When the heating is put on for the radiators the pipes make a sort of
When the boiler was last serviced the guy said its probably due to pipes
Now all of the pipes are under the foor and notched on the floorboards.
Can they be held in place in some way to prevent them moving?
I am planning on recarpeting soon so it is ideal to do it soon.
Nip to the local plumbers merchants and buy a couple of rolls of "hair
felt" - cost at the time was less than a tenner.
Cut this as needed and slip around the pipes where they are touching the
floor joists (or on top of the pipes if the floorboards are resting on them)
use it also if the central heating pump or pipes are touching walls etc -
time taken to lift and relay carpets, lift and relay boards, wrap the pipes
as needed and and a few other jobs was around a days work, less the frequent
tea breaks that I'm rather prone to take.
I did this around 15 years ago in my house and it has cured the heating
noise by around 98% (guestimate for the pedants here, but it's a damn site
quieter) - still get the odd bolier noise or air in radiator noises
'creeping' through now and again, but that's intermittent, mostly resolvable
or bearable. 
As a matter of interest, I'd preveiously tried several other method to clip
or raise the pipes to little or no effect and hair felt was the last (and
most successful) plan.
 Did have one problem with boiler noise around 5 years or so ago, but
this was resolved by a British Gas engineer adjusting a valve in the boiler
during a routine service (and after I explained the problem to him [gas
pressure a little high apparently]).
The pipe needs to be free to move, normally along it's length as that
is the direction of greatest expansion. The ticks, clicks, bangs are
caused by the pipe being held firm and eventually the force from the
suddenly overcoming the friction, sticking again, repeat.
No, I simply slipped the stuff loosely around the pipe[s] - don't restrict
the pipes, just let it slide over the felt when they expand and contract
during normal movement.
No problems there - as I said, I did it around 15 years ago and the stuff is
still working nicely - even surviving a change of boiler and a CH system
flush (both by British gas, with around 5 years between renewal and
Presumably then if pipes are not touching eachother the noise is oming from
the pipes ''rubbing' on the joists as opposed the the sound of them
Did you do every single joist the pipes touched?
I would say *yes* to that (where it was possible, and some of mine are
inaccessible for a number of reasons) - along with any pipes that touched
walls etc, even down to checking where the radiator tails disappeared under
In that situation where radiator tails were touching boards, I simply
removed the board and eased the 'hole' for the tail, or nudged the tails
away by just slackening the radiator valve and pushing the them slightly
(where possible, and great care must be taken in doing so).
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