Correct order to lay UFH and bal rapid Matt - Tile Advice

[anothergit]

Hi, I am a competent DIYer but would appreciate some professional advice.

Could anyone tell me the correct order in which to lay a loose cable UFH and a BAl rapid Matt?

I have timber floors with existing 20mm floor boards overlaid with ply. Do I lay the UFH then SLC then the decoupling matt or vice versa should the decoupling be installed first and the UFH and SLC onto this then tiles.

if it is the latter should the UFH be stuck directly onto the rapid Matt or onto a layer of adhesive.

i have seen many contradicting views and would appreciate your help

thanks

 

[Time's Ran Out]

What type of tiles are being fixed?

 

[thickbed]

any chance of removeing ply and replacing with 10mm insulating boards screwed and stuck down,lay your electric mat,self smoothing compound then tile

 

[AliGage]

Definately replace the ply.

 

[Rookery]

I would also replace the ply with insulation board, its not that expensive and the ufh will be more economical to run in the long term. My method would be:
Fix insulation boards, fit ufh cable, slc, fix mat, tile. The uncoupling membrane, should you need it, should be closest to the tiles.