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Old 05-11-2013, 02:51 PM   #1
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Double sink rough in. . .


Hello.

Does anyone see any drain or venting issues with this rough in for a double sink ?? (All 1.5 inch pvc). The vertical vent tees into the shower vent in the attic and exits through the existing roof vent. I will be putting a 2x3 wall there, btw. Thanks!

Tom
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Old 05-11-2013, 03:05 PM   #2
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Double sink rough in. . .


Why is all that plumbing not behind that wall board instead of surface mounted?
Why do you have two drain adaptors when it could have been done with a one?

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Old 05-11-2013, 03:19 PM   #3
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Double sink rough in. . .


Hi, Joe.

Thanks for the quick reply.

As I mentioned, I will building a 2x3 wall there, so it will be inside, not surface mounted.

I would have preferred to do it with one adapter (and one P trap), but the double vanity has drawers in the middle which prevents any communication inside the cabinet. Does that make it clearer? Let me know if I'm missing something. Thanks again.

Tom
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Old 05-11-2013, 04:39 PM   #4
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Double sink rough in. . .


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Hi, Joe.

Thanks for the quick reply.

As I mentioned, I will building a 2x3 wall there, so it will be inside, not surface mounted.

I would have preferred to do it with one adapter (and one P trap), but the double vanity has drawers in the middle which prevents any communication inside the cabinet. Does that make it clearer? Let me know if I'm missing something. Thanks again.

Tom
looks good tom its always best for double bowl sinks to have there own traps....ben sr
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Old 05-11-2013, 05:16 PM   #5
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Double sink rough in. . .


Only 1 small issue. Above your cross you go horizontal with the vent below the sink. That would be a code violation. You cannot go horizontal with a vent until you are 6 inches above the flood level rim of the fixture. In English that would be the top of your sink cabinet. I would suggest you change that part and use 2 45 degree fittings to keep your vent vertical.


The reason for the above is based on the fact that you have no easy way to clean a vent. If your sink drain should block it would be possible for a blockage to form in that horizontal portion of your vent. The end result is now your sink is no longer vented.

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Old 05-11-2013, 05:32 PM   #6
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Double sink rough in. . .


Thanks, guys.

Terry Love recommended something like the following, but I would still have to modify it somewhat. (I will try to drag in those posts). Thank you for the explanation on the vents. If I can accomplish the goal by using 45's a little higher up, that seems like the easiest fix.

Here are the pics and my reply. . .



"Ahhhh. . .thanks, Terry. That makes sense, but I have one problem . . .

If I were to run it as you have pictured, I have a problem at the ceiling. As you can see from the attached pic, the vertical pipe "to the drain" lands on the plate above. To the left of the plate in the ceiling joists is a 2x8 on a flat, so I'd rather not drill through that. Above the small nail to the right in the pic is electrical wiring. So, I have to enter the attic through that hole you see there. Is is acceptable to come off with a 45 wye to get there? Please see my crude edit to your pic! Thanks again and I eagerly await your reply.

Tom"



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Old 05-11-2013, 06:20 PM   #7
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Double sink rough in. . .


The cross or the individually piped tees are both OK- when it comes to drain cleaning Terry's method is preferred because the cable has a route to follow and won't jump across the cross and enter your other sink.
And like Ghost said- use 2-45's to offset to the hole in the ceiling.
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Old 05-11-2013, 07:25 PM   #8
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Thanks, E.

The snaking issue was enlightening and makes perfect sense. I like Terry's suggested setup - seems best to lessen the chance of any future problems.

Originally, I had the offset to the hole at the top - I think I inherently knew about venting above the flood level - but in my haste to get moving on things (this project has been a bear!), I put it at the bottom to avoid working above my head when gluing the pieces together. I know, I got lazy!

I'm glad I posted on the forum and thank you all for the responses. Hopefully, I can get a pic of the finished rough in tomorrow.

Off to HD for the 600th time. . .

As an aside, the horizontal run in the attic to the roof vent is just over 5 feet - that shouldn't be a problem, correct?

Tom
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Old 05-11-2013, 08:56 PM   #9
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This should do the trick, no?
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Old 05-12-2013, 07:50 AM   #10
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This should do the trick, no?
excellent job tom...sorry for missing the vent issue in my 1st post..that being offset below the flood rim...snaking out drain with your installation now will be a breeze as mentioned ....ben sr
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Old 05-12-2013, 11:44 AM   #11
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Double sink rough in. . .


Thanks, everyone, for the advice!
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Old 05-12-2013, 01:52 PM   #12
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Double sink rough in. . .


Nice fix ...
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Old 05-12-2013, 07:37 PM   #13
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Thanks.

Off to the next question. . .
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Old 05-13-2013, 04:05 PM   #14
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Double sink rough in. . .


would have been easier to frame the wall first, before running the piping. now you have to frame around the piping.
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Old 05-13-2013, 08:35 PM   #15
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Double sink rough in. . .


They're just dry fitted, Danny. Although I may have to frame around them anyway in certain parts.

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