Help! SLC fail - Self levelling compound failed Pro 50

[Budha7]

it is indeed a 3IE.
I will send them an email now.
Fingers crossed!

When i asked this
'In your opinions, could you please clarify whether you believe me to be at fault, or the customer?'
what i meant was, do you think what i have done is incorrect and caused it, or the customer has been playing around and caused it?

 

[One Day]

I have to agree with Alan - thermal shock on the slc.
If the floor had too much deflection I would expect to see a lot more crazing and loose areas in the slc rather than the way it looks here.

 

[One Day]

If you're struggling with Warmup on email (give them a day or two) pm me. I have mobile numbers for some very helpful people there.

 

[Budha7]

is it possible for my warm up timing to of caused this?

 

[One Day]

is it possible for my warm up timing to of caused this?

Yes - if you heated it too high and too soon.
Also, if you fixed the Ditra while the slc still had excess moisture in it, then that trapped moisture could have fried the slc.
Do you know how thick the slc was and how soon you fixed the ditra after pouring the slc?

 

[Chalker]

What backer board was used? Was it glued down?

 

[Budha7]

the slc is approx 8-10mm, from pouring to laying would be approx 48hrs.

it was jackoboard, not glued, just screwed.

 

[Budha7]

Norcros instructions, do not turn on for 14 days, and then bring temp up max 5c per 24hrs.

 

[Qwerty]

it was jackoboard, not glued, just screwed.

Out of interest why not glued?

 

[Budha7]

Hi,
jackonboards spec is to screw down to timber at 300mm intervals, so that's what I do.
I find if I were to glue instead/aswel there is additional cost of time, primer, adhesive, also raised flooring height.
im not saying glueing is wrong, it's just not something that I do.