We've lived in our 90-year-old home for 4 years. We have a basement
bathroom with shower, toilet, sink. The bathroom is on an 18-inch
platform.

Last New Years Eve, water flooded the basement from underneath the
bathroom, probably 20-30 gallons. We suctioned it out, no further
problem. A few weeks later, it did it again. A few weeks later,
again. At this point we called plumbers out to take a look, and they
could find nothing wrong, and had no explanation for what was
happening.

A few points:

1) The water is cold, not hot. My first thought was the water heater
(which is also in the basement, in another area) had spilled, but
that's not it.
2) The water is clean. There is no smell or debris in the water. (No
toilet overflowing, etc.)
3) It floods all at once. We checked for some kind of leak that might
be building up, but there was none.
4) The flooding happens at night (or very very early morning), so the
water is not in use at the time it floods.
5) The flooding is irregular; that is, we can't predict when it's going
to happen.
6) We had not had the problem for 3 1/2 years....why did it start now?
No construction or anything like that going on.

We need some advice on how to stop this flooding; it stumped our two
plumbers (who seemed competent in all other ways.) Thanks for any
help.

Buy a flood alarm and put on floor where flooding occurs. This way you can
watch when it happens again.

"wordkyle" wrote in message
oups.com...
We've lived in our 90-year-old home for 4 years. We have a basement
bathroom with shower, toilet, sink. The bathroom is on an 18-inch
platform.

Last New Years Eve, water flooded the basement from underneath the
bathroom, probably 20-30 gallons. We suctioned it out, no further
problem. A few weeks later, it did it again. A few weeks later,
again. At this point we called plumbers out to take a look, and they
could find nothing wrong, and had no explanation for what was
happening.

A few points:

1) The water is cold, not hot. My first thought was the water heater
(which is also in the basement, in another area) had spilled, but
that's not it.
2) The water is clean. There is no smell or debris in the water. (No
toilet overflowing, etc.)
3) It floods all at once. We checked for some kind of leak that might
be building up, but there was none.
4) The flooding happens at night (or very very early morning), so the
water is not in use at the time it floods.
5) The flooding is irregular; that is, we can't predict when it's going
to happen.
6) We had not had the problem for 3 1/2 years....why did it start now?
No construction or anything like that going on.

We need some advice on how to stop this flooding; it stumped our two
plumbers (who seemed competent in all other ways.) Thanks for any
help.

wordkyle wrote:
We've lived in our 90-year-old home for 4 years. We have a basement
bathroom with shower, toilet, sink. The bathroom is on an 18-inch
platform.

Last New Years Eve, water flooded the basement from underneath the
bathroom, probably 20-30 gallons. We suctioned it out, no further
problem. A few weeks later, it did it again. A few weeks later,
again. At this point we called plumbers out to take a look, and they
could find nothing wrong, and had no explanation for what was
happening.

A few points:

1) The water is cold, not hot. My first thought was the water heater
(which is also in the basement, in another area) had spilled, but
that's not it.
2) The water is clean. There is no smell or debris in the water. (No
toilet overflowing, etc.)
3) It floods all at once. We checked for some kind of leak that might
be building up, but there was none.
4) The flooding happens at night (or very very early morning), so the
water is not in use at the time it floods.
5) The flooding is irregular; that is, we can't predict when it's going
to happen.
6) We had not had the problem for 3 1/2 years....why did it start now?
No construction or anything like that going on.

We need some advice on how to stop this flooding; it stumped our two
plumbers (who seemed competent in all other ways.) Thanks for any
help.

Get a chlorine test kit and the next time it floods check the water for
Cl. if it extremely low compared to normal tap water the source is
most likely condensation or maybe rain. In my case it was condensation.
Not as big a problem as yours but big enough. The water would suddenly
come out from aound a pipe in the ceiling of the garage which was under
the house. Old vinyl floori covering was creating a kind of valve that
would allow the water to build up then suddenly empty. toilet and
shower were on a platform. I guess this was so you could get the car in
the garage. Problem was cured when bathroom was overhauled and garage
was dug lower. The platform was removed and the plumbing was run in the
garage. Rguardless of what is wrong you will probably have to rip out
at least part of the platform to fix it.

