Do I need a decoupling mat?

[BillyBBag]

Looking at tiling the whole downstairs of my house, I'll be using

600x600x10 porcelain tile
Adhesive
Screed filled profix UFH trays
Self leveling screed
Epoxy 2 coat DPM

According to profix, you can tile straight onto the top of the trays, the screed only fills them flush with the top.
My question is, does anybody think I need one of these decoupling matts between the trays and the tiles?

 

[Dumbo]

What product are you using to fill the trays .

 

[BillyBBag]

Not sure yet to be honest, maybe levelflex?

 

[BillyBBag]

Or tilemaster pro flow as it appears to be self-bonding?

 

[widler]

up to you, some say yeah some say nay

 

[Simon Dale]

Probably shouldn't say this but most manufacturers say tile direct. Don't believe them use matting for your own peace of mind 😉

 

[BillyBBag]

Probably shouldn't say this but most manufacturers say tile direct. Don't believe them use matting for your own peace of mind 😉

Is it simply to avoid cracking if there's any movement?

 

[Spare Tool]

Am just on with a couple of wetrooms at the moment, putting ci mat down for my own piece of mind, however the builder has already tiled another two rooms straight onto polypipe boards and the heating has been on and off for months with no cracks or signs of failure, I've fixed porcelain straight on them a few times myself in the past with no problems, but also had an Lcut crack so it really is your decision, if you can afford to take the will it, won't it out of the equation then mat it..