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Old 09-28-2012, 03:19 PM   #31
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code requirement same here, 30" minimum recommended by National Kitchen and Bath Association. I like 36" (when you can) for larger folk .... just a thought

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Old 09-28-2012, 03:30 PM   #32
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code requirement same here, 30" minimum recommended by National Kitchen and Bath Association. I like 36" (when you can) for larger folk .... just a thought
I planned it for 36. Definitely the better way to go I think.

My plumber told me he'd put the whole pipe underground if I trench it out. I rented a 30lb breaker to get this done tomorrow. I figure that'll be easier that using the sledge for a trench. I meant to ask my plumber but I forgot; how wide should I make the trench.

Also, the pipe currently runs through a metal "I" beam. The beam has a whole punched out of it for the pipe to pass through, but It'd be difficult for me to replicate this lower, and plus I don't want to bust the concrete around the beam for structural reasons.

Is there a limit on how many 45 degree bends this waste pipe has? I was thinking I could have him kick the pipe away from the wall on the 45 where it comes down vertically, then run it basically a few inches in front of where the pipe is now only underground. It would then have to have another 45 degree bend to connect back to the existing plumbing in the room where I broke up the floor.

Hopefully this makes sense for me to get some answers. My plumbers unavailable today and he's coming Monday so I want to make sure I have everything as ready as possible for him. That being said I don't want to dig a whole trench if it's not even possible for him to do this.
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Old 09-28-2012, 04:11 PM   #33
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I would recommend waiting until you meet with him to break out the trench. I know this may cause a delay on your part. you could layout where you want your plumbing fixtures on the floor and then he would be able to figure out how difficult it would be to run the piping. It would be a shame to have the trench and then he tells you on Monday it won't work. it's easier to layout of on top of the slab and know exactly where the trench needs to go, make sense?

post a photo of the beam if you can.

make sure (I'm certain your plumber will do this) to use long sweep 45's. Hopefully Alan will chime in on this as I'm not a plumber. the more turns and bends you have the greater the chance for clogs.
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Old 09-29-2012, 08:21 AM   #34
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This is the beam here



I will try to get a hold of him before trenching. Let me know what you think about the beam. Again it seems to me it's not a good idea to break concrete under it....
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Old 09-29-2012, 09:59 AM   #35
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45* fittings do count as a sweep fitting, there's no short and long 45*.


That said, in my jurisdiction, the limit is 135* change of direction in the horizontal on a 3" and larger without requiring the use of a cleanout. If you offset around the footing for the steel post, it would be a good idea to bring a 3" (or is that 4"?) wye up in the wall and have a cleanout in one of the rooms. Note if it's 4" you can use a 4x3 wye (3" is minimum cleanout size)

Your other option is to make a vertical offset with two 90* fittings as close to the steel as you can, and box it in later with some sort of soffit.
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Old 09-29-2012, 10:57 AM   #36
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45* fittings do count as a sweep fitting, there's no short and long 45*.


That said, in my jurisdiction, the limit is 135* change of direction in the horizontal on a 3" and larger without requiring the use of a cleanout. If you offset around the footing for the steel post, it would be a good idea to bring a 3" (or is that 4"?) wye up in the wall and have a cleanout in one of the rooms. Note if it's 4" you can use a 4x3 wye (3" is minimum cleanout size)

Your other option is to make a vertical offset with two 90* fittings as close to the steel as you can, and box it in later with some sort of soffit.
The pipe is a 3" pipe. I assume the cleanout would go before the changes in the pipe's direction?

Attached is a picture of the start of my trench. This is where I'm hoping the pipe can go underground. Basically the pipe would come away from the wall then down into the trench, then Y back into the existing part of the pipe that is underground. I hope this will be ok.

I'm not sure I understand the vertical offset. Would two 90 degree fittings even be allowed? I assume yes as long as there a cleanout?

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Old 09-29-2012, 11:21 AM   #37
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Vertical changes of direction do not require cleanouts.


Horizontal ones in excess of 135* Do require them. Cleanout should go upstream from the change of direction.

The 90 degree offset is allowed Given that :

Changes in direction from vertical to horizontal are made using long sweep fittings.


In other words, following the flow of the waste... The top 90 can be a short sweep 90 because it is dropping down from a horizontal into a vertica. The bottom 90 has to be a long sweep, because it is dropping from a horizontal into a vertical, and it will help push the waste away from the bottom of the offset.
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Old 09-29-2012, 11:26 AM   #38
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I'm not sure I understand a vertical offset. What would this end up looking like?

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