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Thread: Garbage disposal & drainage

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    DIY Junior Member BKBethesda's Avatar
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    Default Garbage disposal & drainage

    I recently installed a new sink which is deeper than my previous sink. My Badger 5 garbage disposal now sits lower in the base cabinet and the horizontal portion of the drainage line coming out of the garbage disposal is now just about level with the main drainage line coming out of the wall on the other side of the trap. That said, would this cause the water to back up in the disposal? If yes, is there a shorter drainage flange available to lift the disposal closer to the sink? How much higher should the drainage line coming off the disposal be than the main drainage line coming out of the wall? Thanks in advance...

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Neither the arm coming out of the disposal nor the one out of the trap to the wall can go uphill...they should have a negative, or downhill slope. If either has a positive (or uphill) slope, you need to move the connection in the wall to be lower so they can go downhill.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    DIY Junior Member BKBethesda's Avatar
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    Thanks for the response. The drainage line coming out of the wall has a slight slope towards the wall (1/8 tilt). I assuming in the grand scheme of the slope, the drainage line from the disposal has to be higher than plumb with the drainage line from the wall? Also, the line coming from the wall is immovable (high rise condo building). Do you have any other suggestions? If I could just get the flange that holds the disposal 1/2 inch closer to the sink I think this would reslove my problem.

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    Moderator & Master Plumber hj's Avatar
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    Default drain

    There is only ONE drain connection flange, so that is not an option. We would need a picture of the sink's drain lines to tell if there is an easy solution to your problem.
    Licensed residential and commercial plumber

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    Forum Admin, Expert Plumber Terry's Avatar
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    Many times with a deeper sink, the drain at the wall will need to be lowered.
    Sometimes as much as 3"

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    DIY Junior Member BKBethesda's Avatar
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    Quote Originally Posted by hj View Post
    There is only ONE drain connection flange, so that is not an option. We would need a picture of the sink's drain lines to tell if there is an easy solution to your problem.
    Ok, thanks, I will post a pic in a.m. Much appreciated.

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    DIY Junior Member BKBethesda's Avatar
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    Quote Originally Posted by Terry View Post
    Many times with a deeper sink, the drain at the wall will need to be lowered.
    Sometimes as much as 3"
    I wish I could but the drain line extends from a chase that the high rise condo building assoc told me I could not touch.

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    Moderator & Master Plumber hj's Avatar
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    quote; wish I could but the drain line extends from a chase that the high rise condo building assoc told me I could not touch.

    That is a common restriction, and even if you could "touch it" there is a good chance it would affect one or more of the other units. Plus, the chase is probably a "fire rated" structure that would be compromised if you worked on it.
    Licensed residential and commercial plumber

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    Retired Defense Industry Engineer jadnashua's Avatar
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    If you can't lower the connection in the wall, you may need to find a shallower sink. Pictures would definately help identify possibilities.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    DIY Junior Member BKBethesda's Avatar
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    Okay, having trouble uploading pics (Web site error). Will work on trying to upload via URL. Terry, I can email you the pics if you, as administrator, can upload them.

    Sure, I can upload them
    The pictures need to be 800 pixels or less. I resize them with a photo editing program.
    Last edited by Terry; 10-05-2011 at 07:21 AM. Reason: pic upload failure

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    DIY Junior Member BKBethesda's Avatar
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    Quote Originally Posted by BKBethesda View Post
    Okay, having trouble uploading pics (Web site error). Will work on trying to upload via URL. Terry, I can email you the pics if you, as administrator, can upload them.
    Quote Originally Posted by hj View Post
    quote; wish I could but the drain line extends from a chase that the high rise condo building assoc told me I could not touch.

    That is a common restriction, and even if you could "touch it" there is a good chance it would affect one or more of the other units. Plus, the chase is probably a "fire rated" structure that would be compromised if you worked on it.
    Ok, not sure if my pic was 800 pixels or not so I made the pic my avatar. as you can see the black drain line coming out of the disposal is slightly higher than the main drain line (on the right) going into the wall. I'm guessing that the differential is not enough to drain properly? Ignore that my "helper" ran the faucet flex line under the drain pipe, I will have to reset that : ).
    Last edited by BKBethesda; 10-05-2011 at 09:23 AM. Reason: add recipient

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    DIY Junior Member BKBethesda's Avatar
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    Quote Originally Posted by Terry View Post
    Many times with a deeper sink, the drain at the wall will need to be lowered.
    Sometimes as much as 3"
    Ok, not sure if my pic was 800 pixels or not so I made the pic my avatar. as you can see the black drain line coming out of the disposal is slightly higher than the main drain line (on the right) going into the wall. I'm guessing that the differential is not enough to drain properly? Also, ignore the fact that my "helper" ran the hose under the drain, I will reset that

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    DIY Junior Member BKBethesda's Avatar
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    Terry,
    I uploaded the picture as my avatar so to show the board the configuration. See my post above for a more detailed explanation. Thanks

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    Test, Don't Guess! cacher_chick's Avatar
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    Posting the same info several times won't help. We will need to see one good picture of all the drain piping, or even better, 2-3 pictures from different angles.

    From what we can see, you will need to switch to a sink that is not as deep.

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    DIY Junior Member BKBethesda's Avatar
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    Thanks for the reply and apologies for the multiple posts, I had trouble trying to respond to multiple forum participants. I asked the site moderator to upload my photos so I'll get back to you once they are available. Unfortunately, the sink sits between the sink base cabinet and a granite counter so I don't think that is an option. The current measurement from the bottom of my sink to the middle of the garbage disposal drain pipe is 7 inches. That said, I think there are some other disposals out there that have a less than 6 inch length for the same measurement that I will look into. I think that is my only option other than taking the disposal out of the equation alltogether.

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