Help! SLC fail - Self levelling compound failed Pro 50

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That looks like it's been cooked. Underfloor heating too soon or too hot. What you are describing is classic thermal shock. I suspect some one is not telling you the truth about the sequence of heating post tiling...
 
floor was down nearly 3 weeks before it was turned on.
I have checked the customers stat (intelligent), as far as i can tell it hasnt been above 27c.
 
It could just be me not seeing your photo clearly but it looks like there is not a shread of adhesive underneath your ditra.

The SLC could have cracked if it was to dry. Others may not agree with me but i never put anything on chipboard, even the moisture board. How wide apart are the joists and were you able to screw down all the corners of all boards? or was it just screwed down every 300mm along the joists?
 
floor was down nearly 3 weeks before it was turned on.
I have checked the customers stat (intelligent), as far as i can tell it hasnt been above 27c.

it is either thermal or early drying shrinkage which you would have seen before you tiled. The dry lake bed though is absolute classic symptom of over heating too early in the process. Someone isn't saying something IMO.
 
That looks like it's been cooked. Underfloor heating too soon or too hot. What you are describing is classic thermal shock. I suspect some one is not telling you the truth about the sequence of heating post tiling...

My thoughts exactly
 
The adhesive for holding the ditra is Ardex AF200 - ditras specified glue.
The SLC was made using the manufacturers spec as to the amount of water.
400mm joists. all corners screwed and full length down sides and centers.
its all very strange.
thankyou for the replies!!
 
get the norcross technical involved they will be able to tell you what went on i would have thought
 

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