[Ron]

Bottom of the outlet or water level of the trap.

Let's say for arguments sake you have a WC on top of a 4" stack that drops 10 storys. Let's also say the stack has a vent coming off of it 1' below the WC and continuing full size through the roof.

Does this meet code?

Good question I have a e-mail off to a state inspector, will let you know soon I hope.

This has come up in code related classes once before.

 

[ILPlumber]

Good question I have a e-mail off to a state inspector, will let you know soon I hope.

This has come up in code related classes once before.

It meets code in my state. The offsets in the stack would be made with 45's

 

[1498]

Up here we are allowed a max 3' vertical leg or drop then we have to turn it horizontal. Total pipe 5 ft max then vent.

OBC 7.5.6.3 (3) (Discussing vents for siphonic fixtures)

(a) 1 000mm (3.3ft) in the vertical plane ***
(b) 3m (10ft) on the horizontal plane

There's a little bit of OBC wisdom for you that will surely come in handy one day

***Pop quiz!!

Anyone know WHY the vertical drop is limited to 1M (3.3ft) ???

 

[Protech]

Dunno, but it would work forever with no problems.

Bottom of the outlet or water level of the trap.

Let's say for arguments sake you have a WC on top of a 4" stack that drops 10 storys. Let's also say the stack has a vent coming off of it 1' below the WC and continuing full size through the roof.

Does this meet code?

 

[OldSchool]

OBC 7.5.6.3 (3) (Discussing vents for siphonic fixtures)

(a) 1 000mm (3.3ft) in the vertical plane ***
(b) 3m (10ft) on the horizontal plane

There's a little bit of OBC wisdom for you that will surely come in handy one day

***Pop quiz!!

Anyone know WHY the vertical drop is limited to 1M (3.3ft) ???

Dont forget I am Oldschool ....it going to take a while before I am up to the new OBC code from the old OBC..... back then we didn't even use metric .... all imperial

3' was the number back then and 5 ft of pipe max to vent ..... now you say I can run 10 ft of pipe then vent . Some of the stuff they have changed are way different like wet venting from the floor above. More than likely it will take a while find it all out as most of the time it is the inspector that tells you what is wrong... The old OBC code will never get called out by the inspector as wrong as it exceeds the new OBC code

 

[1498]

Dont forget I am Oldschool ....it going to take a while before I am up to the new OBC code from the old OBC..... back then we didn't even use metric .... all imperial

3' was the number back then and 5 ft of pipe max to vent ..... now you say I can run 10 ft of pipe then vent . Some of the stuff they have changed are way different like wet venting from the floor above. More than likely it will take a while find it all out as most of the time it is the inspector that tells you what is wrong... The old OBC code will never get called out by the inspector as wrong as it exceeds the new OBC code

The code has changed quite a bit. Many of the people I work with refuse to hear ANYTHING about this new code. Which is fine, I suppose. If it has worked for 20 years, I'm sure it should work for another 20.

The reason I brought it up was that this extra distance allowed is that it comes in handy when circuit venting commercial bathrooms. E.g. When two public bathrooms (mens and womens) have toilets on opposing sides, you no longer need two separate circuit vented drains and can reach both men and women WC's (as long as they are not further than 20" apart.

Also comes in handy in large master bathrooms where the designer places the WC and lavs on opposite sides of the room.

 

[bartnc37]

Sorry there RW but the max drop in Wisconsin is 36" from the waterline of the W.C., not from the floor. Don't know where you got 6 foot or 60 inches whatever it was. I think a freestanding spit sink in a dentists office might be 60" but a W.C. is 36" 82.33-4

 

[Pipe Rat]

I worked with a plumber 25 years ago when I was loaned out to another company when work was slow that would bring the stack directly up to the closet flange and use a side outlet (for shower or tub) san tee and long sweep back to the wall to catch the lav and vent the fixtures. Never seen anyone do it like that since. I never added that to my bag of tricks. :no:

 

[Tommy plumber]

Florida code states max vertical distance from fixture outlet to point where vertical turns to horizontal is 24" (trap weir). Of course as House Plumber states, the exception is wash. machine standpipe; it can be 18"-42" above the trap. FL Plumbing code 1002.1


Floor mounted fixtures with integral traps (W/C, floor-mounted urinals, etc.) are also governed by this rule, unless it has been changed.

