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Author:
codykodes (TX)
Specs: I have a new install (DIY) double vanity, all new plumbing up to stack. 1/4" per ft slope. The stack is on a perpendicular wall from the double vanity stub outs. The 1-1/2" line travels about three feet from the stack, makes a 90 (quarter bend), travels 16 inches, stubs out with a sanitary wye, and the second line runs 29-1/2" and stubs out as a 90 (quarter bend). 1-1/4" P-traps installed. Sinks are using grid/strainer type drains, and both Kohler undermount sinks have overflows built in.
Symptoms: The left side will drain slow while the right side chugs along. At one point, it managed to alternate symptoms, though I haven't yet duplicated it again. You flush the toilet, and get maybe a little agitation, but not necessarily gurgling. It does however seem like the flush power of the toilet is affected by running the sinks and having the slow drainage. Once the sinks have drained, you get a strong normal flush. The drain stack runs out the roof, straight up (bottom floor master bath, two story house).
Diagnosis suggestions?
I have contemplated if I need to install something like a loop vent on the stubouts because of the distance from the stack, or an AAV (not preferred), or if a worst diagnosis could exist like a sewage break under the slab down stream would cause vent symptom-like issues... Not a pro, so without the years of experience, I'm not 100% sure.
Help and ideas appreciated.
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Author:
packy (MA)
i think the grid strainers are the problem..
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Author:
codykodes (TX)
Realizing now the strainer I got is without overflow. Gonna have to order two of em online, will update if it fixes the issue.
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Author:
holland123 (MI)
Agreed, have seen weird stuff with grid strainers
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Author:
srloren (CA)
If not the strainers I would look at the vent and length of the trap arm also the 90s need to be at least medium turn or long turn 90s for ease of flow. Remember you do not have a lot of head pressure on these drains so water will tend to move slowly down the drain. Over flows provide need venting to help flow so make sure when you install the tailepiece that you don't use excessive putty which will tend to block the overflow/vent from properly working.
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