Waterproofing deck - flashing

Hey

This weekend I am ripping out my existing desk and laying new compressed fibre sheeting.

I will then be getting the substrate waterproofed and tiles laid.

My question is about the flashings between the substrate and the wall.

From my reading you glue a PVC cellular corner mould to the floor and then have the wall flashing sit over this.

My problem is the wall is already built and its no possible to stick a flashing on the wall. As I understand it the flashing is chased to the mortar between the bricks... I can't do ths in my situation..

What are my options? What is the best way to waterproof between the areas between the substrate and wall?