Central heating pipes 'banging/knocking'

[callum84]

Thanks petercj, if it did come to lifting the carpet, is it easy enough to see where the issue would be in your opinion?

I guess it would be a case of looking for the pipe work tht is shuddering or coming in contact with the joists/flooring?

Earlier tonight again it was the regular light banging/pinging which reduced as the trv was turned down, then a londer thump, which as I mentioned almost sounded like a valve closing in the hall subfloor, would the typical system have valve type components?

It is probably very evident that I know very little about heating systems unfortunately, but appreciate the time and effort this form has given me.

 

[phpaul]

Thanks petercj, if it did come to lifting the carpet, is it easy enough to see where the issue would be in your opinion?

I guess it would be a case of looking for the pipe work tht is shuddering or coming in contact with the joists/flooring?

Earlier tonight again it was the regular light banging/pinging which reduced as the trv was turned down, then a londer thump, which as I mentioned almost sounded like a valve closing in the hall subfloor, would the typical system have valve type components?

It is probably very evident that I know very little about heating systems unfortunately, but appreciate the time and effort this form has given me.

ok back to basics is a hatch so u can crawl under the sub floor ? if so investigate that way

 

[petercj]

Chances are your plumber will recognise the sounds when he hears them - might be something quite simple, I wouldn't worry about it too much.

 

[glenno1]

Im sure your plumber will do couple of checks and find what it is

 

[callum84]

Thanks guys, I appreciate the positivity!

In terms of a crawl space, it is literally big enough to get into, the subfloor is not deep at all, so although access I available, it is REALLY restricted, and where the hatch is you would have to crawl a good few meters, and there are dwarf walls running opposite direction to the joists every 1500mm or so, so really it's not great for working underneath the floor or even getting a look.

 

[callum84]

Another thought, could low pressure be a cause of noise in the heating pipes??

 

[petercj]

Any luck callum? Did your plumber fathom it?

 

[callum84]

He said its the pipe work rubbing on the floor joists and the only way to fix is to open the floor up I am afraid, he checked the trvs etc and said they are all ok.

It will have to be done as the tick tick tick is driving me crazy at nights even though the wife sleeps right through it all!!

He said the boiler was working fine, he couldn't really explain why the pressure had been fluctuating (from .75 bar wed, to .5 bar thur, then .75 bar this morning) but he has now put the pressure up to about 1.5 bar (when cold)

So I guess the next thing is to open up the floor, I am 99% sure the noise is from the back bedroom but he even said the noise could be traveling along the pipes from anywhere to he honest ( probably what I wasn't wanting to hear!!)

I just hope the noise will be apparent when I am under the floor, think might just lag all the pipes at the same time as they seem to be fairly bare and the cold snap towards the end of this year could be an issue!!

 

[petercj]

If this noise started at the time you had that carpet laid, there must be a very good chance that its under the floor in that room. Most likely explanation being that the carpet fitters found a loose board and nailed it down tight. Chances are that it won't have a tongue on it, which will make it easy to spot.

 

[callum84]

Petercj:

I think it will be quite a time consuming job as I will have to create a hatch (as previous owners must have floored over any hatch that was there) dwang/support the new opening in the floor, then hope the sleeper/dwarf walls have crawl spaces to allow me to access the problem area - if not I will have to form crawl spaces or it would mean forming a load of hatches to access various areas.

The flooring isnt T&G flooring, its actual floor boards fixed to the floor joists, so I think I will have to 'hear' for the problem when under the floor but hopefully it will be pretty apparent.

All in all hopefully get it sorted this weekend.

Boiler pressure seems to be ok, (fluctuating slightly) but the plumber said this is quite normal for a combi, ie mains pressure / temperature can affect it.