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One more thing. The specs for the 12.5 mm insulation board have this stat: Thermal Transmittance (W/m² x K) 10OC ambient temperature difference 2.69 Confusingly (for me) the number decreases as the boards get thicker. Excuse my ignorance but can anybody advise what this means...

Thanks. Already got a big double convector rad in the hall. No space for anything else. Unless I can find anything else I may as well go for it. Even if the improvement is minimal it is better than nothing.

Thanks, noseall. Very frustrating. Wish we had more options. For what it's worth I now think we can use the 12.5mm insulation boards. Spec says it has a thermal reistance "R" value of 0.36. Means nowt to me. Can anybody suggest any better options? Absolute max depth is 15mm.

Hi, We have an end of terrace 1920s built house. Walls are solid. The hall gets very cold in the winter. Things got worse when we stripped the wallpaper and reskimmed the plaster a couple of years ago. We are looking at trying to insulate the wall. Problems is we don't have a large budget...