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Vent pipe

I have 3 bathrooms on 3 levels that use the same roof vent pipe. The pipe osolates and makes a high pitch hum. This hum is accompanied by a gurgling in the lower level toilet. The hum starts by itself or when someone uses one of the toilets on the stack. Any ideas?

Re: Vent pipe

Either a partial or complete blocking of the vent. Get on the roof with a snake and look for the problem. Also secure the pipe, especially at the roof jack.

Re: Vent pipe

If you have a clean out servicing this line, run a snake there too.

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