Recent content by pajohib

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...

Thanks for the information all, much appreciated. Re: Why a concrete floor and not a timber frame - there is underfloor heating going into the extension so I was under the impression that this would mean the floor should be the 100mm of concrete then 75mm insultation then a 75mm screed and...

Thanks ^woody^ appreciate the info. Doing it after the screed sounds logical but..... are there any options for doing it sooner? Reason being the screed isn't going to get done for some time yet as the plumbing, electrics etc. etc. all need to be done first. The kitchen can't be ordered...

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...