periodically we experience a foul smell in the bathroom (not just after
a recent visit!)
I suspect the soil connection to the wc pan
the current connection appears to be clay (?) wrapped in some kind of
bandage which dissappears horizontally into the wall.
The exterior stack is cast iron.
the clay pipe is obviously very old and does not even have a circular
cross section any more (but there are no signs of a leak this side of
the wall)
Would a new plastic pipe with rubber flange simply push-fit into the
cleaned-up cast iron?
Could the smell be caused by a blockage in the top of the soil stack
(birds nest etc)?

The house is a two storey stone building of 100+ years

Many thanks,
Ian
Perthshire

ianw wrote:
periodically we experience a foul smell in the bathroom (not just after
a recent visit!)
I suspect the soil connection to the wc pan
the current connection appears to be clay (?) wrapped in some kind of
bandage which dissappears horizontally into the wall.
The exterior stack is cast iron.
the clay pipe is obviously very old and does not even have a circular
cross section any more (but there are no signs of a leak this side of
the wall)
Would a new plastic pipe with rubber flange simply push-fit into the
cleaned-up cast iron?
Could the smell be caused by a blockage in the top of the soil stack
(birds nest etc)?

The house is a two storey stone building of 100+ years

What is the level of the vent?

On an old property too, there may be an open junction just outside the
loo where other plumbagoes.

Perhaps a picture of the outside with the offensive window exed would
help. If it is odour coming from the top of the stack, the weather is
likely to be similar in all cases where the niff comes in.

If it was a leaking joint then the stink would be deadly and permanent
and you'd soon notice where it was.

On 23 Jul 2006 01:45:10 -0700, "ianw" wrote:

periodically we experience a foul smell in the bathroom (not just after
a recent visit!)
I suspect the soil connection to the wc pan
the current connection appears to be clay (?) wrapped in some kind of
bandage which dissappears horizontally into the wall.
The exterior stack is cast iron.
the clay pipe is obviously very old and does not even have a circular
cross section any more (but there are no signs of a leak this side of
the wall)
Would a new plastic pipe with rubber flange simply push-fit into the
cleaned-up cast iron?
Could the smell be caused by a blockage in the top of the soil stack
(birds nest etc)?

The house is a two storey stone building of 100+ years

Many thanks,
Ian
Perthshire

--
Email (ROT13)

In article .com,
ianw wrote:
periodically we experience a foul smell in the bathroom (not just after
a recent visit!) I suspect the soil connection to the wc pan the current
connection appears to be clay (?) wrapped in some kind of bandage which
dissappears horizontally into the wall. The exterior stack is cast iron.
the clay pipe is obviously very old and does not even have a circular
cross section any more (but there are no signs of a leak this side of
the wall) Would a new plastic pipe with rubber flange simply push-fit
into the cleaned-up cast iron? Could the smell be caused by a blockage
in the top of the soil stack (birds nest etc)?

Does anything else like a basin or bath go into the same stack? If so the
water in the trap in these can dry out this weather and allow smells
through.

--
*Why is it that doctors call what they do "practice"?

Dave Plowman London SW
To e-mail, change noise into sound.

ianw wrote:
periodically we experience a foul smell in the bathroom (not just after
a recent visit!)
I suspect the soil connection to the wc pan
the current connection appears to be clay (?) wrapped in some kind of
bandage which dissappears horizontally into the wall.
The exterior stack is cast iron.
the clay pipe is obviously very old and does not even have a circular
cross section any more (but there are no signs of a leak this side of
the wall)
Would a new plastic pipe with rubber flange simply push-fit into the
cleaned-up cast iron?
Could the smell be caused by a blockage in the top of the soil stack
(birds nest etc)?

The house is a two storey stone building of 100+ years

Many thanks,
Ian
Perthshire

I suspect that one or more U-bend traps is being sucked dry. Possibly in
periods of high wind.

Sniff at the plugholes next time it happens

It could be simply bad design or a blocked vent.

It may be possible to install a Durgo type air admittance valve into the
pipework if it is bad design.

Thanks for the posts.

After reading your comments I had another look at the layout:
The top of the soil stack is about 3m above the wc connection however
about 18 months ago I fitted an extractor fan. Due to coombed ceilings
I chose a 12V model about 1.6m from floor level above the wc. However
this is only approx 1.5m from the head of the stack.
The date of installation roughly corresponds with the appearance of the
pong.
Our shower is over bath so, along with the presence of a teenage
daughter, there is little chance of traps being dry.
I will disable the fan, seal with cling film for a few weeks and see if
the smell returns.
Thanks again,
Ian

ianw wrote:
Thanks for the posts.

After reading your comments I had another look at the layout:
The top of the soil stack is about 3m above the wc connection however
about 18 months ago I fitted an extractor fan. Due to coombed ceilings
I chose a 12V model about 1.6m from floor level above the wc. However
this is only approx 1.5m from the head of the stack.
The date of installation roughly corresponds with the appearance of the
pong.
Our shower is over bath so, along with the presence of a teenage
daughter, there is little chance of traps being dry.
I will disable the fan, seal with cling film for a few weeks and see if
the smell returns.
Thanks again,
Ian

That makes sense.

You can fit a fan with electrically operated shutters, or add a bit to
the soil vent top.

Or arrange the vent to be further away..its only there to prevent
pressure/vacuum build up so it can be pushed horizontally in the loft
for miles..mine is..