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Msupsic 11-02-2010 11:12 AM

Installing a sink in garage - best drain solution?
I'm making a small winery in my garage, and will need to wash dirty dishes/fill and clean the wine tanks regularly. There is currently a cold water spigot in the garage. I was hoping to rig a wash basin up to this so I can use the water supply with an industrial stainless sink.

My main concern is draining the waste water. I would be mostly draining dead yeast, old wine, soap and water and a mild bleach solution used for cleaning tanks.

I might have to drill through the cinder block foundation, into the basement and run drain pipe to either the clothes wash basin, or over twenty feet away to the main waste stack.

What are my options and what, if any laws are there regarding waste water? Can I use PEX or flexible tubing for the drain tube, and just let the waste dump into the sinks down in the basement?

I want to make as few alterations to the garage as possible, in case we ever have to sell the house. It would be good if I can yank the system and leave as little a mess as possible for future owners.


ajstauffer 11-02-2010 01:01 PM

I was thinking of the same thing but wasn't sure how the draining and venting would work. I have a water spigot in the garage as well. I would like a wash basin or sink in my garage for rinsing parts and washing my greasy dirty hands without going inside. Look forward to hearing some responses on this. Good Luck!

Redwood 11-02-2010 02:27 PM

Lets throw in one big potential problem before we even consider the rest...

Is your garage heated? :eek:

Msupsic 11-02-2010 02:32 PM

I've blown in insulation and have a standalone heater in the space. Even without the heater, It doesn't get below 60F in there... why do you ask?

Redwood 11-03-2010 10:39 AM

Freezing concerns...
Your drain from the sink will need a vent through the roof or, be tied into an existing vent (check your local code), and will need a 1 1/2" or 2" (check your local code) drain pipe pitched downward at 1/4" per foot to where ever it ties into a drain at.

Msupsic 11-04-2010 10:33 AM

Is this allowed?
2 Attachment(s)
The closest drain pipe is for the sink in the basement. There is a dual wash basin that drains into the sewer main.

I've attached two diagrams. Would it be acceptable to tie into the drain pipe of the basement sink as shown? The basement sink, in turn, drains off into the main waste drain for the house.

kok328 11-04-2010 03:34 PM

I'd be worried that he garage sink would suck the P-trap dry on the basement sink and if you tied in above the P-trap, it would backup into the basement sink.

Msupsic 11-04-2010 03:45 PM

Don't they make some sort of valve that you can install so that this doesn't happen?

Would it be easier just to dump the drain pipe into the open wash basin as a temporary solution? I mean, I'll have to remove it when we sell the house anyway.

Redwood 11-05-2010 07:21 AM

You would need to vent the sinks properly to protect the trap seal.

An over simplified definition of venting is that it allows air to enter the drain behind the slug of water doing down the drain to prevent the water from siphoning out of the trap.

Msupsic 11-05-2010 08:46 AM

Think I've got it...
1 Attachment(s)
You're right about the venting, and I think I've got the solution to this layout. It's called a Studor Valve and does exactly what you described. It opens when there is a vacuum in the pipe, and closes to prevent fumes, etc. from leaking out of the valve.

See attached diagram.

Thanks for all of your help, everyone!

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