Is this legal?

[Mr_David]

see what i am talking about? section of vent below floor.

to picky?

Found this. I think this is what they meant by wet venting fixture on same floor only. These fixtures are considered to be on the same floor.

 

[Mr_David]

Wet venting not allowed here but let's say I'm in a IPC area and wet venting is allowed

What if I had one vent for all 3 fixtures.
The W.C. requires 2" vent min. If I stack the tub and sink on the W.C. vent, Do I have to increase the vent to 3"all the way up to the sink? or just to the tub trap arm? I'm thinking all the way to sink.

 

[frodo]

Wet venting not allowed here but let's say I'm in a IPC area and wet venting is allowed

What if I had one vent for all 3 fixtures.
The W.C. requires 2" vent min. If I stack the tub and sink on the W.C. vent, Do I have to increase the vent to 3"all the way up to the sink? or just to the tub trap arm? I'm thinking all the way to sink.

use a 3x2 bushing in the top of the so tee, , then,,minimum 2'' vent out the roof
you can do that, but not with a low heal as shown, you can use a side outlet tee. 905.6 2 fixtures may be served by a common vertical pipe when each such fixture wastes separately into approved double fitting having inlet openings at the same level.

 

[phishfood]

Just looked that up. You could run 2" from the water closet connection to the tub connection, then 1 1/2" to the lav arm. Minimum pipe size for toilet is 3", so need 1 1/2" vent.
909.2.2 and 909.3

 

[frodo]

............

 

[Mr_David]

I have seen pictures of side outlet fitting but never one in use. Not even sur eif they are available here in local supply house. next time I go in .If I remember I'll ask about them

 

[shaken-n-stirred]

I think you are mistaken with your last post. You said you could use a 2" between the tub and the WC and 1 1/2 above that. Since the sink drain requires a 1 1/2 drain, and since if you use it as a wet vent you have to upsize it, then you need a 2 inch vent all the way up.

this makes even more sense if you think that a WC is required to have a 2" vent anyway.

I think. With all the respect due all here. I am not expert.

 

[phishfood]

No, the sink could have an 1 1/4" drain, but that is besides the point. IPC allows one drainage fixture unit to drain through an 1 1/2" wet vent, which is what a standard lavatory is rated at. Since the tub will add another 2 DFU to the vent, it would need to be 2". IPC only requires that any drainage pipe be vented by a vent pipe that is at least 1/2 the diameter of the drain pipe. Minimum pipe size for a toilet drain is 3", so an 1 1/2" vent meets that requirement as well.

If you search Florida Plumbing Code, a link should come up, I believe it is ecodes.biz, or something like that. Download Chapter 9, Vents, and you can look up the sections I mentioned.

That is why we always like to know where a poster is from, as codes tend to vary from one area to another.

 

[frodo]

please read the chart,
look at the vent piping for 1 1/2 pipe. 8 fixture units allowed then look at exception [3]
excludes 6 units traps and W/C so it has to be upsized to 2''

all water closets, in the upc, are vented minimum 2''

 

[phishfood]

Which is why I qualified my answer as being according to IPC.

 

[frodo]

Which is why I qualified my answer as being according to IPC.

i read an article that was about venting toilets with a 3/4 vent,
they say its works,

 

[phishfood]

I just have to wonder if 3/4" is enough to provide positive pressure relief.

 

[shaken-n-stirred]

WC REQUIRES 2" vent, the lav is not relevant. The lave could drain on a 1 1/4 or 1 1/2 so upsizing from the 1 1/4 could be to a 1 1/2, but the WC requires a 2 in anyway. Therefore the question .. or atleast the most recent question in the thread is "do I need a 3" to the lav and then reduce it.

Answer 3" is not required
lav requires 1 1/4 but because it is wet must be upsize to a 1 1/2 BUT
since the WC requires a 2" it must to a 2" AND
above the lav under any circumstances it can not be reduced from what is below that level.

Yes?

 

[Caduceus]

This is interesting.....

 

[phishfood]

WC REQUIRES 2" vent, the lav is not relevant. The lave could drain on a 1 1/4 or 1 1/2 so upsizing from the 1 1/4 could be to a 1 1/2, but the WC requires a 2 in anyway. Therefore the question .. or atleast the most recent question in the thread is "do I need a 3" to the lav and then reduce it.

Answer 3" is not required
lav requires 1 1/4 but because it is wet must be upsize to a 1 1/2 BUT
since the WC requires a 2" it must to a 2" AND
above the lav under any circumstances it can not be reduced from what is below that level.

Yes?

Just to make sure that you are understanding where I am coming from.

I am basing my answers off of Florida Building Code, Plumbing. That code is based on the International Plumbing Code. If you are looking for UPC or SPC compliant answers, I am the wrong plumber to talk to.

With the code I work under, a toilet does not require a 2" vent.

And, once again according to IPC, once the trap arm of the fixture that is the wet vent attaches to the vertical pipe, the pipe above that point is a dry vent, and only need to comply with sizing requirements for a vent pipe, not for a wet vent.

Under IPC, the only instance (that I am aware of) that requires the vent pipe to be the same size as the drainage pipe is for the dry section of a waste stack vent system. Which cannot receive the drainage of water closets, so does not apply to the situation at hand.

 

[Tomtheplumber]

Can anyone explain how to read flow vs pressure drop chart interference to sizing water distribution piping

 

[frodo]

Can anyone explain how to read flow vs pressure drop chart interference to sizing water distribution piping

with you taking your masters test,,,jump on in here and explain

why a vent must be rolled on what degree? above the what?

i get confused

 

[frodo]

Just to make sure that you are understanding where I am coming from.

I am basing my answers off of Florida Building Code, Plumbing. That code is based on the International Plumbing Code. If you are looking for UPC or SPC compliant answers, I am the wrong plumber to talk to.

With the code I work under, a toilet does not require a 2" vent.

And, once again according to IPC, once the trap arm of the fixture that is the wet vent attaches to the vertical pipe, the pipe above that point is a dry vent, and only need to comply with sizing requirements for a vent pipe, not for a wet vent.

Under IPC, the only instance (that I am aware of) that requires the vent pipe to be the same size as the drainage pipe is for the dry section of a waste stack vent system. Which cannot receive the drainage of water closets, so does not apply to the situation at hand.

YEP!!! upc and Ipc are worlds apart.

upc here,,,,1 1/2 minimum vent.

2'' minimum on a water closet

if you wet vent,,the vent has to be 1 size larger

 

[Tomtheplumber]

I would say a drain and you will have to roll it on a 45 with a wye

 

[frodo]

where vents connect to a horizontal drainage pipe, each vent pipe shall have its invert taken off above the drainage center line of such pipe downstream of the trap being served'


rolling a 16th bend is permitted


is this what your looking for?

http://www.bing.com/search?q=pressure+drop+chart+interference+to+sizing+water+distribution+piping&form=PHEXPC&pc=HPDTDFJS&mkt=en-us&refig=36fceb63fb8d4bafa69aa567ebf9d46c&pq=pressure+drop+chart+interference+to+sizing+water+distribution+piping&sc=0-0&sp=-1&qs=n&sk=&cvid=36fceb63fb8d4bafa69aa567ebf9d46c



http://www2.iccsafe.org/states/Virginia/Plumbing/PDFs/Appendix%20E_Sizing%20of%20Water%20Piping%20System.pdf