Hi hoping someone can give me some advice. I have a concrete hearth which is about 25 to 40mm below floor level. I want raise the level up so it's flush with the boards. (See attached pic) My plan was to wet the cinc and then brush in a cement slurry followed by a 4.1 sharp sand and cement mix. And float the top to get a nice smooth hard surface suitable for tiling. Just wondered if this is the best approach here or if it's should be done differently. Any advice is very welcome cheers