Ragman,

In Wxm/N Wales, the contractors leave them clear, putting in stops about 2" either side, and leave the pipework and meter box in-situ.
So, yes, it does leave a 'cold spot'.....

If it's your gas pipe then do what you like

If it's the incoming gas pipe and meter cabinet then where I've seen EWI undertaken they have been relocated to the new external face (and presumably the gas entry point is sleeved through the original wall and the EWI layer)

There is a whole estate of corporation houses near to where I work being EWI'd at the moment - at least the unpurchased ones anyway - aside from the estate looking like some mad jamboree party they are certainly shifting the gas mains on each house as part of the process.

Regards

Barney

Yeah, bit of a grey area but I would think this gas pipe installation would likely fall into two categories - 1, must be installed in a ventilated duct and 2, IGE/UP/7, treated as per timber frame dwellings states that where a copper gas supply is run vertically behind plaster board finish, that the copper tube should be protected by a 1mm steel plate to prevent any penetration. The easiest way of achieving this is to either sleeve the copper tube in mild steel barrel or in fact run this part of the supply in mild steel barrel. The same degree of protection is required when installing a copper gas supply behind the plaster board finish of a dry lined wall.