Hello all,

I've been lurking in this forum for a while and I've learned a lot. Thanks to all you experts.

I'm planning a new 1st floor bathroom. I'll be running a new 3" PVC drain line horizontally (1/4" per foot slope) in the basement from the main stack to the new bathroom about 15 feet away.

I've made a sketch of the proposed layout here. The drawing does not show the vents - I'm intending to run 2" vent from both the lav and the washer; they would join in the ceiling and continue 2" up through the roof (this is a new vent in the roof).

Is the toilet and the tub wet-vented properly with this arrangement or should I add more vents. The local code is UPC 2000. Anything else I should be worried about?

Any other suggestions or comments are welcomed. Thanks very much!

Roy

Tom and Mark are better at rough ins but if you up that drain to a 4" you can reduce your slope to 1/8' p/f. Comes in handy if spacing is tight.

The stack is only 3", so no 4" here. Fortunately I have plenty of room, could probably even go steeper if I had to ;-). Thanks.

Hello, yes your drawing would work as a flat rough system, your washmachine drain and lav drain will be wet vents for your tub and toilet, just move the 3x2 combo tee for the washmachine within one foot from the tub drain tee.
also when you install the tees for the washmachine and lav set the 2" branch on a 45 degree slope so your wet vent is higher than the 3" main trunk line then use the 1/8 bend elbow to level off and slope up to your stacks for the washmachine and lav drains.
good luck ----Zeke----

Good morning ,
Sorry Cuthbert, but you fall under the UPC that don't allow wet vents and even ifv it did your tub would still be out of code. You can not discharge a major fixture (your toilet) past a unvented minor one,(your tub).
Having said that, if you ran up vent in the wall behind your tub this might put you back in code. Milo and Growler both work on the West Coast Under UPC and they may have nore to say on the subject.. Regards, tom

OK, thanks Zeke... so something more like this drawing. The 2 combos slope up at 45 deg like you said and I run that 2" to the lav and washer up between the joists. Looks like I'll need to drill some joists then. How long does the 45 deg section need to be before I take the 1/8 bend back to horizontal? Thanks.

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Originally Posted by speedball1

Having said that, if you ran up vent in the wall behind your tub this might put you back in code.

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Thanks Tom, I'm sure I can do that (add the vent line in the wall)... I'll think some more on it. Missed your post before I sent that last drawing ;-) Thanks again.

Milo and Growler ought to be working your thread. You fall within one of the strictest codes this nation has. Berfore I did anything I would take my drawing down to your local Building Department and have them check it over. Good luck, Tom

That gets tricky because as a homeowner I'm not allowed to submit plans or pull a plumbing permit, only a licensed plumber can do that. Although I am legally allowed to do the actual work, go figure. Anyway, there is a potential can of worms there. But still, I want to do the work correctly.

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That gets tricky because as a homeowner I'm not allowed to submit plans or pull a plumbing permit, only a licensed plumber can do that.

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Sure am glad I work under The Standard Plumbing Code. If you got a plumber to pull the permit would you have to work under his supervision or could you do the job on your own? Cheers, Tom

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Originally Posted by speedball1

If you got a plumber to pull the permit would you have to work under his supervision or could you do the job on your own?

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I could legally do it on my own.

Back to the vent question (maybe the west coast guys will chime in), I can vent every single fixture if necessary, in fact the roof penetration is directly above that new wall that the WC and tub are on. Is it required to vent the toilet? And/or if I vent everything does that mean I don't need to roll the combos to 45 deg above horizontal (that would save drilling the joists)?

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Originally Posted by speedball1

you can not discharge a major fixture (your toilet) past a unvented minor one,(your tub).

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That makes perfect sense now that I think about it - the toilet would siphon the tub trap wouldn't it.

Thanks.

"Is it required to vent the toilet? " rule of thumb, if it drains it needs a trap, if it has a trap it needs a vent.

I shouldn't post while eating lunch ;-). I just meant does it need its own dedicated 'dry' vent. After re-reading a few things I believe it does. Thanks.