What are my best options for insulating an internal wall of a non cavity wall house and not lose any room space? The room itself is the box room with a bed. I thought about insulated boards but they seem to start at 30mm which means the door would no longer close. I am now thinking of removing the plaster to expose the brick and fixing the boards to the brick. Is that a viable option or slightly mad? As u can gather I'm a novice., it's for my kids room and the condensation is causing mold spots so want to try and sort it. I already have a dehumidifier which does some good during winter months. Any advice be greatly appreciated.

Hi,

You can get insulated plasterboard

http://thermalboard.co.uk/

SSM

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Measure twice, cut once!

Back to the brick, then insulated plasterboard attached using the foam to avoid thermal bridging.

Check the building regs if you are doing more than one room because you will have to work to a minimum spec if you do more than 25% of the house this way in future.

What thickness is original plaster normally and what thickness will the board + plaster be? trying to do some quick maths to see if I will lose any room width and end up with the door not closing.

Plaster can be up to an inch thick, insulated plasterboard from 27mm plus adhesive, approx 5mm.