Most efficient insulation board for thickness

[acaciaguy]

Hello all,

I have a very small cloakroom to do and they want electric underfloor heating. Contrete base and I have about 10mm depth I can use for insulation board below the heating. What board gives the best insulation?
Many thanks

 

[Boggs]

The thicker the board the better the insulation, have a read through this gives all the u values achieved etc.

http://www.marmox.co.uk/uploads/catalogue_gallery/47/datasheets/Insulating...with...Marmox...Multiboard.pdf

 

[acaciaguy]

Thank you for this. Interesting stuff

 

[Dan]

Yeah the difference between having even 6mm compared to nothing is massive. But the difference in having 10mm to 6mm or 20mm to 10mm is negligible.

A 10mm marmox only has 8mm insulation too. XPS board on its own is the way I'd go.