Laying limestone over T2 reflecta insulation board

[jonnyc]

Looking at a job wher the spec is 45-50mm screed laid over existing concrete base .
two large areas .
the reflecta panel which is 13mm thick has an aluminium face on which t2reflecta -p-fix primer is applied before any flex adhesive can apparently be used to fix 20 mm limestone on top .
the reflecta panel is glued to the screed with a raychem adhesive.
The t2 red cable Is electric and clips in to the grooves in the insulation board.
has anyone used this system before ?

bit similar to the polypipe over lay except using electric heat wire rather than water pipes as in poly pipe system.
with polypipe the only guaranteed method I know is to glue and screw 6 mm hardie backer or similar on top of insulation.
any info or experience of fixing on this raychem system appreciated

 

[Spud]

the raychem system is just an electric in screed cable system and I thought that the screed was supposed to go over the panels and you just treat it as a normal heated scree ,not sure what the benefit is over a hydronic system Jonny tbh as it is more expensive to run and you dont save on the ffh .

 

[jonnyc]

Gary
decision already made to use this system and prep under way.
my worry is fixing directly on top of aluminium plates and heat wires.

 

[Time's Ran Out]

Why not uncouple it with Ditra?
Not a great fan of such direct heat variation to surface covering especially Limestone.
Did a similar substrate with porcelain over wet system a few years ago and then did clients next house floor (of different construction) 2 years later - so I assume it was ok.

 

[Rookery]

Irrespective of the type of ufh, I would always uncouple when fixing stone.

 

[jonnyc]

ok I think I would prefer to uncouple with ditra but theres no way schluter will guarantee ditra stuck on top of a aluminium plate I think.