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Old 12-14-2011, 09:53 AM   #1
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Use 4" steel vent as 2nd floor drain?


I'm renovating a cape cod that has no plumbing upstairs. The house has one wet wall; the wall between the kitchen and the bath on the main floor. There is a cast iron drain here w/ two cast iron y-pipes stacked on it; one to the bathroom, one to the kitchen. Above that is the vent pipe that goes all the way up out the roof. It appears to be a 4" steel one.

While I have the drywall ripped out on the wet wall, I plan to run a hot and cold water lead up into the rafters and cap them so that I have the option of adding a bathroom up there in the future. For the drain, can I plan on using the vent as-is? it's in the right place to be the drain for the potential upstairs bathroom.

As an aside.. the hot/cold lines are 1/2" right now. Should I make them 3/4" if there's a potential to have them feed another bathroom?

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Old 12-14-2011, 10:00 AM   #2
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Use 4" steel vent as 2nd floor drain?


My guess is when you say rafters, you really meant floor joist.
If the walls open then I would replace the old cast with new PVC. if it's not leaking now it will at some point.
In order to really know if any of your plan will work a real plumber needs to be on site to look at it.
And yes the main should always be 3/4 running from the main supply line.

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Old 12-14-2011, 10:02 AM   #3
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Use 4" steel vent as 2nd floor drain?


Code violation in some places. Iíve seen it done but its not legal under most codes. wait and see what some of the other plumbers have to say on this form, some of these guys are pretty sharp. and may be in your area. Good Luck
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Old 12-14-2011, 10:15 AM   #4
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Use 4" steel vent as 2nd floor drain?


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My guess is when you say rafters, you really meant floor joist.
If the walls open then I would replace the old cast with new PVC. if it's not leaking now it will at some point.
In order to really know if any of your plan will work a real plumber needs to be on site to look at it.
And yes the main should always be 3/4 running from the main supply line.
Well.. floor joists of the potential upstairs bathroom, yes. There's currently nothing up there, though.. it's just eves. Ceiling joists, maybe?

I'll have to run some 3/4" over there in the crawl, then. Ugh. It's cold under there.

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Code violation in some places. I’ve seen it done but its not legal under most codes. wait and see what some of the other plumbers have to say on this form, some of these guys are pretty sharp. and may be in your area. Good Luck
What's the alternative? I could run a 2" PVC line up as a new vent, I suppose, but if there's an advantage to that I don't know what it is.
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Old 12-14-2011, 01:53 PM   #5
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Use 4" steel vent as 2nd floor drain?


youd have to revent existing fixtures above flood level of up stairs fixtures.
if you cut any fittings into the existing cast iron stack and keep the existing cast above it make sure the fitting you install inline with the stack is also cast iron
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Old 12-14-2011, 02:19 PM   #6
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Use 4" steel vent as 2nd floor drain?


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youd have to revent existing fixtures above flood level of up stairs fixtures.
That makes sense. So I need a new vent for the main level. no problem, there.

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if you cut any fittings into the existing cast iron stack and keep the existing cast above it make sure the fitting you install inline with the stack is also cast iron
So you're saying if I add anything to the main level that ties into the existing cast iron, I should use cast iron to do so. Got it.

Thanks for the input.
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Old 12-14-2011, 03:22 PM   #7
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Use 4" steel vent as 2nd floor drain?


Your best bet is to run a new 4" drain to the upper floor. The existing pipe is the vent for the main floor and should remain a vent. Tie the new pipe into your building drain below the main floor.
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Old 12-14-2011, 04:28 PM   #8
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Your best bet is to run a new 4" drain to the upper floor. The existing pipe is the vent for the main floor and should remain a vent. Tie the new pipe into your building drain below the main floor.
Ok. I suppose I can just put some CPVC in the wall and stick some loose caps on the ends in the crawl and the eves, then worry about the rest later if/when I add the upstairs bath.

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