Increasing porch floor height prior to tiling

[James3857]

Increasing porch floor height prior to tiling

I'm planning on tiling my porch, and the tiles and adhesive will take up around 13mm of height.

The porch is currently back to the concrete slab, which is around 70mm below finished floor height. This means making up 50-60mm of height. This seems too thick for bonded screed, and too thin for an unbonded screed. I was thinking of using chipboard or plywood, but from what I understand this isn't an ideal tiling substrate. I do have some spare 6mm hardi backer boards I could use.

Any thoughts welcome on how to tackle this.

Thanks

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