Mizzat
Will post for thumbs
Premium
join:2003-05-03
Atlanta, GA
 ·AT&T Southeast
1 edit | Garbage Disposal and Dishwasher
Hi all,
I have a dishwasher currently and want to install a garbage disposal. In reading about the GD, I found that it is common practice to connect the dishwasher to the GD. However, what I can't find is what the benefits and risks are of doing this. Trying to search codes for GA and I haven't found anything yet about this being a requirement, as well as if having an air stop gap as well.
My thoughts: The hot water and and leftover food particles can be good to go through the disposal rather than clog the drain and in either case an air stop gap is probably a good idea.
Any other benefits or risks you all know or can think of and recommendations?
Thanks!
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-M |
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PrntRhd
join:2004-11-03
Fairfield, CA
 ·Comcast
·Comcast Formerly ..
1 edit | Re: Garbade Disposal and Dishwasher
Just had my dishwasher replaced and the disposer replaced this year as well.
The dishwasher air gap device is required out here, I learned how to clean it when installed, they can clog with food particles and will start flooding the top of the sink if clogged.
The disposer had a knockout fitting to install the hose from the dishwasher. It is quieter and puts less humidity into the room than running the discharge into the sink, also will not discolor (unevenly bleach areas of) the sink with chlorinated dishwasher solution. You really do not want the ripe discharge in the main drain or hose to get back into the dishwasher and get the dishes contaminated or the dishwasher to stink so it is a good idea to install the air gap.
I just had an old Waste King disposer (rusted through the grinding impeller disk) replaced with a Insinkerator Evolution Compact model. 3/4 HP and quiet, w quick release if it needs to be replaced in the future. Stainless steel grinding components. |
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tahoejeff
join:2001-07-01
Wisconsin Dells, WI
clubs:
1 edit | reply to Mizzat
I just installed a dishwasher last spring. I forget now if it was the install instructions or the internet...but I ended up just tacking the drain line to a point higher than the disposal inlet under the sink. I used a cable clamp to tack the flexible hose on the underside of the countertop.
Hoping for comments from our resident experts on this easy method.
edit: This method is meant to replace installing an air stop gap.
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The Geek Shall Inherit the Earth |
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Ken
Premium,MVM
join:2003-06-16
Brownsburg, IN
| reply to Mizzat
Most people attach the dishwasher to the garbage disposal because it helps keep the garbage disposal clean, and it's just easier to hook it up that way. I'm not aware of anywhere that code requires the dishwasher to be connected to the garbage disposal in this fashion, it's just personal preference.
On the other hand some areas of the country do have local codes that require the dishwasher to have a sink mounted air gap. In other areas code does not require this as long as you loop the drain line up high in the cabinet. |
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Mizzat
Will post for thumbs
Premium
join:2003-05-03
Atlanta, GA
·AT&T Southeast
| reply to PrntRhd
said by PrntRhd  :Just had my dishwasher replaced and the disposer replaced this year as well. The dishwasher air gap device is required out here, I learned how to clean it when installed, they can clog with food particles and will start flooding the top of the sink if clogged. The disposer had a knockout fitting to install the hose from the dishwasher. It is quieter and puts less humidity into the room than running the discharge into the sink, also will not discolor (unevenly bleach areas of) the sink with chlorinated dishwasher solution. You really do not want the ripe discharge in the main drain or hose to get back into the dishwasher and get the dishes contaminated or the dishwasher to stink so it is a good idea to install the air gap. I just had an old Waste King disposer (rusted through the grinding impeller disk) replaced with a Insinkerator Evolution Compact model. 3/4 HP and quiet, w quick release if it needs to be replaced in the future. Stainless steel grinding components. I was probably going to get the Insinkerator Evolution Excel or Essential, their highest lines, as I need something quite because I have a great room that is one large room with cathedral ceiling that encompasses the living room, dining room and kitchen.
I'm more asking of why it needs to be connected to the dishwasher and what is the benefit of it? I think Ken helped answer part of that by letting us know it helps keep the GD clean, that's good to know!
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-M |
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StepR
Code Warrior
join:2000-11-06
Elgin, IL | reply to Mizzat
Connecting the garbage disposal also saves installing the custom Y-fitting to the other sink's drain. |
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tp0d
yabbazooie
Premium
join:2001-02-13
Carnegie, PA
clubs:
 ·Verizon FIOS
| If you already have a dishwasher, chances are you wont have to modify the drain setup. It all depends on how it was installed initially. It is not required to drain a dishwasher into a disposal. It can be drained into a trap, as long as it is done properly.
Its possible you have one of these installed:
»www.terrylove.com/forums/attachm···47584349
minus the tee to the left though.
If you have one of those, you just disconnect it, and reconnect to the disposal, done.
Be forwarned if you dont currently have a disposal, its quite possible you may need some repiping under the sink (drainage), as the disposal will change the center and height of the trap.
good luck
-j
--
if it aint broke, tweak it!!
currently on FiOS (kick aZZ!) |
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Mizzat
Will post for thumbs
Premium
join:2003-05-03
Atlanta, GA
·AT&T Southeast
1 edit | reply to Mizzat
This is my current setup. Disposal would probably go on right right sink
Edit: to clarify the connections on the left side wall are to and from the dishwasher.
Under the sink
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-M |
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robbin
Premium,MVM
join:2000-09-21
Leander, TX
| I've never seen one installed so that it connects before the trap. I would question whether that would pass code. I don't believe that you can install an air gap on the current installation as it would vent sewer gas into the living space.
