"TheScullster" wrote in message
...


Sounds like the best action would be to talk to the insulation suppliers.
The statement by the floor suppliers that "10mm is not enough" implies
that they have detailed knowledge of all insulation products (unlikely).
As I'm sure you will know, different materials have different thermal
conductivity. There may be some high spec insulation that will restrict
the heat to the value required. Then it's a cost vs hassle assessment.

The insulation suppliers can't answer the question either.
You need to know the thermal resistance of the wood and any covering as well
as the room and pipe temperature to work it out.

You have a sandwich where the top will be at ~ 21C (room) and the bottom
will be at 70C (pipe).
The temperature at any point between depends on the thermal resistance of
the layers and their thickness.