Underfloor heating insulation question

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Hi,
I am having underfloor heating put in in my bathroom - I am getting insulation boards to put on the concrete floor.

I have a free standing bath - do I have to put the insulation boards under this as well?, even though there will be no underfloor heating there, just to ensure I have a level floor for tiling (someone else is doing the tiling)

Thanks for any help

PS
Are 10mm boards adequate?
 
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you neglect to mention whether this is electric or water underfloor heating?

also, this seems to be more suited in tiling or plumbing... we just wire the damn things up..
 
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have a free standing bath - do I have to put the insulation boards under this as well?, even though there will be no underfloor heating there, just to ensure I have a level floor for tiling (someone else is doing the tiling)

Would it be best to ask the person doing the tiling?

I know this isn't a electricity answer and this isn't the tiling forum, but make sure your tiler uses a PTB FLEXIBLE ADHESIVE AND GROUT!!

http://www.bal-adhesives.co.uk/bal/bal_products/ptb_flexible.asp

the reason is underfloorheating heats up and cools down and the adhesive and grout need to expand and contract accordingly. If you use a normal adhesive it will be OK a couple of years, but then will start craking up and tile will be loose. PTB is a lot more than normal adhesive, but is worth doing job properly.

(Promise next post will be electricity related)
 

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