Plumbing layout. Pass or Fail?

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Michael19

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Hello,
1st time posting here...
Just installed new drain system in my property. In the picture I attached I tried to explain what you are looking at. The kitchen sink drain has its own vent that runs through the roof. The 2" vent is basically what vents everything else. My question: From the picture does everything look ok with the drain system to pass a plumbing inspection? If not, please explain what doesn't and why.
I appreciate your time.
Thank You
 

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Stuff

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The 2" vent above the rim is horizontal. Vents need to be vertical (max 45º).
Kitchen sink can not provide a wet vent for the shower.
 

Michael19

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The 2" vent above the rim is horizontal. Vents need to be vertical (max 45º).
Kitchen sink can not provide a wet vent for the shower.
It rises above the fitting about 10" then takes a 90 about 6 inches to the rim joist then another 90 to the roof. This is not legal?
 

Michael19

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The 2" vent above the rim is horizontal. Vents need to be vertical (max 45º).
Kitchen sink can not provide a wet vent for the shower.
Oh and for the shower, since the trap is within 8' of the 2" vent, isn't this ok to vent the shower?
 

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It rises above the fitting about 10" then takes a 90 about 6 inches to the rim joist then another 90 to the roof. This is not legal?
Has to be above flood level of the fixtures served. Idea is if the drain is clogged waste could sit in the horizontal piece even after things drained.
 

Stuff

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Oh and for the shower, since the trap is within 8' of the 2" vent, isn't this ok to vent the shower?
Yes, you can route the shower to the vent on the left. Need to tie in above the toilet connection. Then the toilet becomes wet vented.
 

Jeff H Young

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I don't see a trap or vent for shower?
The toilet has a vent behind it ? or is it the far left that says 2 inch vent? If the latter then take those horizontal section out and use 2 45s to insure a pass . inspectors allow that type venting sometimes but generally frowned upon and a common write up
 

Michael19

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I dont see a trap or vent for shower?
The toilet has a vent behind it ? or is it the far left that says 2 inch vent? If the latter then take those horrizontal section out and use 2 45s to insure a pass . inspectors allow that type venting sometimes but generaly frowned upon and a common write up
I did use the 2" for the vent and I am going to change the setup for what you just pointed out. I'll post pictures when I finish.
Thank you.
 

wwhitney

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You have a number of issues, and you should have a plan to sort them all out before you make any changes.

One basic issue that I'm not sure if you're aware of of is that for a separately trapped fixture like the shower or a sink, the drain between the trap and the vent takeoff (the trap arm) has to be horizontal, is limited in length, and can't fall more than one pipe diameter. Also, you need to vent each fixture drain before combining drains (or, in the case of wet venting, as you combine drains).

1) WC--once you fix the horizontal 2" vent in the floor joist area (replace two 90s with two 45s), this is properly vented.

2) Lavatory--is the lavatory trap properly vented per the above description? If so, there should be a 1-1/2" vent taken off a san-tee (most likely) in the bathroom above. Your drain routing is fine, although it may be useful to use the lav drain to wet vent the shower, which would require rerouting the lav drain. [And if you end up changing the lav drain, using a single 45 to hit the stack wye would be more elegant than the LT90 and the combo.]

3) Shower--is there a trap between the joists that is hidden? If so, does it have a vent takeoff?

If not, the easiest way to vent the shower would be to lower its trap to below the floor joists, and to make use of the WC or lav vent via wet venting. To do that, the shower drain needs to stay separate from other drains until it joins the lavatory drain via a flat wye (horizontal wet venting), or until it hits the 2" vertical WC vent via a san-tee (vertical wet venting). With a 2" drain, at a perfect slope of 1/4" per foot, the shower trap arm can be up to 8' long.

4) Kitchen sink--you can't combine the drain with an unvented drain. So it is going to have to travel to the 3" stack on its own (unless you choose to individually dry vent the shower drain with in the joist system.) If you remove the combo where the shower drain comes in, you can leave the reast of the kitchen sink rain piping. Except that the vertical jog would be better done with two 45s, rather than two 90s.

Cheers, Wayne
 

Jeff H Young

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Don't know how you are seeing some of this Wayne? There's no kitchen sink in this picture it must be coming off some where else. and shower looks incomplete unless he has a santee and trap we cant see ? or something else but its either hidden and unknown as far as code or incomplete
 

wwhitney

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The kitchen sink drain is labeled on the right of the picture, and the narrative says it is separately vented. As for the shower, I agree, that's why I was asking for clarification.

Cheers, Wayne
 

Jeff H Young

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Got it Wayne it was off my screen just an an 1 1/2 line line going off the page
 

Michael19

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You have a number of issues, and you should have a plan to sort them all out before you make any changes.

One basic issue that I'm not sure if you're aware of of is that for a separately trapped fixture like the shower or a sink, the drain between the trap and the vent takeoff (the trap arm) has to be horizontal, is limited in length, and can't fall more than one pipe diameter. Also, you need to vent each fixture drain before combining drains (or, in the case of wet venting, as you combine drains).

1) WC--once you fix the horizontal 2" vent in the floor joist area (replace two 90s with two 45s), this is properly vented.

2) Lavatory--is the lavatory trap properly vented per the above description? If so, there should be a 1-1/2" vent taken off a san-tee (most likely) in the bathroom above. Your drain routing is fine, although it may be useful to use the lav drain to wet vent the shower, which would require rerouting the lav drain. [And if you end up changing the lav drain, using a single 45 to hit the stack wye would be more elegant than the LT90 and the combo.]

3) Shower--is there a trap between the joists that is hidden? If so, does it have a vent takeoff?

If not, the easiest way to vent the shower would be to lower its trap to below the floor joists, and to make use of the WC or lav vent via wet venting. To do that, the shower drain needs to stay separate from other drains until it joins the lavatory drain via a flat wye (horizontal wet venting), or until it hits the 2" vertical WC vent via a san-tee (vertical wet venting). With a 2" drain, at a perfect slope of 1/4" per foot, the shower trap arm can be up to 8' long.

4) Kitchen sink--you can't combine the drain with an unvented drain. So it is going to have to travel to the 3" stack on its own (unless you choose to individually dry vent the shower drain with in the joist system.) If you remove the combo where the shower drain comes in, you can leave the reast of the kitchen sink rain piping. Except that the vertical jog would be better done with two 45s, rather than two 90s.

Cheers, Wayne
Wayne,
Thanks for all the suggestions! I actually re routed most of the plumbing. I used a hole saw to connect the shower to the lav. drain. The lav. drain is vented through the roof. I also switched out the 90's you pointed out and installed 2 - 45s.
 

Jeff H Young

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Wayne,
Thanks for all the suggestions! I actually re routed most of the plumbing. I used a hole saw to connect the shower to the lav. drain. The lav. drain is vented through the roof. I also switched out the 90's you pointed out and installed 2 - 45s.
lets see the pictures how it wound up finaly done
 
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