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Wundatherm with laminate - Underlay?


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Hello,

 

We're about to install Wunda underfloor heating 20mm panels. They're suggesting to put an underlay between the boards and the laminate, but this has a tog rating of 0.5 which seems high given we've intentionally selected a laminate with 0.8 tog rating. 

 

How necessary is it to use an underlay on these types of UFH heating panels? Is there any benefit? If it is necessary, can anybody suggest an underlay with a lower tog rating for UFH?

 

Thanks!

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