Ditra on fermacell overlay.

[Chalker]

Fermacell recommend only using a thin bed of adhesive on the 25 mm overlay, but I'm about to tile a floor with 600 x 600 tiles. Unfortunately the floor has a 10 mm bow in the middle of the floor 4.5m long. Should I use ditra, then I can increase the adhesive bed or could I self level the floor? Not sure about the suitability of s/l on fermacell.
look forward to being educated!
thanks in advance.

 

[Time's Ran Out]

I'd have levelled the floor before laying the insulation board!

 

[Chalker]

Unfortunately I didn't lay the boarding so we are stuck with it now.

 

[Ajax123]

I assume the terms ell is laid over a timber floor. Make sure the weights of levelling compound and tile will be ok...

 

[Chalker]

It's on 50 mm polystyrene with underfloor (wet) which is laid onto block and beam floor

 

[Time's Ran Out]

Sounds like a floating floor to me!