We are designing a multi-level stone patio. To exit the kitchen directly onto the stone patio, the highest part of that patio would be 12 inches above the foundation. The next level would be flush with foundation, supported by a poured concrete slab (elevated with cinderblock, reinforced with rebar, filled with crushed gravel and another layer, etc.).
What is the best way to elevate the upper patio to meet the level of the exterior door?
One idea was to pour a slab to the level of the current foundation, create the necessary elevation from there, (16" center joists?), install cement board over joists, then lay stone or outdoor tile directly onto cement board. The area is not covered so the manufacturer warranty is less than when using for an indoor application. Any better ideas?
Has anyone used cement board outside on a floor (not wall) and had it hold up 10 years? 15 years?
(There was a question about this with an outdoor bbq about 4 years ago, but no update on final solution and results of that project.)
I don't know how to link to another question, but it was from Ronnie, titled What cement board do I use for an outdoor bbq?