In this Video Matt reviews the Schluter Ditra underlayment system. https://www.schluterevents.com/en/nor... This is the event website Matt refrences. More info on Ditra at their official website here: https://www.schluter.com/schluter-us/...
For some general pricing here's Ditra XL on Amazon. https://amzn.to/2EAOt71