Quick drying screeds - decoupling mat or not?

[kandgmitchell]

Right, another interior finishes question. Quotes for laying 65m2 of floor tiles include for decoupling mat. However, since the kit supplier's tilers are doing the bathrooms/wc as part of the package, I asked what they use and found they do not use them. Given the house supplier gives a 20 year guarantee and they obviously do loads of these, I'm inclined to go along with that.

 

They use a quick drying Tekcem Rapido Witt cement with sand. See attached pdf. They will heat the screed up to 55 degrees gradually with a piece of kit that's programmed to step it up day on day.

 

Anyone use this stuff? Comments?

TEKCEM-RapidoWITT.pdf

[nod]

Unless there is obvious movement You don’t need decoupling mat on flo screed 

[kandgmitchell]

Many thanks Nod