2nd floor bathroom, when the shower/bath water us turned on, the water in the toilet begins to dance as if it was a very windy day. Shut the water off in the bath and the water in the toilet stops moving. There was no vent pipe located in the attic space in the area of the bathroom. I’m thinking the lack of proper venting is the cause, but thought I’d throw it out there to see what other may think.
1 Like
Does the toilet flush normally?
2 Likes
Flushes just fine, and no sounds or back ups in the tub drain.
1 Like
Does the toilet dance when the vanity is turned on?
This one was a 2nd story vent issue
3 Likes
Seems likely.
3 Likes
Were you able to see the vent termination? I find test caps still installed on occasion and write them up, although I’ve never noticed a problem with drainage with them still in place.
IMO it could be a vent issue, but without seeing the vent configuration in the attic, and with everything draining as it should, I wouldn’t consider it an problem, but just the same, a note it in the report as a CYA should anything problems arise down the road might not be a bad idea.
3 Likes
My wag is venting. Likely second bathroom was installed by a all purpose contractor.
@kleonard There was no vent piping visible near that bathroom in the attic or terminating out of the siding. Nothing, notta, ziltch… The vanity sinks had their own AAVs installed. That’s it…
Yeah I see those too. Makes me laugh each time…
2 Likes
Yeah, plumbers don’t like to get on the roof, they rely on the carpenter to do their work, if the plumber is a dick head I would make him take it off.
4 Likes
Probably vent related. But did the home have at least one main stack vent?
As long as there is at least one 3" vent, then the AAV’s are fine. (at least in my area)
Negative. The master bath and laundry (both 2nd floor) had their own individual vents on the other side of the home. Kitchen island sink on main level had an AAV.
The only other vent in the house was near the furnace in the basement, another AAV sticking out of the concrete floor.
Those AAV’s in the bath are not a substitute for a 3" stack vent for the toilet and tub. Without proper venting the water in the toilet will move due to the pressure of the pipe caused by the tub draining.
8 Likes
And you’d be right…venting issue…
2 Likes
I had a similar issue in my own home. When draining one tub and showering in another bathroom, the toilet would start dancing and bubbling. Found the filter to septic tank clogged with hair. Didn’t even know there was a filter pre tank. Cleaned it and voila! No bubbling.
1 Like
So you had an obstruction…I’ll remember that. I got the old fashioned septic tank with a cement tank so no filter. Do you mind me asking what type of septic system has the filter you’re talking about?
Marcel is surmising that the two AAV’s are the only venting for the whole bathroom. That is my conclusion as well. Those AAV’s are limited in air volume to begin with (e.g. barely adequate for a single sink) and even less so if they become dirty or clogged. There is a reason they are called “cheater vents.”
1 Like
Yeah Ray, I’ve not seen that system either. So, I’d be curious what Kip has on his home.