We havent had ours laid yet but they will be using a crushed gravel base and then crushed stone before laying the pavers. Until they figure out the exact grade, I wont know how much of the existing concrete patio will be removed. Personally I want it all removed as to keep the same step height that we currently have when stepping from the house out to the patio. But even over the concrete they are not using thin set etc. Even though we are in Florida, being as north as we are, we have had years when we have had hard freezes for over 4 hours, some days the ice in my horses water trough never melted, so it does happen here.
We went with silver as our color scheme is silvers, cool toned blues, greys, etc. Of course there is tan/ivory mixed into the travertine but it is predominantly a silver and grey base with the tans mixed in. We are doing the French pattern. These are pics of the product installed at another project recently and photos of the product that was shipped here.