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Old 08-17-2017, 04:06 PM   #1
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Water Closet addition


Hi,

My household has bene approved with permits to install new editions to our home. We live in California. We want to install a water closet, among others (2 toilets, 4 sinks, shower).

We are committed to see this work completed with our own hands. My father and I are learning as we go and we need help verifying our work.

His schematic for the water closet. We live in a 1st story home.

I don't believe we can connect the vent to the toilet flange before the elbow and horizontal drain pipe from diagrams I've seen.
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Old 08-17-2017, 04:19 PM   #2
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Re: Water Closet addition




1. It will connect to our new main sewer drain pipe to the right.
2. We followed the 1/4inch per every foot slope guideline.
3. The closeout is about 5 feet upstream. We plan to build a sink there, which has correct venting and drain pipes.
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Old 08-17-2017, 05:08 PM   #3
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Re: Water Closet addition


Caveat... I AM NOT A PLUMBER... just a GC who would check a plumbing question just like you......

But I think you are OK.... your 2" vent off the toilet drop I think is fine as long as you are using a vertical Y and maintaining a vertical vent run untill 6" (?) above toilet ......and assuming you are using long sweep 90's and a combo (not a santee) where your toilet joins the main line.

Any reason you are using 4" and not 3...????
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Old 08-17-2017, 06:08 PM   #4
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Re: Water Closet addition


The 4" tee is not allowed on it's back or side-must be vertical- so replace it with a wye (4x4x3). Then make all the toilet arm 3". use a 4x3 flange too.
Some inspectors will really question your venting.....

My preferred way to do your task-
Remove the toilet tee connection completely. You don't need it there.
At the cleanout, use a 90 instead- in the vertical
On top the 90, use a 4x4x3 santee- point the branch toward the flange.
Then, continue the 4" tee riser through the floor, add a cleanout, then reduce to 2" for the vent.
Back to the tee- on the branch add a 3" piece and 90 to stub up to the flange

* Depending on other fixtures in the bath, you may be able to horizontal wet vent too. This could make things even easier to pipe.......
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Old 08-17-2017, 08:29 PM   #5
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Re: Water Closet addition


We are using 4" instad of 3" because he believes the bigger diameter will flow better and cause less clogs.

Thank you both for the comment about the Santee not allowed on its back or side.

My dad setup the whole plumbing layout himself before I could take a look at it. He decided to go with a lot of 4" and 2" pipes. We will need to go back and rework a lot of his main pipe connections. His plumbing idea is a bit cumbersome. I will post another thread (showing the three rooms we plan to build) with better diagrams of how he has set it up so far.

Question: For the main drain pipe when connecting vertical to horizontal, can I use either a 4x4x4 WYE or 4" WYE Combo 1/8 Bend?
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Old 08-17-2017, 09:25 PM   #6
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Re: Water Closet addition


Quote:
Originally Posted by Miagani View Post
We are using 4" instad of 3" because he believes the bigger diameter will flow better and cause less clogs.

Thank you both for the comment about the Santee not allowed on its back or side.

My dad setup the whole plumbing layout himself before I could take a look at it. He decided to go with a lot of 4" and 2" pipes. We will need to go back and rework a lot of his main pipe connections. His plumbing idea is a bit cumbersome. I will post another thread (showing the three rooms we plan to build) with better diagrams of how he has set it up so far.

Question: For the main drain pipe when connecting vertical to horizontal, can I use either a 4x4x4 WYE or 4" WYE Combo 1/8 Bend?
The wye and combo are the same pattern except the combo has a 45 molded into it.
To get a wye to join a vertical pipe- you need to add a 45- which makes it a combination of a wye with a 45
So, you are saving the step of gluing a fitting by going with a combo. Both are the approved method when connecting vertical to horizontal or horizontal-horizontal pipes.
Tees are only to be used horizontal to vertical

While 4" is okay, 3" will handle 3 toilets per UPC. So save some money and use 3" instead....
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Old 08-17-2017, 09:52 PM   #7
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Re: Water Closet addition


Thank you for confirming.

3" would have definitely been the dream, but my dad got overly excited to start. He bought a lot of 4" pipes.
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Old 08-17-2017, 10:29 PM   #8
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Re: Water Closet addition


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Thank you for confirming.

3" would have definitely been the dream, but my dad got overly excited to start. He bought a lot of 4" pipes.
Most places they are returnable.... it's worth the trip you'll find out in most all instances.
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Old 08-18-2017, 12:04 AM   #9
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Re: Water Closet addition


Alas, he sealed them together in the midst of his excitement. Now in attempts to remedy our problem without needing to spend so much to better it.

Father is like a kid when it comes to being hands on. Starts playing and verifying later.
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Old 08-18-2017, 01:05 PM   #10
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Re: Water Closet addition


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Originally Posted by Miagani View Post
Alas, he sealed them together in the midst of his excitement. Now in attempts to remedy our problem without needing to spend so much to better it.

Father is like a kid when it comes to being hands on. Starts playing and verifying later.
Do you have a lot of brothers and sisters...?
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