BritGarnell
New Member
Hi All
I hope everyone had a good holiday. We had an issue arise over Christmas that I would really appreciate some opinions and help on.
We added a new bathroom on our second (top) floor earlier this year. I know for sure the branch stack for that bathroom does not penetrate the roof - they did put an AAV in the wall where the shower is though.
That branch runs straight down to the basement and then runs horizontally in the basement to tie into the original main stack for the house (which has a couple of roof penetrations).
Before the horizontal run hits the main stack the basement ejector pump ties into it.
The problem (discovered over Christmas when we had guests using the bathroom in the basement) is that occasionally when that bathroom (which feeds into the ejector sump) is being used, the toilet in the new upstairs bathroom "explodes" with water shooting everywhere - caused I assume by air trying to find a way out after the ejector pump has run?
The pump plumbing looks reasonable to me with the air in front of the water I would assume being pushed into main stack but an exploding toilet would suggest otherwise!!
Because this issue is happening only when basement plumbing is being used I’m assuming it’s connected to that vs a blockage in main drain etc?
Thoughts on issue here and if anyway to solve for it in the basement vs opening up walls in the new bathroom? E.g. back flow preventer or tie a vent in before ejector pump waste back to main stack?).
All and any thoughts and guidance appreciated!! Thanks!
I hope everyone had a good holiday. We had an issue arise over Christmas that I would really appreciate some opinions and help on.
We added a new bathroom on our second (top) floor earlier this year. I know for sure the branch stack for that bathroom does not penetrate the roof - they did put an AAV in the wall where the shower is though.
That branch runs straight down to the basement and then runs horizontally in the basement to tie into the original main stack for the house (which has a couple of roof penetrations).
Before the horizontal run hits the main stack the basement ejector pump ties into it.
The problem (discovered over Christmas when we had guests using the bathroom in the basement) is that occasionally when that bathroom (which feeds into the ejector sump) is being used, the toilet in the new upstairs bathroom "explodes" with water shooting everywhere - caused I assume by air trying to find a way out after the ejector pump has run?
The pump plumbing looks reasonable to me with the air in front of the water I would assume being pushed into main stack but an exploding toilet would suggest otherwise!!
Because this issue is happening only when basement plumbing is being used I’m assuming it’s connected to that vs a blockage in main drain etc?
Thoughts on issue here and if anyway to solve for it in the basement vs opening up walls in the new bathroom? E.g. back flow preventer or tie a vent in before ejector pump waste back to main stack?).
All and any thoughts and guidance appreciated!! Thanks!
