Best Practice: How much insulation to go in new base for UFH

[Udhi]

Hi all,
I have just spoken to a plumber who can install Wet Under Floor Heating for a 15SQM conservatory. He is going to use a POLYPIPE brand system.

The base is yet to go down. I would like to make all the right choices from the off. First is how much and what make of underfloor insulation should I request? I was planning on 70mm KINGSPAN until someone told me you could go as much as 300mm??! Then someone else mentioned CELOTEX Fast-R FF3000.

Any advice on what to specify, really appreciated.

The tiles will be Travertine or Sandstone, if that makes a difference. I will come back asking about the best bedding and tiling compounds later.


Regards

 

[^woody^]

70mm kingspan/celotex is the minimum. I don't know what real benefits there will be with more than 100mm though

 

[Udhi]

Yup, I was recommended 70mm as a minimum. Another site has been quite forthcoming. The recommendation in there is for about 150mm over which we have diminishing returns.....

I need to go have a yack with with the conservatory bods - renegotiate and what have you...

U