DIY Doctor

Main navigation

radiator driving me nuts with tapping

Postby thefallguy » Mon Feb 14, 2011 7:16 pm

Hi guys,

I'm at my whits end with my hallway double convector rad. When boiler running all I can hear is a contstant tapping, every 10 seconds or so. Then throughout the evening, presumaby when the pipes cool, the same tapping but not as often, say 20 scds. I know that pipes will expand/contract with heat but

I've listened to it and it's defo coming from the middle of the rad to the lock shield side. It's defo NOT coming from the flow/return pipes either above or below the floor.

I've recently had a plumber in to add another rad in down stairs loo. Told him about it. fired up the boiler after draining the system. stood there and listened - nothing. Sat down that evening in living room, heating been on a while and all you can hear from the hall way is the tapping from the rad....AARGH

Is the rad knackered? any suggestions? Thanks
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Mon Feb 14, 2011 7:04 pm


Simply Build It

Postby stoneyboy » Tue Feb 15, 2011 10:41 pm

Most likely that the jumper is loose in the lockshield valve but if you have TRVs look to see if they are dual flow ones. Single flow ones fitted on the wrong end can also cause knocking.
Rank: Project Manager
Posts: 4928
Joined: Wed Dec 10, 2008 6:44 pm

Postby htg engineer » Wed Feb 16, 2011 6:45 pm

On some radiators you get little plastic or rubber inserts which sit in the radiator bracket between the bracket and the radiator - to prevent this.

I doubt it is the radiator valves. It does seem to be expansion.

htg engineer
Rank: Project Manager
Posts: 3256
Joined: Tue May 22, 2007 5:22 pm

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics