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Thanks all. Can’t use screed over the top of this system. The Hetta instructions say to use 6mm ply as separating layer over the top of the grooved chipboard in which the pipes are running. Will try and find some 6mm cement board to use instead, any recommendations? Very grateful for all your...

Hi there, we have just installed a Hetta UFH system.. they recommend a 6mm plywood over the top before tiling. I called them and they admitted that ply is a poor conductor. Does anyone have any experience with cement board (such as Hardie backer or similar) to improve thermal transfer in these...