What to do about negative pressure ??

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    • #273814
      MasterPlumbers
      Keymaster

      We think that our house has too much negative pressure causing the water in the toilets (and possibly the sink) to be siphoned out of the traps on windy days. The house is only 10 years old but we believe that the vents to the roof are only 1-1/2 inches wide. What can be done to prevent this from happening and reduce odors?

    • #288592

      Wow 11/2″ vent terminals WHAT State do you live in to allow this kind of garbage plumbing code?

      Never have I ever installed a vent terminal less then 4″ to prevent hoar frost and oscillation effects.

      I would do the following have the vent piping increased just below roof level to 4″ by a plumber who isn’t too CHEAP to use this larger sized piping.

      I hope your plumbing code also has the decency to out law AAV crap or wet venting garbage.

      I am appalled at the caliper of non skilled mongrels now in some apprenticeship programs and the poor home buyers are the real victims of this menace.

      I wish you all the luck in the world as sewer gasses are not good for your health and a trap seal is the only protection to prevent these dangerous fumes from entering your home. Call a licensed plumber to see what they can do.

      Feel free to E mail me with other possibilities available to you
      like installing a FRESH AIR INLET or a double vent running trap on the house main.

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