Balcony floor,

Hi all, Could someone help me with some advice. I have to re do a balcony floor. It was tiled over chip board, the chip board has since been wet and all tiles are lifting, I am half way through pulling it all up it is on steel. One builder said to use cement fibre sheeting but will need to be wet sealed and tiled, I asked if I could just put Tri coat and quick pave over it and he said that when they do the wet seal it builds up on all the joints and you would see the risen joint even one you put the quick pave over it.
Is there any way arround this and or is this correct.
Also I was wondering if could use something a bit cheaper like Form ply, It does need to be waterproof and non slip.

Any help would be greatly appreciated
Regards
Bosimasan