Help! SLC fail - Self levelling compound failed Pro 50

[Ajax123]

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.

 

[AliGage]

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

 

[Budha7]

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!!

 

[demi34]

Underfloor heating should be on top of ditra and not under

 

[Spud]

get the norcross technical involved they will be able to tell you what went on i would have thought

 

[Ajax123]

Underfloor heating should be on top of ditra and not under

I don't think it really matters from a purely mechanical point of view.

 

[White Room]

Underfloor heating should be on top of ditra and not under

Not necessarily, Schluter state either....preference below ditra.

 

[Budha7]

whoa. if thats the case, how do I prove that?
On turn on the floor was 20c, I turned it on, as far as I am aware, i then programmed it to 24c for 3 days, then upped it to 27c. Which as far as i am aware is where it is stayed?

 

[Budha7]

 

[Spud]

whoa. if thats the case, how the F. do I prove that?
On turn on the floor was 20c, I turned it on, as far as I am aware, i then programmed it to 24c for 3 days, then upped it to 27c. Which as far as i am aware is where it is stayed?

was it turned on prior to the thermastatic control being fitted ? it happens a lot some sparks wire it to a plug end for testing i had one try it on my job last week

 

[Budha7]

Thankyou all very much for your replies, im trying to reply as quick as I can while putting my daughter to bed.

 

[AliGage]

Underfloor heating should be on top of ditra and not under

Why???

 

[Budha7]

I have actually been in contact norcros technical prior to being on here.
I am not happy with their response.

 

[Budha7]

I wired it up, so i know it is correct, but good point.

 

[andyb1]

What was teir response then.