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oodssoo 12-26-2012 10:21 PM

Drain stack configuration
 
1 Attachment(s)
Hi,



I am about to get started on my plumbing for the basement project. This will begin with plumbing the drains for the dishwasher/sink with disposal, washer, and vanity/lav drain.



Please reference my novice sketch and let me know your opinions.

(What I am looking for is wether the "stack" order I have drawn is adequate)




Thank you in advance.

AndyGump 12-26-2012 10:52 PM

Well...1/4" per foot is what is generally code. Not 1/16" per foot drop.

Andy.

jklingel 12-27-2012 01:53 AM

check w/ a local code official about reducing the size of the stack at the top. generally, they are pretty large at the top. i think 3" is a minimum. btw: do you have your own septic, or are you on a city sewer? if on your own septic, avoid the garbage disposal like the plague.

oodssoo 12-27-2012 11:23 AM

Though you did not answer my question, I still thank you for taking a bit of time to respond to my post/question.

My question is specifically on the stack order of the drain lines per their specific purpose.

As for the Air Venting subject (in case any of you are wondering), I will use an Air Admittance Valve (AAV) for the kitchen sink/dishwasher, while I will vent out through a 2" air vent pipe for the Vanity/Lav and Washer drain.

AndyGump 12-27-2012 11:46 AM

I don't think the order would matter in the least to your system.

Andy.

oodssoo 12-27-2012 12:35 PM

What about combining all three drain lines into one 2" drain line? Wouldn't this solve my problem?

AndyGump 12-27-2012 12:40 PM

I think that you should not put three 2" lines into one 2" line.
Should be a min. of a three inch line they feed into.

Andy.

oodssoo 12-27-2012 12:58 PM

I meant 3". Typo sucks!

TheEplumber 12-27-2012 01:34 PM

Quote:

Originally Posted by oodssoo (Post 1080285)
Hi,





(What I am looking for is wether the "stack" order I have drawn is adequate)




Thank you in advance.

The answer is no. If you want more info as to why- you need to supply more info. Such as- other vents, length of trap arms, etc.
You also need 1/4" per ft grade..

mr leak 12-27-2012 05:06 PM

odosso regarding drain venting
 
you have 5 drain fixture units Washing machine 2 sink with disposal 2 lav 1

slope must be 1/4 inch per ft and is limited on distance but a 2 inch vent is fine

hammerlane 12-27-2012 09:25 PM

Quote:

Originally Posted by AndyGump (Post 1080562)
I don't think the order would matter in the least to your system.

OK...Andy "Thinks" the order doesnt matter??? Ask your local building inspector if a major over a minor would not matter.

Then you have your answer.

Javiles 12-27-2012 09:48 PM

The answer to your question is no.. if your are discharging a washing machine that needs to go on bottom if dish washers then on the kitchen sink disposal or tail piece needs to be air gaped and trapped that stack is over loaded if in 2 inch and if using an AAV min 3 inch on a washer vent and drain. again that's under my code. also must have a clean out on that stack.

oodssoo 12-27-2012 10:02 PM

Quote:

Originally Posted by Javiles (Post 1080880)
The answer to your question is no.. if your are discharging a washing machine that needs to go on bottom if dish washers then on the kitchen sink disposal or tail piece needs to be air gaped and trapped that stack is over loaded if in 2 inch and if using an AAV min 3 inch on a washer vent and drain. again that's under my code. also must have a clean out on that stack.

Sorry, Javiles, but I don't quite understand your statement... Can you please reword what you said?

I think you're saying that the washer needs to go on the bottom, the kitchen sink with disposal, then the vanity go on the top?

On the note of venting, I have the option to vent straight up into a 2" vent pipe or installing 3 aav's. Though, I think I will go the old fashion way of pipe venting...

Javiles 12-27-2012 11:23 PM

C on top B center A at the bottom as per your drawing.

This is what the code wants a mechanical discharge at the bottom of a gravity drain. and then it would be lavatory sink above a line discharging solids which would be your disposal. plumbing systems are designed to self cleaning, you always want clean water up stream of a solids discharge. also like others have mentioned length of those waste arms are important. if your in the south east your probably under the IPC thats the one we are under but we also have the south Florida plumbing code which covers areas not addressed under the IPC. should check with your local building official. hope this helps.

hammerlane 12-28-2012 08:28 AM

information given...has it been received??


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