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Hi Mountain walker. I am afraid I am unable to help you with specifications. U values and insulation ratings are a mystery to me and there is no brand name on the board I used. I got it from a local builders merchants in south wales. Its a 9.5mm board with 12.5mm of polystyrene on the back. I...

DSXekmC4 Hi All. Thank you for the advice 'alittlerespect'. I went ahead and used a plaster board with 12 mm of polystyrene back and a 9.5 mm board. I screwed it direct to the wall. So far, the heating has stayed off over night and the hall stairs and landing are so much warmer. The total...

Hi All and happy new year! I have just bought a 1960's solid concrete house, it is end of terrace and the hall stairs and landing are on the end wall (which faces east) which is very cold. There is no damp, just a small amount of black mould which cleared up when the wall paper was stipped off...