My 1988 house has the C/H pipes behind the plasterboard. I have a concern
that one radiator is not getting hot and have discovered a restricted flow
from one of the pipes. (8mm)

If I need a pipe replacing when I have a new boiler how easy is it to have a
strip of PB removed and then replaced over one of the drops from the
ceiling? Somehow it doesn't seem right just to cover with plaster.

John wrote:
My 1988 house has the C/H pipes behind the plasterboard. I have a concern
that one radiator is not getting hot and have discovered a restricted flow
from one of the pipes. (8mm)

If I need a pipe replacing when I have a new boiler how easy is it to have a
strip of PB removed and then replaced over one of the drops from the
ceiling? Somehow it doesn't seem right just to cover with plaster.

The simple answer is that in principle it'd straightforward enough to
do; from the wording of your query it doesn't sound like you'd be
diy'ing it?

Dependinf what needs replacing and exactly where it is, you might get
well away with removing and repairing patches, rather than a whole
'strip', ie poking the new pipe through as required.

However, are you sure this is actually necessary? Why do you think the
flow in this pipe is 'restricted'? Even if it is, unblocking it is
probably the way forward.

David

In message , John
writes
My 1988 house has the C/H pipes behind the plasterboard. I have a concern
that one radiator is not getting hot and have discovered a restricted flow
from one of the pipes. (8mm)

Check the TRV before engaging in major surgery. I have two *sticky* ones
in a 15 year old installation. Top unscrews to reveal a small plunger.
One day, I am going to ask in here if any sort of lubrication is likely
to help:-)

regards

--
Tim Lamb

"Tim Lamb" wrote in message
...
In message , John
writes
My 1988 house has the C/H pipes behind the plasterboard. I have a concern
that one radiator is not getting hot and have discovered a restricted flow
from one of the pipes. (8mm)

Check the TRV before engaging in major surgery. I have two *sticky* ones
in a 15 year old installation. Top unscrews to reveal a small plunger. One
day, I am going to ask in here if any sort of lubrication is likely to
help:-)

regards

--
Tim Lamb

I don't have TRVs.

The system is due for a new boiler and whilst I won't be DIYing it - I like
to know what should be done or what could be done. I don't want a plumber
'selling me' plastic trunking down the wall..

I have removed the valve (Twin entry and this confirmed a very restricted
flow down the return pipe. The radiator is slow to heat up - I tried
backflushing with a mains hose pipe attached but couldn't get an
improvement. I am thinking a new pipe back to the manifold might be the best
solution. (By the way - why have I never seen manifolds in plumbers
merchants?)

On Feb 18, 9:23 am, "John" wrote:
"Tim Lamb" wrote in message

...

In message , John
writes
My 1988 house has the C/H pipes behind the plasterboard. I have a concern
that one radiator is not getting hot and have discovered a restricted flow
from one of the pipes. (8mm)

Check the TRV before engaging in major surgery. I have two *sticky* ones
in a 15 year old installation. Top unscrews to reveal a small plunger. One
day, I am going to ask in here if any sort of lubrication is likely to
help:-)

regards

--
Tim Lamb

I don't have TRVs.

The system is due for a new boiler and whilst I won't be DIYing it - I like
to know what should be done or what could be done. I don't want a plumber
'selling me' plastic trunking down the wall..

I have removed the valve (Twin entry and this confirmed a very restricted
flow down the return pipe. The radiator is slow to heat up - I tried
backflushing with a mains hose pipe attached but couldn't get an
improvement. I am thinking a new pipe back to the manifold might be the best
solution. (By the way - why have I never seen manifolds in plumbers
merchants?)

cos they are in the stock room?

JimK