Bump up height of existing slab pre-tiling?

dmennenoh

Hi asked this in concrete and thought this might be more appropriate. Anyway, I have an existing concrete landing and step that I want to add outdoor ceramic tile to.
My problem is I need to add about 3/4" height to the top landing in order to make the step height even. I thought I could add a 3/4 piece of concrete board over the slab and then tile that, but was told otherwise... On the Durock web site they say this:

"DUROCK cement board Next Gen is moisture and mold resistant and does not deteriorate, swell, soften, decay, delaminate, or disintegrate in the presence of water, making it the perfect choice for baths, showers, kitchens, and laundry rooms. It is also suitable for exterior applications, including fences, mobile home skirting, agricultural buildings, garage wainscoting, and exterior finishes."

If that's not the right way, can anyone let me know what the right way is. Also, if anyone has any pointers on the best way of tiling over existing concrete landing and step I'd appreciate anything...

thanks