Upgrading concrete path before tiling.

[Tony K]

Hi all. 

I want to renovate the existing concrete footpath shown in the attached photo by laying tiles or thin slabs on top of it. 

 

The existing path is made of concrete 60mm to 180mm deep without reinforcement. The path is generally sound, though it has no sub-base. The path currently slopes far too much for tiles to be laid on it, falling away by up to 80mm over 1.6m, and it stops short in several places where I want to lay tiles. 

 

My plan is to expand the existing path outward by adding 100mm compacted sub base and cement until the path is wide enough, then build up the level of the existing path until it is level with it's current highest point. I can then lay tiles or thin slabs on it. I imagine I will use new concrete laid on top of the existing path to do this. The new concrete will be 80mm deep at its deepest, feathered down to zero where it meets the highest point of the existing path. 

 

Thing is, how should I adhere the new concrete to the existing? 

 

Edited July 2, 2023 by Tony K