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Hi, For my new extension I need to lay 75mm of insulation on top of visqueen which is on top of 100mm concrete. It must not exceed a u-value of 0.22. I have the opportunity of some 75mm xtratherm thin RXT/PR at a very reasonable price and it meets the required spec but I have just learned...

Hi, I've just joined having recently had a two story extension completed, the builder has done pretty much everything I asked him to do so now I have a large empty space with a nice new 100mm concrete subfloor. On top of this the plans show 1200 Visqueen then 75mm Celotex then 500 Visqueen...