Hi!
I'm looking for some advice, I have laid some SLC (Mapei 1210) in our conservatory in preparation for tiling. A couple of days after there's a lot of very fine cracks which have appeared, you can't even feel with a fingernail. Am I okay to proceed in laying my Ditra or should I rip the SLC up and go again?
Here's the process so far:
I'm looking for some advice, I have laid some SLC (Mapei 1210) in our conservatory in preparation for tiling. A couple of days after there's a lot of very fine cracks which have appeared, you can't even feel with a fingernail. Am I okay to proceed in laying my Ditra or should I rip the SLC up and go again?
Here's the process so far:
- Cleaned the existing concrete and previously (badly) leveled floor extensively
- Primed with an acrylic primer from CTD as recommended by them. I applied a 3:1 coat followed by a 1:1 coat as instructed.
- Mechanically mixed the 1210 with the correct amount of water using a measuring jug and poured from 1mm to 6mm thick in places.
- Left to dry for 36 hours
- Then noticed a very thin layer of fine white powder, after sweeping at it I then noticed these very fine cracks running throughout a good majority of the ~11m2 floor in seemingly random directions (i.e not from a particular corner of the room).
- Unable to feel the cracks, which so far do not appear to be expanding (although it's only been 3 days)
- Tapping with a hammer and dropping a golf ball on the floor does not sound hollow
- Walking on the SLC does not produce more cracks
- The SLC appears well bonded and does not chip
