New extension plus redone (2023 spec) floors to most of my house, ready for wet ufh, BUT I have one room, built in 1982, floor is Concrete/cement over substrate.
This has no insulation layer, but I'm not inclined to dig it up!
What's my best option.... use overlay boards with a some insulation properties, or ignore the fact and chase into the floor to install pipework? How much of a difference is there?
Anybody with experience of retro-fit onto this kind of floor?
Thanks in advance