07:31PM | 06/10/07
Member Since: 06/09/07
2 lifetime posts
Long story; water in bowl was slowly going down about 1 1/2 inches. Put in new toilet - same thing happened. Am in garden condo situation, middle of 3 floors. When toilet upstairs is flushed, water in my bowl sways and water level decreases about another 1/4 inch. My toilet has been snaked, the roof vent has been snaked, only difference is water level goes down 1 1/2 inches right away. Any ideas? Two plumbers and drain expert are at a loss. Trustees say next step may be to take down my wall!!! Upstairs and downstairs neighbors say they have no problems!??


09:31AM | 06/11/07
Member Since: 01/24/06
1455 lifetime posts
This condition in the stack is created by the discharge of waste from a fixture on an upper floor, causes a small part of the water in a fix­ture trap on a lower floor to be discharged into the stack. Sufficient water remains in the lower fixture trap to fill the outer leg and the lowest portion of the trap when siphoning conditions exist subsequently, this is called negative pressure where the trap seal is pulled out of the traps being serviced

There is another condition called oscillation which is caused by a down draft (wind effect) as the vent terminal allows air to be pulled down this vent in draws out the trap seals of fixtures.

Even though the trap seal is reduced as long as it covers the trap crown weir you should not experience any foul odors.

This is a very common problem on high rise buildings and where a vent terminal is under 4" and where no provisions were allowed for a Fresh Air Inlet (FAI)

One of the easiest ways to rectify this phenomena is to make sure the vent terminal is clear and a four (4") VTR is properly installed or placing a return bend a 180 degree fitting on the vent terminal that will stop down drafts or debris going down this VT.

Josam item number 26700 like other manufacturers have what is known as a Vandal proof vent terminal cap that will prevent down drafts and will not promote hoarfrost, yet allow the free movement of foul air to be discharged

This is another reason I'm totally against any mechanical devices placed on a plumbing vent system like AAV's

I hope the installing plumbers did install a four (4") main vent undiminished in size through the roof and did not use wet venting and installed individual vents for each fixture.


12:00PM | 06/12/07
Member Since: 06/09/07
2 lifetime posts
Thank you for your reply. I am passing it on to the trustees. I have to say a lot of it was over my head, but I will keep a copy for my plumber. However, if the trustees decide to go on with this, it is their plumber who will be hired, not mine.


08:44AM | 06/13/07
Member Since: 01/24/06
1455 lifetime posts
There are "plumbers" and then there are genuine plumbers who do hold a masters license and have the training background to back it up.

Just ask to see their master plumbing license and of course a certificate of insurance.

Feel free to contact me any time


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