Underfloor heating mats

Hi,

I'm going to be installing underfloor heating mats (150w) but I'm after some advise on the insulation boards to put down first. They seem expensive I was wondering is there a cheaper alternative? Or am I going to just have to buy the boards they recommend with the mats?

Iv never installed underfloor heating before they look pretty straight forward? Any advice would be welcome.

thanks

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