Cold room - insulating

Just the One

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The box room in my house is pretty cold and some of the neighbours have found the same thing it their own houses.

I have found that if you knock on the plasterboard it sounds hollow and the wall actually feels much colder than other parts. Could it be that there is no insulation behind wall? A neighbour also told me that the plasterboard is almost wafer thin.

I know that I could rip off plasterboard and put in new insulation and plasterboard but there is a radiator on same wall and I want to minimise the mess/amount of work.

I have heard there is some stuff you can pour into wall to insulated????
anyone have any other suggestions?
 
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