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Old 11-24-2015, 12:02 PM   #1
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Plumbing Second Floor Addition Help


Hi Guys,

I am about a month away from starting to plumb the waste lines for my new second floor addition. Attached are the waste line schematics and the second floor plan.

Does anyone have any recommendations on how to go about tackling this job? Where would you located the 4" stack pipe.

Also to note, this house has a full unfinished basement.

Thanks,

Pat
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Old 11-24-2015, 04:20 PM   #2
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My biggest concern is how to I go about feeding the 4" pipe that ties all of the fixtures together through the 2x8 floor joist...
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Old 11-29-2015, 03:41 AM   #3
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Did you sheetrock directly to the joist? If not you can hang it.

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Old 11-29-2015, 03:43 AM   #4
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Quote:
Originally Posted by Rafacacho View Post
Did you sheetrock directly to the joist? If not you can hang it.

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I'm confused...
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Old 11-29-2015, 09:38 AM   #5
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Patrick if you make the three 3" drops you will not need to cut through joist. You only run 3 inch to toilets and washer on second floor. You tie it all together in the basement.
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Old 11-29-2015, 10:19 AM   #6
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Roger. I may need to drill through one joist for one of the toilets. I will get the drawings to you this week...
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Old 11-29-2015, 12:20 PM   #7
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Having been through a similar issue.....another vote for multiple lines.

I remember my inspector telling me "You can never have enough venting.

If it was me....

Toilet in the 'N Bath'....I'd vent just the toilet on the interior wall. Less issues running a vent up an interior wall vs exterior wall. You avoid the top plate issues. If that wall sits on another...then it's a straight shot down and gives you a great place to run a snake.

Sink, tube and master shower could share a common vent. I believe in that case they could all be 1 1/2". All could share a common drain pipe. (2"?) I can't remember the formula. Shower must be 2", but a tub can be 1.5"

I'd put the washer and master sink on the same drain and vent. Once again, a vent in that common wall to the roof would make for a good snake point.

Master toilet and vent.....dedicated.

As I said above.....it's always easier to avoid exterior walls when running vents. But when you do, Simpson makes a plate to put on the top cap.
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Old 11-29-2015, 01:28 PM   #8
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Quote:
Originally Posted by patrickpresti View Post
Roger. I may need to drill through one joist for one of the toilets. I will get the drawings to you this week...
Ok cool. Is the joist under a toilet? Or you need to wack it to get to a wall?
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