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In your link it says you can add these: https://www.downlights.co.uk/click-inceptor-nano-insulation-cover-guard.html Not insulation coverable but the Click ISC1020 can be added to make it insulation coverable.

Thanks for your help guys but I am really interested in the reasoning behind the regulations. The route above the cavity is neater because the pipe from the boiler can run straight up the wall next to the boiler and enter the roof void between the rafters. The pressure drop is not an issue as...

Can some fellow 'competent person' or CORGI member please tell me the reasoning behind the regulations that do not permit installation of a gas pipe in a cavity wall? Is it in case someone drives a nail or drill through the pipe and then gas would leak into the cavity? The reason I ask...