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cheers, what kinda thickness would you recomend?, also would these do the job of both the insulation and the vapoir barrier? Kingspan TP10, TF70 and TW55 Thermal Boards (foil backed PIR foam boards)

thanks for replying prentice, the elec cable at the moment runs in a plastic conduit, would that still be effected by the polystyrene? with regards to thermaline boards would the principle still be the same then apart from not having to use two diff sets of materials it would just be one...

Hi'a I have an old extension which is a single skin wall - want to use the room more then just a dumping ground so i;m in the process of insulating it etc etc. have a couple of questions though. I've put in two air bricks on opposite walls facing eachother for a bit of air flow - they are...