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Old 03-26-2013, 04:44 PM   #31
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Wet venting


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This subjected is never ending most people get confused by the term wet vent, and its usually applied incorrectly. when venting a system you'll have a wet or dry vent. all this means is that the base of the stack will ether be wet or dry now where you tie this vent in is the question. if you are re venting (connecting in to an existing vent servicing a completely different branch ) you'll need to connect it as mentioned above the flood rim of the servicing fixture. sink shower/tub/toilet? the object is in the event of a clog in the branch you connected too, the water will not back flow in to the vent. in an ideal system you would have one vent per branch depending on the size of the branch and the amount of branches your roof would be full of vents through the roof very unsightly and prone to roof penetration problems. that's one of the reasons for re venting along with accessibility for a VTR location.
what is VTR?

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Old 03-26-2013, 05:16 PM   #32
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VTR "vent through roof"
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Old 03-26-2013, 06:56 PM   #33
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Also wet vents are limited by bathroom group fixtures. It's defined in definitions. A bathroom group fixture is a shower or tub a water closet a bidet a lav sink and a emergency floor drain in that bathroom. All fixtures on that wet vent must be one of the above and on the same floor and cannot exeed the vent to trap distance from the wet vent or you will need to revent that particular fixture.

Trap to vent distance 1 1/2 trap on 1 1/2 pipe is 6 foot
2 " trap on 2 inch pipe is 8 foot

1 1/2 trap on 2 inch pipe is 8 foot

Etc etc
You can also wet vent up to 2 bathroom groups on a single wet vent.

But you can not tie any other fixtures not part of the bathroom group into the vent.


The wet vent is sized based on the fixture load chart. And the wet vent sizing chart
1 1/2 wet vent 1 DFU
2" wet vent 4 DFU
3" wet vent 10 DFU

There are many considerations in plumbing that is why it takes a good 5 years to learn the trade....
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Old 03-26-2013, 07:09 PM   #34
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Originally Posted by Ghostmaker View Post
Also wet vents are limited by bathroom group fixtures. It's defined in definitions. A bathroom group fixture is a shower or tub a water closet a bidet a lav sink and a emergency floor drain in that bathroom. All fixtures on that wet vent must be one of the above and on the same floor and cannot exeed the vent to trap distance from the wet vent or you will need to revent that particular fixture.

Trap to vent distance 1 1/2 trap on 1 1/2 pipe is 6 foot
2 " trap on 2 inch pipe is 8 foot

1 1/2 trap on 2 inch pipe is 8 foot

Etc etc
You can also wet vent up to 2 bathroom groups on a single wet vent.

But you can not tie any other fixtures not part of the bathroom group into the vent.


The wet vent is sized based on the fixture load chart. And the wet vent sizing chart
1 1/2 wet vent 1 DFU
2" wet vent 4 DFU
3" wet vent 10 DFU

There are many considerations in plumbing that is why it takes a good 5 years to learn the trade....
I don't see any of this in my UPC...
Did the OP ever say what his code standards are?
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Old 03-26-2013, 07:41 PM   #35
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Originally Posted by Ghostmaker View Post
Also wet vents are limited by bathroom group fixtures. It's defined in definitions. A bathroom group fixture is a shower or tub a water closet a bidet a lav sink and a emergency floor drain in that bathroom. All fixtures on that wet vent must be one of the above and on the same floor and cannot exeed the vent to trap distance from the wet vent or you will need to revent that particular fixture.

Trap to vent distance 1 1/2 trap on 1 1/2 pipe is 6 foot
2 " trap on 2 inch pipe is 8 foot

1 1/2 trap on 2 inch pipe is 8 foot

Etc etc
You can also wet vent up to 2 bathroom groups on a single wet vent.

But you can not tie any other fixtures not part of the bathroom group into the vent.


The wet vent is sized based on the fixture load chart. And the wet vent sizing chart
1 1/2 wet vent 1 DFU
2" wet vent 4 DFU
3" wet vent 10 DFU

There are many considerations in plumbing that is why it takes a good 5 years to learn the trade....
How do you calculate DFU's? Is it just the total amount of fixtures using a drain?
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Old 03-26-2013, 07:47 PM   #36
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How do you calculate DFU's? Is it just the total amount of fixtures using a drain?
From the DFU chart in the code book.
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Old 03-26-2013, 08:41 PM   #37
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From the DFU chart in the code book.
Is it just the total amount of fixtures using a drain?
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Old 03-26-2013, 08:50 PM   #38
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Is it just the total amount of fixtures using a drain?
No, each fixture is assigned a value- they're all listed in the DFU chart
This chart determines your drain size as well as the vent size
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Old 03-26-2013, 09:02 PM   #39
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Originally Posted by miguel24932 View Post
Basically what im asking is if its to difficult to re-vent and you run a secondary vent through the roof do you have to also extend that vent to the lowest level, i.e. the basement and make it a waste/vent stack?
If the vent is going through the roof by itself and is connected to the fixture in question, then it's not a waste/vent stack, it's just a vent.

Unless i'm misunderstanding you.

You have a drain (lowest part of fixture connection)

A trap arm (where the fixture connection intersects the drain and vent)

Then the vent on top. Whether the vent ties into the vent stack somewhere in a wall or goes through the roof doesn't really change the terminology of a single fixtures drain/vent system. A stack generally refers to something that is taking more than one fixture worth of air or waste.
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Old 03-27-2013, 09:15 AM   #40
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Originally Posted by TheEplumber View Post
No, each fixture is assigned a value- they're all listed in the DFU chart
This chart determines your drain size as well as the vent size
Can you provide a link for this chart?
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Old 03-27-2013, 10:14 AM   #41
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Can you provide a link for this chart?
http://lmgtfy.com/?q=DFU+chart
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Old 03-27-2013, 10:38 AM   #42
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I don't see a chart.
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Old 03-27-2013, 08:22 PM   #43
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Old 03-27-2013, 08:28 PM   #44
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[QUOTE=TheEplumber;1146486]I don't see any of this in my UPC...
Did the OP ever say what his code standards are?[/QUOTE

Pure IPC bro..... He never did say the code he was using yet....
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Old 03-27-2013, 08:31 PM   #45
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http://www.fairfaxcounty.gov/dpwes/c...ture_units.htm

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