Hi all, I'm looking to fix a tiled hearth to a concrete floor that has been leveled using a self-leveling compound. There will be no heat coming from the fireplace, it is purely decorative, possibly an electric fire may be installed in future but just for the light effects. I want it raised about 18mm as my wood flooring and underlay together is 18mm. It doesn't have to be exact, just raised enough so that the floor doesn't hide some of the patterns tiles around the hearth face. I was thinking of either doing: A) Full bed of mortar (Should I be using SBR for better adhesion?) B) Grip fill or tile adhesive (flexible?) - with either a plywood base or creating a timber frame and leveling off a concrete base? Can anyone advise?