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That last time I studied physics wood wasn't a good conductor of heat at all!

Think that's an understatement. By my calculations you're sending about 90% of the heat to Australia if you stick these boards on top of the heating pipes. :D

Is the temperature near the loop's return noticeably lower than near the start?

Thanks, yes will go for the ditra. I was also wondering what the U-value of the Polypipe Overlay system boards is? (These: http://www.polypipe.com/housing/underfloor-heating/underfloor-heating/overlay-system) They're 18mm thick (and gypsum based I think) and designed to be fitted directly onto...

He ended up taking out the 6mm Deltaboard and replacing it with Ditra in the first area where it has been installed. We're also getting it put into another section. On the Polypipe web site it suggests tiling directly onto the overlay board as an option. I can't see any references to problems...

I'm guessing he should have used ditra or a self levelling latex compound?

My builder has just installed a Polypipe (http://www.polypipe.com/housing/underfloor-heating) underfloor heating system. On top of the Polypipe system he has stuck down Deltaboard thermal construction board to make the surface smooth and flat for tiling. My concern is that Deltaboard thermal...