New DWV Layout

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Kujo

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We've been renovating our house and now we're down to the plumbing. All the old drains and the one vent has been removed and lines dug up to the septic tank. I've busted up the slab in several places and have dug out the ditches. I've seen what bad plumbing does and want to be sure the new plumbing is done right. I'm attaching a link to several pictures of the rooms and my proposed layout. I appreciate all the feedback to get this right.

Link to pictures - http://s1356.photobucket.com/user/kujo32/library/Plumbing
 

hj

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Other than the fact that many fixtures are unvented it looks doable. The measurements showing the lengths of the pipe are almost completely irrelevant.
 

Kujo

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How do you attach a vent under the slab. Everyone keeps saying it has to be vertical but that's not possible under the slab. The pipe can only go up at the 2 or 3"coming down the wall. The shower and tub need a vent under the slab. The washer and laundry sink can use the drain coming from upstairs as it's vent? Same with downstairs toilet it can use the 3"pipe coming down? I was thinking of tying the upstairs vanity sinks into the toilet before the stack for a vent to the toilet? Sound right to you?
 
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BMWpowere36m3

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Vents can come up vertically thru slab, you just have to run the waste line near walls.... so the vent can go up vertically.
 

Kujo

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Best I can do is slope it to where either pipe comes down the wall then go vertical. If I put the wye at the top then slope it to the 3"pipe that be good enough? I can get more slope going up by the 3"pipe
 

hj

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quote; The washer and laundry sink can use the drain coming from upstairs as it's vent? Same with downstairs toilet it can use the 3"pipe coming down? I was thinking of tying the upstairs vanity sinks into the toilet before the stack for a vent to the toilet?

As you stated, those are DRAIN pipes, therefore you CANNOT use them as vents.
 

Kujo

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I was told that's considered wet venting. More misinformation huh?
 

Reach4

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If it helps, note that 45 degrees upward is considered vertical.
 

Kujo

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Could I take and run 2 two inch pipes into the 3 inch , one for the tub upstairs drain and the other as a vent pipe but also tie the washer and laundry sink into it and let it be the vent for the downstairs fixtures. That would have all the fixtures on the same floor so would that be rite?
 
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Kujo

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I've attached a new sketch of the bathroom and added a vent on the other. Any better?
 

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Kujo

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Here's what I have so far. The vents are pointed correctly but are in the general area they will be. Any changes need to be made before I glue it. Thanks in advance!
 

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Hammerlane

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How do you attach a vent under the slab. Everyone keeps saying it has to be vertical but that's not possible under the slab.

Build a wall to separate the fixtures and run the vent up vertical in that wall. In this pic the wall is used to separate the shower from the toilet.
 

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Kujo

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In that picture the vent pipe runs horizontal before it goes vertical. Everybody keeps telling me that is wrong. The pipe can only go vertical with no horizontal at all. I've got walls on two sides to use and the end result would look like that picture. Thanks for the input!
 

Hammerlane

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In that picture the vent pipe runs horizontal before it goes vertical. Everybody keeps telling me that is wrong. The pipe can only go vertical with no horizontal at all. I've got walls on two sides to use and the end result would look like that picture. Thanks for the input!

In this setup all venting is vertical until well into the ceiling before the vent goes horizontal.
The toilet is wet vented via part of the shower drain. In this photo attached, the pipe marked with green is always vent. It is venting the shower and toilet.
The pipe marked with orange is technically the wet vent because when the shower is running, water(wet) is travelling thru that section of pipe thats marked with orange. But when the toilet is flushed, the section of pipe marked with orange has air being pulled thru it(vent) for the toilet. Im no expert in wet venting but I believe this is correct.
 

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Kujo

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I've started my project over and I've attached some new pictures. It's this layout any better? Thanks in advance!
 

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