[PandJ]

Am I able to vent a toilet this way? Want a 2" vent for toilet and will only be for toilet.
https://www.amazon.com/clouddrive/s...J6aNCEWrSGNuIt8MfH?ref_=cd_ph_share_link_copy

 

[Ghostmaker]

You cannot dry vent any fixture under IPC below the flood level rim of the fixture.

 

[PandJ]

Same with UPC ? Also, to make sure my post is clearer, The 2" will have a 45 at the wall appx 12" behind it and go up above the fixture through the roof line as vent.

 

[PandJ]

How about this way with vent after toilet?

 

[Ghostmaker]

You must maintain a consistent 45 degree or better angle. Any thing less in any part is illegal under IPC. What code are you under?

 

[PandJ]

You must maintain a consistent 45 degree or better angle. Any thing less in any part is illegal under IPC. What code are you under?

UPC. Got it ,so no sweep or wye needed, just 45 off down "stream" of flow. Ok to 45 from at point near second pic ?

 

[PandJ]

This ok? It will be only fixture on this vent. The second is what i originally was going to do.

 

[TheEplumber]

This ok? It will be only fixture on this vent. The second is what i originally was going to do.

I pipe as your first image shows, but it usually has the lave draining into it. AKA, wet vent.
Roll the 3x2 above the center line of the 3"

 

[PandJ]

I pipe as your first image shows, but it usually has the lave draining into it. AKA, wet vent.
Roll the 3x2 above the center line of the 3"

hmm...so to be sure i under stand, when you say "roll", just have the wye straight up, then 45 off of that or 60 maybe?
Also, the tub drain could easily be drained into the toilet 4"(what I'm using) but I was concerned that a 2" vent would not be ok for both tub and toilet. I'm held to UPC here in my town

 

[PandJ]

i think this is what i'm looking for and what posters have suggested

No flat venting. Vent pipe inverts taken off above the center line of the drain. (UPC 905.1 & 905.2)
 Vents downstream of trap. (UPC 905.2)

 

[TheEplumber]

Your picture shows the 2" above the center line of the toilet. In the end, your inspector will have the final say- he may say that is a flat vent and not allowed. I plumb under UPC and it is excepted in my region. But if you strictly interpret the code- it is not allowed except when structual conditions force you to do the flat section.

The tub will need a vent unless you design your system according to the UPC horizontal venting requirements. Or the tub can drain into the vertical section of the toilet vent

 

[PandJ]

Your picture shows the 2" above the center line of the toilet. In the end, your inspector will have the final say- he may say that is a flat vent and not allowed. I plumb under UPC and it is excepted in my region. But if you strictly interpret the code- it is not allowed except when structual conditions force you to do the flat section.

The tub will need a vent unless you design your system according to the UPC horizontal venting requirements. Or the tub can drain into the vertical section of the toilet vent

Ok so I think your saying UPC ok with vertical drain off of a wye into watercloset drain before it gets to main vertical line(in my case). Is the pic ok? The 2" wye will be from tub. Also, can the 2" vent from tub serve as the toilet vent also through the wye?

I think this is the UPC that pertains to this:
706.2 Horizontal to Vertical. Horizontal drainage lines, connecting with a vertical stack, shall enter through 45 degree (0.79 rad) wye branches, 60 degree (1.05 rad) wye branches

 

[PandJ]

Here what I have modeled

Toilet, eye feeding tub drain and vent (45 in center), tub ptrap. Vent will be 2" thru roof for just these two fixtures.

I can also add vent upstream 4" vent on ground. It will be clean out

 

[TheEplumber]

If you have that much room to plumb- do it like this-- It will be code compliant

 

[PandJ]

Ok so ok if tub drains in from above toilet. I will do this if below is not final option

One other question I have is it possible to vent upstream of 4" main towards cleanout? (see pic) There is a kitchen sink, bath sink that are vented with 1 1/2 " independently before going to main, and a laundry drain also vented independently before going to main, all downstream of toilet.

I'm trying to make flows as simple as possible from my rookie position lol

 

[PandJ]

OK decided to drain n vent separately and tie in vents before roof line penetration. Not glued yet......works?

 

[TheEplumber]

OK decided to drain n vent separately and tie in vents before roof line penetration. Not glued yet......works?

No, not compliant. Can not have santees on their backs.
The vertical combo needs to be a santee.
At the start of the thread, I thought you had limited room.. You can and should eliminate the flat vents.

Where are your partitions above? Put the drain, as I pictured, below a partition and serve the group with one vent.... it's the simplest way and cheapest. What you have dry fitted is a waste of fittings and a inferior design- no offence meant.

 

[PandJ]

No, not compliant. Can not have santees on their backs.
The vertical combo needs to be a santee.
At the start of the thread, I thought you had limited room.. You can and should eliminate the flat vents.

Where are your partitions above? Put the drain, as I pictured, below a partition and serve the group with one vent.... it's the simplest way and cheapest. What you have dry fitted is a waste of fittings and a inferior design- no offence meant.

lol, no offense. I want straight feedback on what i'm doing to get it correct. I'm building a small granny unit myself and the drain vent code has always confused me. Water and gas no issue.

I understand and will remove the sani and put a wye. I'll move the mini stack to rear towards foundation wall. My hesitation was that I'd be adding additional drain 90 to get to main horizontal, but since i'm using 4" from toilet should be fine. I'll just use long sweeps.

The wall above foundation is exterior so I can rise up through there. I'll put together and post hopefully my final before glue model.

Be hard on my work, I appreciate it and learn from it...my intent here is to learn so don't hold back.

Thanks for feedback so far.

 

[TheEplumber]

This image will serve a bathroom group per UPC. This is a typical wet vet.
The max. trap arm for a toilet is 72"
Max tub or lav trap arm is 3'6"
All you need to do is locate the 2" vertical vent in a partition that satisfies the trap arm lengths. Usually the vent will be located in the same wall as the toilet and lav.
If you apply the 3'6" trap arm lengths to the image below- that equals 7' between the 2 traps before having to re-vent a fixture.

Now, to complicate it more-- the cross sectional area of your vents through the roof of your home must equal the cross sectional area of the bldg. drain, which in your case is 3" based on DFU's served.

Area of a 3" = 7 sq in.
Area of a 2" = 3.14 sq in
So you need 2 - 2" and 1- 1.5" vents through the roof. Or 1 - 3" vent.

 

[PandJ]

I'm venting the bath sink and the kitchen sink together on 1 1/2" vent through roof, and the laundry on its own 1 1/2" vent throught roof. So just toilet and tub on 2" through roof....if I ever get to building the roof lol