye there for the toilet and if you look there is a third port where you see the 2" copper drain for the tub/lav fixtures.

Here are several more pics, maybe someone can offer some other options.

The bathroom that I want to add is right beside the existing bathroom on the same floor, and in the same direction of where the horizontal pipe for the toilet is.

massplumber2008 · May 21, 2008, 04:13 AM

MADIY:

Iamgrowler told you exactly how to do this, but I am sure you just don't know plumbing lingo... so...

You cannot connect into the horizontal line going to toilet. The reason is that you would be interrupting the vent for that toilet and that is plumbing 101 no-no!

You can connect into the vertical stack with a 4" x 3" cast iron NO HUB WYE fitting and mission or proflex transitioning shielded clamps... see pics. Below.

You would then transition off the 3" branch of the cast iron wye fitting to pvc using these same shielded clamps. Then install a dandy cleanout (see pic.) and run 3" pvc pipe over to bathroom.

This new bathroom will require it's own minimum 2" vent for the toilet and the sink....maybe also an 1.5" vent if tub/shower involved here as well... maybe? Let us know if you need help laying out the plumbing design.

When cutting into the vertical stack you absolutely MUST support the weight of the stack using a riser clamp (see pic. Below). Here, install the clamp tightly under the upper bell of the vertical stack and then support on both sides of the clamp with solid 2"x4" studs... don't install on an angle, but straight under the hanger ends (make 1/4" longer than measured and just bang them under hanger with a hammer).

Let us know what you think... MARK

MADIYer11 · May 22, 2008, 05:36 PM

Originally Posted by massplumber2008

MADIY:

Let us know if you need help laying out the plumbing design.

Let us know what you think....MARK

Thanks for your response.

Yes, if you don't mind, I'd like a little guidance with this.

The bathrooms would be side by side and are approx 5'x9' each. Both bathrooms would be at the rear of my house and on an outside wall. Both bathrooms would have tubs, lavs and toilets.

Thanks for any guidance you can provide.

massplumber2008 · May 22, 2008, 05:46 PM

Tell me if you are keeping the existing bathroom as it is... and are only adding a new bathroom so it is back to back... right?

You don't plan to redo the plumbing to the old bathroom.. right? You just want to add a new bathroom while disturbing the old bathroom as little as possible... yes..?

Let me know everything you can...

A drawing... even a crude one with old, and new clearly separated and WHERE THE drain line is in relation to bathromms would help me tons!

Get back to me...

.

MADIYer11 · May 22, 2008, 06:29 PM

The drain/ main stack as seen in this following pic, is on the back wall. The same back wall where the existing bathroom is and the other will be. That stack goes up the wall where the existing bathroom currently is.

The existing bath is right above the room in this pic.. You can see the stack in the left corner where the dryer vent is.. Everything in this room is coming out, including walls.

I do plan on redoing the existing bathroom plumbing because the toilet and tub will be moved to the back wall.

The new bathroom wall will be about 3ft the left of the existing tub drain shown in the pic.

massplumber2008 · May 22, 2008, 06:47 PM

OK... I am working double shift tomorrow... so won't have much on this until Saturday night or so... ok?

If I lose you and don't post by Sun AM... just PM me by clicking on my NAME by the picture in this post

I will try to draw something up and post soon.

Good night... MARK
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MADIYer11 · May 22, 2008, 06:48 PM

Ok thanks, I appreciate your help...

massplumber2008 · May 22, 2008, 06:57 PM

I am glad to help!

I won't forget... I promise. But if I do ;) --->> You PM me right away... and will hop right on it!

MADIYer11 · May 24, 2008, 03:48 PM

Bump!

blackwolf08 · May 24, 2008, 04:10 PM

Hellow is there any out there??

massplumber2008 · May 24, 2008, 04:21 PM

Hi madiyer11:

Hey there...

Once you stated... "I do plan on redoing the existing bathroom plumbing because the toilet and tub will be moved to the back wall. The new bathroom wall will be about 3ft the left of the existing tub drain shown in the pic"...

I am afraid I need some more info. Any chance of a crude drawing of exactly how the fixtures will be laid out in relation to each other??

Otherwise I am just guessing and that will not help you at all. Let me know and will pump out a plumbing design for you... MARK

MADIYer11 · May 25, 2008, 05:47 AM

The bathroom will be as shown in this floor plan. Tub, toilet and lav on the same wall. Both bathrooms are will be on the same wall as the main stack, with the furthest bathroom being approx 18ft from the main stack. My bathrooms will be side by side as pictured, but with tub to tub being back to back..

massplumber2008 · May 25, 2008, 05:59 AM

Great Pic...

Which bathroom is old... which new..

Where is the cast iron stack in relation to all this...

And you said, tubs would be back to back... what about the toilet and sink then..?

Get back to me.

MADIYer11 · May 25, 2008, 07:04 AM

Drawings of old and new baths..

massplumber2008 · May 25, 2008, 07:07 AM

Thank you!! Just what I needed!

I will work on this tonight and post a picture with plumbing design then.

Check back around 9:00 or 10:OO eastern time... ;)

Should have a good plumbing design by then... ;) Talk soon... MARK

MADIYer11 · May 25, 2008, 07:28 AM

Actually the main stack is closer to the outside than pictured.. it is actually on the outside wall..

massplumber2008 · May 25, 2008, 05:26 PM

Hey Madiyer11:

OK... just to get you started...

Obviously you need building, electrical and plumbing permits on this job.

Now... I assume you are planning to install the new bathroom while keeping the old one up and running... yes? Frankly, it would be easier to rip it all out and repipe all new... but probably is not feasible?

Anyway, all applies that I stated in my post #4 of this thread... "You can connect into the vertical stack with a 4" x 3" cast iron NO HUB WYE fitting and mission or proflex transitioning shielded clamps. You would then transition off the 3" branch of the cast iron wye fitting to pvc using these same shielded clamps. Then install a dandy cleanout (see pic.) and run 3" pvc pipe over to bathroom".

Then pipe new bathroom according to basic WET VENT principles... Here, you pipe that 3" pvc over to the toilet. Just before the 3" pvc ends as the toilet elbow itself, install a 3" x 2" wye fitting that will pick up the tub and sink. The vent for the sink acts as a wet vent for the toilet, the sink AND the tub.

This sink drain/vent must be 2" full size all the way until it connects into another 2" vent upstairs or in the attic.

Check out this picture below:

It presents a basic idea of what you need to do... EXCEPT you want to use wyes wherever it looks like pipes connect in a TEE fashion on the horizontal... ok? That is, no TEE fittings on horizontal pipes (vertical... sanitary tees OK). If you check the pic. Against what I described should make more sense.

Anyway... that should get you started. Are you planning to install this yourself..

I told you how to safely cut into a vertical cast iron stack... can be quite dangerous work if done wrong! And not to over-emphasize... but men have died doing this wrong... so just be sure you have the skills to match the ego if you intend to do this yourself!! ;)

Get back to me with any questions you may have... MARK

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MADIYer11 · May 25, 2008, 06:09 PM

I wanted to take out everything but the main stack. I was hoping I could remove the existing tee from the stack that connects the old toilet and install a wye and 4" pipe that could service both bathrooms. I wanted to move the old toilet as well.

Is it possible for me to service both bathrooms off the 3 or 4" pipe coming of the wye?