We have a room in our 1930s house which has 2 external walls. The outside is rendered and there is no cavity, i'm not entirely sure what the walls themselves are made of. brick/block etc.
Anyway this room is disproportionately cold compared to the rest of the house, and we want to move our daughter into it. so we need to sort out the temperature issues.
It has a relatively large radiator - but i think the problem is really the insulation. I've laid an extra layer of insulation in the loft above this room but it didnt make any difference.
The window is double glazed and doesnt have any draughts.
So i'm wondering if there is any way to boost the insulation in the walls? some sort of additional insulated board? I'd obviously be looking for maximum performance for minimum additional thickness. Any other ideas? My builder mentioned insulated plasterboard, but I want to be really sure that whatever solution we go for will actually work. Do i need to get some sort of insulation expert in to assess it?