|Posted by CEA on June 10, 2004 at 15:35:59:|
|In response to Re: Need your opinion on my layout|
None of the fixtures shown are properly vented, because all of their vent connections tie into their drain horizontally. A fixture vent must tie into its drain at an angle within 45 degrees of vertical. A vent can't run horizontally at all until it's at least 6" above the flood rim of the highest fixture it serves (usually a lav).
I'd recommend you consult with a plumber at this point for a better layout, but if it were me, I'd probably do the following. Stud out the wall behind the toilet as your wet wall. It looks like you've got enough room in the long dimension that losing 6" isn't going to be a deal-killer. Extend the new 4" stack up into that wall and don't offset over to the roof vent until you're at least 6" above the lav (in the attic would work, too). Vent the shower and toilet with a vertical vents in the wet wall, from the fixture drains to the vent offset above. As long as the fixtures are properly vented, you can tie them into a single 3" drain that runs where you show the horizontal 4" line under the floor, then into the stack with a wye.
The lav will need a fixture vent of its own--even if you could tie its drain into the stack above the point where the other combined drains tie in, the lav is going to be too far from the stack to use the stack for venting.
If it were me, I'd turn the tub around and plumb two walls instead of three; you still have to vent both the lav and tub, but at least they could share a common drain. If you keep the tub where it is, you'll have to make the drain-to-vent connection in or close enough to the wall to tie the vent in vertically.
Hope this helps. Good luck.
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