Is DITRA Matting worth using?

[Tony K]

Evening all

I have a 4.5m x 7.5m open plan room floor to tile. From the top, the floor comprises:

 

45mm poured liquid screed encasing UFH - (poured months ago and no sign of cracking anywhere).

DPM

50mm PIR

Tanking

50mm waterproof insulation

Concrete slab

Void underneath

 

I will be using standard 9mm tiles. 

 

I am not familiar with DITRA matting, but have had a recommendation to use it. The tech specs on their website do not exactly tell me whether my (slightly unusual) floor composition renders the matting unnecessary, or crucial!

 

Any advice gratefully received!

 

Thanks

 

[nod]

Ditra is brilliant and protects the tiles from cracking I use it every week 

But not on liquid screeds There’s no need 

[Andehh]

We had a liquid screed, cemfast or something, and didn't go with a crack mat. We did on the outside patio which sits on a normal concrete slab.

[Pocster]

Ditra mat all the way on standard screed 

[nod]

Ditra is brilliant and protects the tiles from cracking I use it every week 

But not on liquid screeds There’s no need 

 

As a rule you shouldn’t need to put anti crack matting down for liquid screed 

[MR10]

1 hour ago, nod said:

 

But not on liquid screeds There’s no need 

 

As a rule you shouldn’t need to put anti crack matting down for liquid screed

Can you explain why it's not needed for liquid screed? I'm just trying to understand a bit more as we have just had our screed poured (cemfloor) and with every penny a prisoner I don't want to spend money on Ditra if it's not needed.

[nod]

49 minutes ago, MR10 said:

Can you explain why it's not needed for liquid screed? I'm just trying to understand a bit more as we have just had our screed poured (cemfloor) and with every penny a prisoner I don't want to spend money on Ditra if it's not needed.

You get hardly any movement on a flow screed 

I screeded the one pictured myself with 35 tons of readymix 

But still have movement cracks 

 

As a tiling business flo screed is a god send Hardy any prep work and a week drying time prior to tiles