I believe that the International Plumbing code requires the air gap if you care about such. |
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Mizzat
Will post for thumbs
Premium
join:2003-05-03
Atlanta, GA
·AT&T Southeast
| said by robbin :I've never seen one installed so that it connects before the trap. I would question whether that would pass code. I don't believe that you can install an air gap on the current installation as it would vent sewer gas into the living space. I believe that the International Plumbing code requires the air gap if you care about such. Can you please clarify what you're talking about? Never seen a dishwasher installed before the trap? In my case its installed after the trap.
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-M |
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robbin
Premium,MVM
join:2000-09-21
Leander, TX
| Normally a dishwasher is plumbed into the disposal or into one of the sink drain pipes ABOVE the sink trap. In other words, the dishwasher drain line is open to air in the sink plumbing. Your installation has the dishwasher plumbed directly in the sewer line where sewer gas is present (there is no trap between the dishwasher and the waste line). |
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Mizzat
Will post for thumbs
Premium
join:2003-05-03
Atlanta, GA
·AT&T Southeast
2 edits | said by robbin :Normally a dishwasher is plumbed into the disposal or into one of the sink drain pipes ABOVE the sink trap. In other words, the dishwasher drain line is open to air in the sink plumbing. Your installation has the dishwasher plumbed directly in the sewer line where sewer gas is present (there is no trap between the dishwasher and the waste line). Yea, the guy that did the plumbing did a horrible job. That is a good point, I guess another reason in my case to do the dishwasher line into the disposal. I'll need to find a cap for that Y side once I disconnect it. Thanks!
Another thing that you might notice is a T with a valve on the right (cold) water. That was originally the water supplied to the dishwasher when I moved in. I bought a T and installed it on the hot water side, as well as new braided hoses as the old ones were plastic, but new, and were already leaking.
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-M |
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Ken
Premium,MVM
join:2003-06-16
Brownsburg, IN
3 edits | reply to robbin
Good catch, I didn't even pay attention to that picture. After looking at the picture further I see several things wrong.
#1 Dishwasher is installed below trap, not above. This allows sewer gas into the dishwasher.
#2 Elbow is a vent elbow and not a proper drain elbow. More likely to clog, and much harder to run a snake through.
#3 Those accordian style pipes are notorious for blockages and should not be used.
#4 The Tee used is not the proper type, it allows water to flow across to the other side and not down. You also can't run a snake down through them.
I would just cut the 1.5" pipe as it comes up out of the bottom of the cabinet and rework the whole setup. |
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tp0d
yabbazooie
Premium
join:2001-02-13
Carnegie, PA
clubs:
·Verizon FIOS
1 edit | reply to Mizzat
That install for the dishwasher is illegal. If you would ever have a clog in the pipe under the floor, it would back up into the dishwasher first. Also, if you didnt use the dishwasher for a long time (some folks dont use em), and the water in the built-in trap for the dishwasher dried up, you would get sewer gas thru your dishwasher.
what you need is a dedicated trap for your dishwasher, like this:
»www.nachi.org/forum/attachments/···gram.gif
The air break is acceptable.
If you put in the disposal, you can attach the dishwasher directly into that, and use that wye as a cleanout. Be sure to put a plug in it.
if your plumber put in a tee for the dishwasher on the cold, he really is a dumbass.
-j
--
if it aint broke, tweak it!!
currently on FiOS (kick aZZ!) |
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averagedude
join:2002-01-30
Mesa, AZ
·Cox HSI
1 edit | reply to Mizzat
air gap | 
just wrong |
The way you have is plumbed in the picture is going to get someone seriously sick or worse. For goodnes sake do not use the dishwasher until the drain is corrected. |
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tp0d
yabbazooie
Premium
join:2001-02-13
Carnegie, PA
clubs:
·Verizon FIOS
| lol dont spread the FUD like that averagedude.
Sure its a bad install, but its probably been working just fine for quite a while, and, if the things I described above dont happen, it could work like that forever.
As for anyone getting sick, thats a long shot. He would notice a backup in the dishwasher before loading it, should that occur.
I`ve only seen one air gap installed like that, ever.. and our code here is pretty strict.
-j
--
if it aint broke, tweak it!!
currently on FiOS (kick aZZ!) |
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tp0d
yabbazooie
Premium
join:2001-02-13
Carnegie, PA
clubs:
·Verizon FIOS
1 edit | Dude....
I just slapped my forehead..
your plumber really is a dumbass...
He didnt vent the trap. Techincally you have an S trap here, and dropping a bowl full of water could siphon the trap. jesus I cant believe I missed that.
When you do your disposer install, you need to call a licensed plumber, and have him properly repipe the install. You can install a V200 vent under the sink, (if its legal in your area), instead of breaking into the wall.
damn, i need sleep... sigh..
-j
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if it aint broke, tweak it!!
currently on FiOS (kick aZZ!) |
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Mizzat
Will post for thumbs
Premium
join:2003-05-03
Atlanta, GA
·AT&T Southeast
| reply to Mizzat
Re: Garbage Disposal and Dishwasher
I'm not installing an air gap that requires me to drill a hole in my granite counter top, sorry. And Can you clarify for me tp0d ? I'm not real familiar with plumbing I build telecom networks for a living, not plumbing networks - haha!
Not sure what you're talking about with the V200, tried to Google it and didn't get very far.
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-M |
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Langning
Premium
join:2003-04-28
Marlborough, MA
·Verizon FIOS
| said by Mizzat :I'm not installing an air gap that requires me to drill a hole in my granite counter top, sorry. You don't have to have an air vent. Either way is OK. |
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Mizzat
Will post for thumbs
Premium
join:2003-05-03
Atlanta, GA
·AT&T Southeast
| said by Langning :said by Mizzat :I'm not installing an air gap that requires me to drill a hole in my granite counter top, sorry. You don't have to have an air vent. Either way is OK. Thanks, I just got done looking at my dishwasher install manual and it basically had the same thing mentioned, its fairy new, so I would think it has something to prevent back flow.
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-M |
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