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The very popular general plumbing, toilets, sinks, faucets, pump problems, questions and answers discussion Forum
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Author:
didihow (TX)
We are building a new home, and my contractor has done something apparently very unconventional that both my architect and my interior designer are concerned about. He has run the water pipes through 4" drain pipes. In other words, the water pipes are inside the drain pipes in the foundation. We trust his work, but wonder about this since others have concerns. Has anyone ever heard of this before? Does anyone know any problems that could arise from this? Should we be worried?
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Author:
HytechPlumber (LA)
I am not very clear on your statement. If the water lines are just incased inside of a drain pipe material as a "conduit" then I see no problem. (I have done it a few times before) However the water lines should not be installed inside of an actual operating sewer line. A water line and a sewer line is not supposed to be ran in the same ditch along side each other much less one inside the other.
I actually can not visualize what you are saying because how would the lines enter and leave the pipes ? I would need to find out the excact purpose for the drain line piping that the waterlines are ran inside of. Sometimes a plastic pipe may be ran before driveways are poured then the lines are slipped through the plastic pipe afterwood. (as a conduit)
.... .... X
....... Good Luck .......
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Author:
hj
I am sure they are not "drain pipes" being used as drains because there would be problems making the water connecions, and the pipes would obstruct the drain. Therefore we need a better description of what you are talking about.
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Author:
shacko (MD)
I kind of agree with the O.P. that if they are being used as sleeves there is no problem, but hot and cold water should be separated. 
"If all else fails, read the directions"
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Author:
North Carolina Plumber (NC)
When running water lines under a slab, I always run them thru a corragated pipe. When passing thru a foundation wall I always sleeve them with a piece of PVC. In other words, trust your plumber.
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Author:
waukeshaplumbing (WI)
sounds like a better way and more expensive way to do it...id be happy...if there ever a problem you can just run new pipe through it.
id have to charge an extra few hundred for that one
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Author:
dlh (TX)
if he just sleeved the pipe there is no problem but if it is in fact a drain line then it is illegal to do period as water and sewer/drain pipes are supposed to have a minimum of 12" of seperation
if it passes inspection then i will assume it is a sleeve and not an actual drain line
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PLUMBERS "Protecting The Health Of The Nation"
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Author:
hj
quote; water and sewer/drain pipes are supposed to have a minimum of 12" of seperation
Not here indoors. We put the water lines in the same 10" trench as the drain lines.
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Author:
dlh (TX)
10" wide or 10" deep?
i have put them in the same trench but the water line must be on top of the sewer and have 12" of dirt separating them
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PLUMBERS "Protecting The Health Of The Nation"
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Author:
sum (FL)
really? I have water pipes crossing over the 3" PVC drains and only 2" above or below. Also I have hot and cold water line stubouts 3" left and right of a drain trap arm, there are surely not 10" apart...
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Author:
dlh (TX)
well if your drain floods the house that high then you have bigger problems
below ground it is a backflow thing that isnt a common problem but one we have to account for when installing the plumbing
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PLUMBERS "Protecting The Health Of The Nation"
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Author:
bill plumber (FL)
The minimum seperation you are referring to is between the building sewer and water lines not the building drain and water lines. You are fine Sum.
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Author:
hj
we put them at the same level next to the drain lines. One ditch, three or more pipes, one backfill, and the job is done.
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Author:
hj
May be one of the few plumbers who know the difference between a building sewer and a building drain.
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Author:
LemonPlumber (FL)
When trenched together it applies as said.Inside the footer or out.
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Good Luck. Insulate your hot piping, although costly, it will pay you back every day.
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Author:
dlh (TX)
i know the difference hj, they are the same pipe it just refers to its location. inside the building perimeter or outside of it
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PLUMBERS "Protecting The Health Of The Nation"
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Author:
hj
That is why I said, "You know the difference". I am not sure how many modern plumbers do, however. Many think the "sewer" is the large main line, and "drains" are the smaller branches to it.
Edited 1 times.
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Author:
dlh (TX)
so true. i know i did when i first became an apprentice that is
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PLUMBERS "Protecting The Health Of The Nation"
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Author:
bill plumber (FL)
Lemon reread 603.2. It states building sewer, which we know is outside the footer. I would love to see your undergrounds with water lines 12" above the top of the building drain at all points.
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Author:
LemonPlumber (FL)
Not laded in the same trench is what it looks like.And I have no problem with water lines crossing over the dwv.or in some cases under.as long as they are sleeved or have a proper separation distance.And on a shelf in the same ditch at a forty five degree angle above is the way I read, using the same trench.not 12"above the dwv.Not laying it next too and at the same trench bottom depth
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