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Old 03-24-2013, 08:54 PM   #16
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Wet venting


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Originally Posted by miguel24932 View Post
What do you mean kitchen sink is at 36". That part I don't understand.
This isn't the only thing you don't understand. Most plumbers take 4-5 years of school coupled with the same amount of on the job training before they're allowed to work unsupervised. You're trying to get a crash course here and it's going around in circles.
Do you have a specific project you're trying to complete? If so, give us a drawing or pictures and we'll walk you through it

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Old 03-24-2013, 09:03 PM   #17
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36 inches is the point they are saying your vent would no longer flood. Maybe they could of said 30 inches, maybe 24 inches. 36 inches is what they are agreeing on. Then just add 6 inches. Why did they come up with this number? I would hope from experience and common sense. I would hope a bunch of plumbers made all the drain pipes of a house in clear plastic. Then sat around for weeks watching what happened as water went down the drain
I read 6" above the highest fixtures not 36". Even online sites say 6". How can water reach 36" vertical and cause waste water to get into a vent line?
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Old 03-24-2013, 09:08 PM   #18
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This isn't the only thing you don't understand. Most plumbers take 4-5 years of school coupled with the same amount of on the job training before they're allowed to work unsupervised. You're trying to get a crash course here and it's going around in circles.
Do you have a specific project you're trying to complete? If so, give us a drawing or pictures and we'll walk you through it
how is it going around in circles? Every site I go to says when you re-vent a vent pipe before going horizontal it needs to at least 6" above the highest fixtures flood rim now all of a sudden your 42"? My simple question was if I wanted to add a shower in my basement I obviously can't just vent through the main waste stack in the basement. So, other option is to re-vent it up and over the first floor fixtures. From what I gathered I could tie into the stack 6" above the highest fixtures on that floor. Am I wrong here? Another option is to run a separate vent through the roof but not practical in my situation. I enjoy plumbing. Not an expert just want to make sure I get my facts corrects that's all.
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Old 03-24-2013, 11:06 PM   #19
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Ghostmaker, showers have to be individually vented? Does that mean a two inch vent all the way through the roof? Nothing else connected to that vent?
That is the type of vent he explained. In his quote an individual vent. No it does not have to go by itself out the roof.
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Old 03-24-2013, 11:09 PM   #20
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how is it going around in circles? Every site I go to says when you re-vent a vent pipe before going horizontal it needs to at least 6" above the highest fixtures flood rim now all of a sudden your 42"? My simple question was if I wanted to add a shower in my basement I obviously can't just vent through the main waste stack in the basement. So, other option is to re-vent it up and over the first floor fixtures. From what I gathered I could tie into the stack 6" above the highest fixtures on that floor. Am I wrong here? Another option is to run a separate vent through the roof but not practical in my situation. I enjoy plumbing. Not an expert just want to make sure I get my facts corrects that's all.
Most modern sinks are installed with a 36 inch flood level rim.

If you want to learn plumbing I suggest you look into an apprenticeship. I'm thinking your a troll.
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Old 03-25-2013, 07:56 AM   #21
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Most modern sinks are installed with a 36 inch flood level rim.

If you want to learn plumbing I suggest you look into an apprenticeship. I'm thinking your a troll.
a troll? what is that??
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Old 03-25-2013, 08:05 AM   #22
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Most modern sinks are installed with a 36 inch flood level rim.

If you want to learn plumbing I suggest you look into an apprenticeship. I'm thinking your a troll.
Flood Level Rim:The top edge of a receptacle from which water overflows

what does this have to do with my vent pipe? I know you don't water backing up into the vent through the drain but water overflowing the rim of the sink. What does that matter?
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Old 03-25-2013, 09:17 AM   #23
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Every site I go to says when you re-vent a vent pipe before going horizontal it needs to at least 6" above the highest fixtures flood rim now all of a sudden your 42"?
They're assuming that you have a kitchen sink on the floor, which would be the worst case scenario. You won't have to go higher than 42", although we always go 52" off the floor to stay above electrical boxes when we're travelling horizontally in a wall with a vent.

6" above the flood rim of the highest fixture = 42" above the floor.

Unless you don't have a kitchen on that floor... then 6" above a 30" vanity = 36" off the floor

Next is a toilet.... 6" above ~ 17" to the bowl rim = 23" off the floor

(a tub should be pretty close to the same as a toilet)

Shower pan .... 6" above (call it a 6" flood rim just to cover most shower pans) = 12" off the floor.



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Old 03-25-2013, 12:48 PM   #24
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They're assuming that you have a kitchen sink on the floor, which would be the worst case scenario. You won't have to go higher than 42", although we always go 52" off the floor to stay above electrical boxes when we're travelling horizontally in a wall with a vent.

6" above the flood rim of the highest fixture = 42" above the floor.

Unless you don't have a kitchen on that floor... then 6" above a 30" vanity = 36" off the floor

Next is a toilet.... 6" above ~ 17" to the bowl rim = 23" off the floor

(a tub should be pretty close to the same as a toilet)

Shower pan .... 6" above (call it a 6" flood rim just to cover most shower pans) = 12" off the floor.



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Thats what I thought. I knew it made no sense. You explained it well unlike others.
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Old 03-25-2013, 02:31 PM   #25
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They're assuming that you have a kitchen sink on the floor, which would be the worst case scenario. You won't have to go higher than 42", although we always go 52" off the floor to stay above electrical boxes when we're travelling horizontally in a wall with a vent.

6" above the flood rim of the highest fixture = 42" above the floor.

Unless you don't have a kitchen on that floor... then 6" above a 30" vanity = 36" off the floor

Next is a toilet.... 6" above ~ 17" to the bowl rim = 23" off the floor

(a tub should be pretty close to the same as a toilet)

Shower pan .... 6" above (call it a 6" flood rim just to cover most shower pans) = 12" off the floor.



/ thread
Thanks for that clarification. Another question...When its to difficult to re-vent a fixture that too far from the main stack you would have a secondary vent through the roof. My question is when you do that do you still use the main waste stack as the drain or do you run a whole new waste/vent stack for that fixture and then tie into the main stack in the basement?
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Old 03-25-2013, 06:21 PM   #26
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try a book like this it will help you a lot and give you a great reference to come back to in the future
http://www.amazon.com/Ultimate-Guide.../dp/1580114857
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Old 03-25-2013, 08:42 PM   #27
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Thanks for that clarification. Another question...When its to difficult to re-vent a fixture that too far from the main stack you would have a secondary vent through the roof. My question is when you do that do you still use the main waste stack as the drain or do you run a whole new waste/vent stack for that fixture and then tie into the main stack in the basement?
Maybe i'm confused by your question. Your drain would tie into the most convenient place in the waste system, assuming there are no codes prohibiting the tie in location.
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Old 03-25-2013, 10:26 PM   #28
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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.
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Old 03-25-2013, 10:26 PM   #29
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Maybe i'm confused by your question. Your drain would tie into the most convenient place in the waste system, assuming there are no codes prohibiting the tie in location.
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?
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Old 03-25-2013, 10:59 PM   #30
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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?

waste and vent is a whole other animal with its own set of rules, depending different codes.

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