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Question DetailsAsked on 6/21/2011

Is it normal that the water level in my toilets drops on windy days?

My family lives in a home built in 2004 so I presume the plumbing is well constructed. I have noticed that on very windy days the water level in the toilets seems to drop an inch or more. I also presume this is due to variations of the air pressure in those vant stacks. Is this normal?

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2 Answers

0
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yes this is possible during high winds this tells me you have proper venting some time they go on roof and put on a 45 degree fitting and point it in the opposite way you wind usually blows! May be on zable zuss web site they may make a fitting for high winds.

Answered 6 years ago by owen klaus

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This is very normal - the vent pipe is acting as a venturi and the wind is creating a partial vacuum in your sewer system - just like blowing across the top of a flute or bottle creates a whistle due to the airflow across the opening.

There are a number of vent caps to handle this problem - louvered, downward-angled, and domed - google this search term and your will see images of a number of types you can get at your home supply store, or have a plumber or roofer install -

sewer vent stack cap images

If you live in an area with continuously below-freezing temperatures for more than a day or two at a time, I would get a plastic one, and one with large openings rather than fine louvers, to avoid frosting up, as the vent pipe is constantly emitting moist warm air that can block the vent as it forms frost. In extreme cold conditions, this occurs even with the open full-diameter pipe.

Answered 5 years ago by LCD




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