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Old 07-14-2013, 05:20 PM   #1
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Securing utility sink drain line without access


I am trying to add a utility sink in our garage in a house with a finished basement.

There is an area between the two floors where I can run the drain with enough slope to connect to the main drain line of the house. However, the problem is it would be about 18ft of pipe. I wouldn't have access to the area where I run the pipe, but am only pushing the pipe through to the other side, meaning I only have access to both ends of the pipe. The problem is securing the drain pipe as I don't have access to the middle area where the pipe runs.

Any ideas or suggestions? If it is a simple drain line for a utility sink should it still be secured somehow besides at the two ends?

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Old 07-14-2013, 05:44 PM   #2
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Securing utility sink drain line without access


Finding access is up to you- but plastic drain pipe needs to be supported at 4ft intervals.

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Old 07-14-2013, 06:57 PM   #3
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Securing utility sink drain line without access


You also will need a vent on that drain.
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Old 07-14-2013, 07:55 PM   #4
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Securing utility sink drain line without access


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Finding access is up to you- but plastic drain pipe needs to be supported at 4ft intervals.
Is there a different material as far as pipe goes that would work better for my scenario or is finding access and using pvc my only choice?
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Old 07-14-2013, 08:09 PM   #5
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Securing utility sink drain line without access


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Is there a different material as far as pipe goes that would work better for my scenario or is finding access and using pvc my only choice?
There's cast iron- it needs support at it's joints or within 18" of the joint and every piece must be supported. It comes in 10ft lengths

Then there is copper DWV pipe- it's spendy, and I believe it needs to be supported at 8ft spacing- maybe 10ft, I can't remember the code spec.
It comes in 20ft lengths

Thats about it
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Old 07-14-2013, 08:14 PM   #6
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Securing utility sink drain line without access


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You also will need a vent on that drain.
Since this is in the garage would an air admittance valve be sufficient for venting as long as code allows it? There isn't anything over the garage so I could technically run a vent all the way up but it seems the valve would be easier.
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Old 07-14-2013, 08:15 PM   #7
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Originally Posted by TheEplumber View Post
There's cast iron- it needs support at it's joints or within 18" of the joint and every piece must be supported. It comes in 10ft lengths

Then there is copper DWV pipe- it's spendy, and I believe it needs to be supported at 8ft spacing- maybe 10ft, I can't remember the code spec.
It comes in 20ft lengths

Thats about it
Ok thanks a lot for the answers. It looks like I am going to have to rethink how to get enough access to secure the line. I was too focused and excited that I found where I could run the drain that I forgot about securing it
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Old 07-14-2013, 09:16 PM   #8
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Securing utility sink drain line without access


Is the garage conditioned space year round? Likely not. So, have you thought about issues with the water pipes freezing in the winter?
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Old 07-14-2013, 10:13 PM   #9
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Securing utility sink drain line without access


The question is do you want to do this right or just get it so it will work. I had too run a kitchen sink drain flat for about forty feet. About every 3 years they just snake it. No vent, it works fine, oh and it was 1 1/2 not two inch.
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Old 07-14-2013, 11:36 PM   #10
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Is the garage conditioned space year round? Likely not. So, have you thought about issues with the water pipes freezing in the winter?
There is a hot/cold faucet in the garage already. Pipe is inside a wall shared with conditioned space and looks like the water gets recirculated. I'll probably add an access so I can shut off the water at that point during the winter and disconnect the lines to the sink.

As far as the trap I can probably do that inside of conditioned space? There should be room there as well.

As far as the vent goes, I think I can technically run it the same distance over to where the main drain connection is as there is another vent pipe from a sump pump there. Would that pose any issues?
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Old 07-14-2013, 11:45 PM   #11
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Securing utility sink drain line without access


Here is a hair-brained idea for you-
Lay the pipe on a board or something rigid. Secure the pipe down
Then slid it as a unit into position and secure the ends.
If the board doesn't sag- your pipe is supported.
Now you just need to make the connections at the ends....
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Old 07-15-2013, 08:47 AM   #12
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Securing utility sink drain line without access


That vent from the sump pump is probably for radon, NOT for water drains. You should not use that.
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Old 07-15-2013, 12:20 PM   #13
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That vent from the sump pump is probably for radon, NOT for water drains. You should not use that.
Ah, ok then yeah a studor/aav vent may be my easiest choice. Anything wrong with using one of those for a utility sink in a garage? Otherwise it will be a 30-40ft pipe up to attic/roof.
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Old 07-15-2013, 12:22 PM   #14
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Securing utility sink drain line without access


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Originally Posted by TheEplumber View Post
Here is a hair-brained idea for you-
Lay the pipe on a board or something rigid. Secure the pipe down
Then slid it as a unit into position and secure the ends.
If the board doesn't sag- your pipe is supported.
Now you just need to make the connections at the ends....
Yeah I was trying to think outside the box on this one and this is a good idea. After dwelling on it I think I am just going to cut a big enough access for me to crawl inside the area from the garage. Once inside there is plenty of room to maneuver and then I can patch up the drywall or even put in a permanent access for future use if needed.
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Old 07-15-2013, 12:32 PM   #15
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Securing utility sink drain line without access


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Ah, ok then yeah a studor/aav vent may be my easiest choice. Anything wrong with using one of those for a utility sink in a garage? Otherwise it will be a 30-40ft pipe up to attic/roof.
Studor will be fine- just be sure it can breath good air, don't conceal it in a stud cavity

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