 

[Pipe Rat]

Tommy I don't think that section applies to water closets as the vertical drop in question is below the trap weir.

 

[Tommy plumber]

Tommy I don't think that section applies to water closets as the vertical drop in question is below the trap weir.

I do understand what you're saying. Think of this, theoretically the vert. distance from bottom of a W/C to where pipe turns to horiz. couldn't be unlimited, say 10'. That could siphon the water seal out of the bowl. As you know, design of DWV is to protect the trap seals. When I used to do new constr., we would cut a piece of 4" pvc 2 ft. long, that was the w/c riser. We never exceeded 2 ft. Then from 4"x3" closet bend, you were allowed 3 ft. to the point of vent. Then distance to point of vent for a w/c changed to 10 ft. Now there is no maximum distance to point of vent for a w/c.

 

[Pipe Rat]

Don't forget Tommy this Plumber I worked with used a san tee for the vent in or just below the floor joist so the vent is there close it's the waste falling straight down thats in question

 

[Tommy plumber]

Bottom of the outlet or water level of the trap.

Let's say for arguments sake you have a WC on top of a 4" stack that drops 10 storys. Let's also say the stack has a vent coming off of it 1' below the WC and continuing full size through the roof.

Does this meet code?

Can you post a quick sketch? I am having trouble picturing this in my mind. Forgive my dumbness. :laughing:

 

[Pipe Rat]

Can you post a quick sketch? I am having trouble picturing this in my mind. Forgive my dumbness. :laughing:

Something like this Tommy

 

[SlickRick]

That drawing looks like what Matt was describing.

 

[plumber666]

Pic would be to code if it had a vent stack and a yolk vent.

 

[1498]

Pic would be to code if it had a vent stack and a yolk vent.

Vent stack yes.

Yolk vent, I don't think so. I may be wrong, but I believe that for yolk vents we only count floors that include fixtures. I remember someone discussing "Mechanical floors" in High Rises and whether or not it should be counted considering it does not have fixtures.

 

[Plumbducky]

Sorry there RW but the max drop in Wisconsin is 36" from the waterline of the W.C., not from the floor. Don't know where you got 6 foot or 60 inches whatever it was. I think a freestanding spit sink in a dentists office might be 60" but a W.C. is 36" 82.33-4

82.33-4 is Indirect and Local waste. I think you meant 82.32 (4)(b)1.c.

You are correct on the 36". I think that the 60" was the pedastal or cuspidor.

 

[plumber666]

And back to the original question, 1 meter in Canada. That's 39 3/8". We get the extra 3 3/8" for being metric up here.

 

[DownHill]

There is no maximum distance for IPC. And if you think about it, there shouldn't be. The drop could be 1,000 feet and the mechanical design of the toilet will fulfill the requirement for the trap to be reprimed/filled. Venting only comes into play in relation to other fixtures.

Which leads to the real question for me.

Why in the world are we tolerating all of these B.S. interpretations of code? And DIFFERENT codes. Putting in the same fixtures with different measurements and requirements. And with all of the different codes & interpretations with the same fixtures, the plumbing works. Which proves that any Hitler type inspection enforcement is pretty stupid and that 1" hasn't always been proven to matter.

"My code says this and my code says that". All of them....ALL OF THEM should be the same. There is no reason why they are not except for $$$, unwillingness to change, and ignorance.

(State Licensed Master Plumber. Commercial, residential, repair. And still plenty to learn despite my little rant above. There's my introduction. Thanks.)