Bath Sink Drain "Burps" Occasionally

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Old 05-05-16, 02:18 PM
J
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Bath Sink Drain "Burps" Occasionally

My bath sink vanity generally drains pretty fast (say 4 our of 5 times), but occasionally water will accumulate in the sink, followed by a few big "burps" of bubbles. So, I took apart the trap (PVC slip joint style), and removed a few minor globs of the usual "grey goo", and sloped the waste arm downward (it was going slightly uphill, rather than downhill). I thought doing that might cure the problem, but it didn't. Anyone experienced this before? I'm wondering if maybe its a clogged vent issue, but I thought I would run it through the forum before getting on the roof and sticking my snake down the vent pipe. Thanks in advance.
 
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Old 05-05-16, 04:57 PM
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No one here is going to know how your home was plumbed, how old the home is, without more info.
New to you home?
New issue?
 
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Old 05-05-16, 05:50 PM
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I don't know about a burp. A gurgle indicates clogged main drain.

If your house has cast iron pipes, changing out the san tees to ABS will make water flow much better. The cast iron tees have a sharp drop off that collects build up over time and will remain a problem.
 
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