tiling onto synthproof or black jack

[sranners]

Hi all, its been a while.

Iv turned up to do a kitchen floor but it has been treated with synthproof or was called black jack by the instalers. I dont think i can tile to it???????????
Can i!!!!

 

[DHTiling]

Not something i would do... why the hell have they done that..??

What substrate is it..?