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Old 10-18-2012, 04:37 PM   #1
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review my bath drain plans


Building a new bath in old basement, these are the drain plans as best I can illustrate.

The idea of venting throws me off - does this look OK to you? Do I need a vent in the wall behind the sinks?

Also where's the smartest place to put P-traps? Can I combine the shower/bath traps just upstream of the toilet?



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Old 10-19-2012, 09:44 AM   #2
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Really? No one?

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Old 10-19-2012, 09:57 AM   #3
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You show no venting for any fixtures- each one requires a vent as well as the sewage pump. I suggest you do a little research on venting and redraw your layout.
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Old 10-19-2012, 10:03 AM   #4
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Thanks for the reply. Sewage well is easy to vent, no problem there.

My theory is the shower & bath vent each other in that layout & I'll probably put a vent behind the toilet in the wall unless the upstream fixtures serve to vent the toilet...?

If this was your design, where would you put vents?
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Old 10-19-2012, 10:30 AM   #5
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Originally Posted by boulderguy View Post
My theory is the shower & bath vent each other


I would make up a quick drawing for you but i gotta finish getting ready to go to work.
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Old 10-19-2012, 10:34 AM   #6
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Also in reference to your first question, NO you can't combine two fixtures into one trap.


No offense intended here, but you might be better off getting a local pro to help you with this project.
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Old 10-19-2012, 11:21 AM   #7
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None taken I recognize I'm a noob with this & still feeling my way around.

And ironically the layout was designed by a pro who's no longer in the picture. The bath/shower as interchanging vents was his idea & I can't see any reason why it wouldn't work.

I'm thinking the same can be done with the 2 sinks, a trap on each, upstream of the junction in the vanity. But if not it's easy enough to vent into the wall right there instead.

I assume I'm putting vents in the walls behind the toilet & the sewage well too.

Here's a better picture -



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Old 10-19-2012, 09:39 PM   #8
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Quote:
Originally Posted by boulderguy View Post
None taken I recognize I'm a noob with this & still feeling my way around.

And ironically the layout was designed by a pro who's no longer in the picture. The bath/shower as interchanging vents was his idea & I can't see any reason why it wouldn't work.

I'm thinking the same can be done with the 2 sinks, a trap on each, upstream of the junction in the vanity. But if not it's easy enough to vent into the wall right there instead.

I assume I'm putting vents in the walls behind the toilet & the sewage well too.

Here's a better picture -



Time for a drawing ........ brb.
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Old 10-19-2012, 09:45 PM   #9
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Quote:
Originally Posted by Alan View Post
Time for a drawing ........ brb.
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Old 10-19-2012, 09:48 PM   #10
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Vents come off the top of pipes, and intersect with walls. We don't run vents horizontal under the floor to hit walls.

Hope this makes some sense.
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Old 10-19-2012, 11:21 PM   #11
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It does, thanks. Since my drawing is in 2d you can't see there's a 28" deck above the tub vent which gives me some vertical space but I'd have to travel horizontal into the wall to go higher. That OK? Tub fill line is 25" above floor.

Same with the sinks, I have maybe 12" of vertical in the vanity above the traps before I'd have to go horizontal into the wall for more vertical.

Stumped on the toilet, I'd have to vent from maybe 8" downstream of the trap to get any vertical (in the wall).


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Old 10-20-2012, 12:19 AM   #12
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The vents and vertical waste lines go in the walls. They shouldn't be in the vanity or tub enclosure.
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Old 10-20-2012, 10:38 AM   #13
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If there's some reason you're not planning on putting them in the walls, say so now.



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