I have just moved into a house with solid stone walls which was renovated in the 1970’s and dry lined. There is no insulation behind the plasterboard. The plasterboard is on 50mm studs with a good gap behind. This gap varies between 75 – 150mm around the house. This info is from removing electric sockets to look behind. I would prefer not to just stick insulated plasterboard on top due to reduction in room size and am thinking of removing the plasterboard, fixing in kingspan between the studs and behind them where possible and replasterboarding. I think it would be good to leave a small gap from the kingspan to the wall for ventilation.
Will this work?
Will I need vapourcheck plasterboard as the kingspan has foil on it?

  • Adam


    I’m afraid I can’t give you any specific insight into this particular query. I don’t have the specialist knowledge required to assist. You should get yourself some expert advice to make sure you avoid creating problems instead of solving them.

    In the meantime this may be a good start for your research/investigation


    I’m sure there are all sorts of other online resources. You could even try the technical departments at companies like Kingspan to see if they have any useful information. Don’t be afraid to ask questions. They don’t bite!

    Good luck.


    Your biggest challenge is interstitial condensation (moisture at the wall where insulation meet). Your brickwork will be porous and breathable, so it will let in moisture and let out moisture readily. I would insulate between the studs but would parge the walls (cement fill) to maximise your air tightness (this will help with the condensation issue too). Make sure your insulation on the wall side has a vapour barrier and ensure that you thoroughly seal your insulation on the warm side too. Very important that warm draft air is not sucked out into the brickwork, if it does, this will generate the interstitial condensation.

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