Sounds like a pressure relief valve letting go. There is one on the
water heater and may be others in your system.

Look for where it drains.



On 12 Jul 2006 17:42:57 -0700, "wordkyle" wrote:

We've lived in our 90-year-old home for 4 years. We have a basement
bathroom with shower, toilet, sink. The bathroom is on an 18-inch
platform.

Last New Years Eve, water flooded the basement from underneath the
bathroom, probably 20-30 gallons. We suctioned it out, no further
problem. A few weeks later, it did it again. A few weeks later,
again. At this point we called plumbers out to take a look, and they
could find nothing wrong, and had no explanation for what was
happening.

A few points:

1) The water is cold, not hot. My first thought was the water heater
(which is also in the basement, in another area) had spilled, but
that's not it.
2) The water is clean. There is no smell or debris in the water. (No
toilet overflowing, etc.)
3) It floods all at once. We checked for some kind of leak that might
be building up, but there was none.
4) The flooding happens at night (or very very early morning), so the
water is not in use at the time it floods.
5) The flooding is irregular; that is, we can't predict when it's going
to happen.
6) We had not had the problem for 3 1/2 years....why did it start now?
No construction or anything like that going on.

We need some advice on how to stop this flooding; it stumped our two
plumbers (who seemed competent in all other ways.) Thanks for any
help.

That is a real mystery. Any chance the city main sewer is clogged or
overflowing occasionally and backs up your toilet? We had a sewer
problem that showed up in our condo first because we are the closest to
the city main sewer line. Both toilets began backing up and initially
there was sewage in the puddle but then it seemed cleaner. First thing
I did was to ask other neighbors if they had problems, and initially
they said no, but everything was coming into our unit so they didn't see
any backup. Then I called the city (Sunday evening) to see if there
were problems downline. Nope. Then we got a plumber to ream out all
the way to the city main, about 300'. Nothing of note pulled out.
About a week later, the city was excavating right where the sewer line
from the condo joins the city's main sewer line. There are also pumping
stations for sewage on the city side to get it from here to town.

Maybe you just have a bad seal and if the city's lines are overloaded
you get some back pressure occasionally?

Perhaps what you are seeing is the result of a sump pump with a deteriorated
out put hose. The reason it doesn't happen all the time is that the pump
would only come on when the water in the sump reached a certain level. This
might also account for the 20-30 gallons, as most sumps that I have seen are
not much larger than a small trashcan (32 gallon).



Interesting problem. Please keep the group informed.

..


"wordkyle" wrote in message
oups.com...
We've lived in our 90-year-old home for 4 years. We have a basement
bathroom with shower, toilet, sink. The bathroom is on an 18-inch
platform.

Last New Years Eve, water flooded the basement from underneath the
bathroom, probably 20-30 gallons. We suctioned it out, no further
problem. A few weeks later, it did it again. A few weeks later,
again. At this point we called plumbers out to take a look, and they
could find nothing wrong, and had no explanation for what was
happening.

A few points:

1) The water is cold, not hot. My first thought was the water heater
(which is also in the basement, in another area) had spilled, but
that's not it.
2) The water is clean. There is no smell or debris in the water. (No
toilet overflowing, etc.)
3) It floods all at once. We checked for some kind of leak that might
be building up, but there was none.
4) The flooding happens at night (or very very early morning), so the
water is not in use at the time it floods.
5) The flooding is irregular; that is, we can't predict when it's going
to happen.
6) We had not had the problem for 3 1/2 years....why did it start now?
No construction or anything like that going on.

We need some advice on how to stop this flooding; it stumped our two
plumbers (who seemed competent in all other ways.) Thanks for any
help.