1st story lav sink drains slow, 2nd story lav trap gets sucked dry: help?

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mystryda

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I inherited a pair of problem sinks, and I haven't been able to solve the problem.

House was built in the late 70's. These two bathrooms are on the same stack, and I'm guessing that the problems are related.

The 1st story lav sink drains very slowly. The trap is completely clean.

The 2nd story lav sink drains fine, but the flushing the toilet releases a bit of sewer gas. I'm presuming that the trap is getting sucked dry because of a clogged vent. I tried blowing out the clog by feeding a garden hose down the vent from the roof, but that didn't seem to make a difference.

Do you think these problems are related? What should I do next?
 

Reach4

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1. When you say the downstairs trap is completely clean, are you basing that on being able to shove a 1/4 inch snake through the pipes, or did you remove the trap and inspect?

2.
Is the "trap seal" a bit shallow upstairs?
trap-bw-2d.jpg
If your trap is at the shallow end, maybe you could find a deeper P trap.

Not a plumber.
 

mystryda

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I actually pulled the trap. It's completely clean.

I would estimate the trap seal depth as ~2 1/2". It's a typical 1 1/4" lav P-trap kit.
 
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