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Any more than any other non-barrier? I thought that was largely a myth anyway, as you get more air from valve stems etc than through the pipe wall?
My thought was that Shaun was suggesting this section only, so I don't think this can be what he meant as, if a heating system is plumbed in non-barrier, there is little point in replacing a small section, and the OP has already stated he isn't up for re-doing the whole house.
Also, is this even a heating system? Could just be supply pipe to a WC cistern for all we know...
In all honesty @Ric2013 , I have no proof if it is true or not.
It was something I was told by reps from different plastic pipe manufacturers, as well as an article I read on it years ago along with what Plumbers merchants and other Plumbers have said. This was when barrier first appeared.
I presume that there is some truth in it but can't swear by that. If you know different then fair play, I could be wrong. It does sound like ballcocks but we could also be talking about molecular sized issues! Air/ Gases V's Water??
I do not use plastic pipe as I think it is messy looking and takes all the skill out of the job. Anyone can push fit things together and do a hose pipe job and to my mind that is all it looks like. My opinion. I was working before the craze.
I realise that a lot of people use it and there are good enough reasons for that so I am not saying that 'skilled Plumbers' do not use it, that is not the same thing as saying there is little skill required to use it. I also think it allows DIY or other trades to do 'some' Plumbing with little knowledge of the job itself. This usually leads to me n thee mopping up someone else's mess.