Anyone recommend a good PTB adhesive.

[jjoc]

I'm looking for a thick bed adhesive. I'm laying large format limestone (800x500) onto a heated screed (with ditra). I was planning on using a 20mm square notch trowel so wanted a thick bed adhesive.
I've looked at the BAL one, but to use it on UFH it requires admix aswell which will bump the price up. Was hoping for a single part.
Any suggestions?

 

[nybor62]

jhonsons do a ptb flex

 

[Perry]

i always use PCI or Sontex

 

[DHTiling]

Mapei marble and stone adhesive.

 

[jjoc]

thanks guys, i'll check them out