When we flush the toilet in one washroom of the house, there is alot of
gurgling sound from the bathtub drain in the same washroom. Is this
normal? Never heard it before and this does not happen in other
washrooms in our house. This washroom is on the upper most floor.
No, it's not normal.
A proper "vent" connection is supposed to prevent this
There is quite a good explanation here w/pics:
Is the house new construction? 100 yr old?
Thanks for the replies. So if this is a vent problem, what sort of
labor is required to fix it? And what are the disadvantages of not
Would someone have to go into the wall or simply fix something on the
roof? Sorry, newbie here and any help would be greatly appreciated.
On 21 Jun 2006 12:00:58 -0700, email@example.com wrote:
Bad smells as your toilet can suck the other traps dry letting sewer smells come
Your vent probably exits your roof. Once we had to fashion a long pipe to
vacuum/blow out the stack. It was cheaper than busting down bathroom or bedroom
Autovent or air admittance valves are only used on sinks. There must be a
Easiest thing you can do is stick a hose in the roof vent (or vents) and
flush, it should run directly to the sewer and not backup anywhere in the
house if there is no bad plug. Next would be to snake the vent and drains
or you could just start there.
Anyway should be possible to fix without breaking a wall but figuring out
where the plug is in the hidden piping network does take experience to know
what to expect and where to look for it. A plumber can snake from any
drain, vent or cleanout plug, its just a matter of finding the right one.
Smart move, you may save yourself some money.
The tub in our main bath does the same thing, and we were very
concerned until our plumber (who lives seven doors down) said it's
perfectly fine, it's a side-effect of the way the bathroom pipes are
tied into the main stack. When the toilet flushes, the rush of the
water down the pipes creates suction and what we (or you) hear is the
vacuum in the pipe pulling air through the trap in the tub.
Ah, yes, grasshopper, but in 1952 the plumber(s) who built our
neighborhood evidently didn't believe in such a thing. Thus, the
thundering tub drain, which is especially nice at 3 a.m. when the Wife
gets up to go to the bathroom.
BTW, since we're on this subject, the plumbers installing the piping
for the new bath we're installing in our rental house put the vent
inside the wall, and then cut a hole into the adjacent walk-in closet.
Am I going to get sewer gas smell inside the closet now?
If its a straight down(from the roof to behind the toilet) vent pipe, I'd
tie a large nut on a string and lower it into the vent and see how far down
the obstruction (if any) may be. If its a bird nest, close, I'd try to
PULL it up with my shop vac instead of pushing it down further. If its a
tied together vent system that runs sideways in the attic at any
point...well forget the string theory.
It's not optimal plumbing but if you are not getting bad odors from the
tub drain don't get too concerned. If It's gurgling the trap is still
sealing the sewer gases out if it stinks it ain't.
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