Hi all, hope this is in the right place. I have just studded and insulated my lounge walls with kingspan & placed a vapour barrier over the top with plasterboard, the electrician im using has isolated the circuit and told me to pass the cables through the insulated plasterboard ready to 2nd fix. He came today to complete job cutting out with regular dryline backboxes, I told him this would not seal the vapour barrier and would let the brick walls behind become wet, through condensation forming, he offered to put silcone around cable entry and lugs, Ive told him to leave it till I find some sort of vapour proof back boxes. I then visited CEF electrical & Edmundson electrical, looking for vapour proof back boxes or even fire proof, the sales lads dont know what Im talking about. Surely there must be some sort of back box that serves this purpose. What about these new build timber homes & regulations etc. Canada, America, scandinavia all have some sort of socket vapour boxes. Can someone enlighten me, sorry no pun intended.