woodsmith
|
Without a decent cavity between the walls you are likely to have damp bridging the cavity unless the builder has done an impeccable job and both internal faces are perfect which is doubtful. I don't know how much space you can afford to lose, ideally you could do with applying a membrane, battening the wall and fitting foil backed insulation between the battens before fitting a vapour barrier and then plasterboarding. However if you don't have that much space to lose you could use insulated plasterboard. In which case you would dot and dab them to the wall using plasterboard adhesive and then adding some screws to prevent the plasterboard from parting with the wall in the event of a fire. If you are dot and dabbing the plasterboard you can't fit a membrane to the wall use the close cell foam insulated plasterboard and it acts as a vapour barrier so no need to add one of those either.
|