100mm celotex or something else ?

[PaulD]

I've only got 100mm to work with under my UFH pipes, was just going to go Celotex unless anyone can suggest anything better without being stupid money ? Also need to source large quantity, around 450sqm ... any recommendations for best priced suppliers ?

[Thorfun]

What screed are you putting on top and what depth? 

[JohnMo]

For best price search the internet and chat to local suppliers.  Price vary almost daily.  Mine came from insulation hub and it came on lorry direct from the factory. I think I had about 400m2 of 100mm.  Priced recently for another project and they weren't the cheapest, but as said prices vary.

 

100mm isn't much below UFH!

[Dave Jones]

why only 100mm ?