This idea of needing to dig down to china to make sure i have miles of insulation under the UFH just isn't required...I'm not needing to warm up the ground surface, I'm wanting the heat to be reflected upwards....the beauty of floating floor on top of ufh IS that it heats up quickly and cools down quickly imo.
Just out of curiosity, what have you read, or been told, that has made you form this opinion ?