Simtronic Posted January 9, 2021 Share Posted January 9, 2021 I just checked and my underfloor has only 70mm celotex boards over existing slab then 18mm composite boards on top. I went with fan coils downstairs as I couldn't afford to raise floor height from that. Has anyone tried one of the low profile fibre board underfloor heating or is that a lot less effective than concrete ? I know you can get 18mm or even 15mm systems now. I guess the lack of thermal mass would mean it cools a lot quicker but would also warm quicker too. Link to comment Share on other sites More sharing options...
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