Why is insulation just 10mm thick when many systems require 50mm+? 

Accolade’s Metallic Alloy ribbon mats operate at a lower temperature over a larger area, which means there is no need for the thicker insulation other UFH systems require (which can cause floor “build-up” issues).

You may of course choose to use a thicker insulation material, but a 10mm layer will be adequate for the majority of installations.