Hi, Just installed Nuheat wet underfloor heating inside 50-65mm screed and layed laminated tiles on top. Works pretty well except the underlay is causing me some concern. 1. The underlay is budget Topps tiles blue foam underlay with a low U-value and a possible Tog > 0.35? (unknown) My question being has the underlay got good enough conductance properties to transfer the heat from the screed efficiently and transfer to the laminate tile? and is there a proper underlay for this purpose?