Context is key. Pictures will help. Also what type "flooring" are you looking to use? Typically a roof deck with sleepers would be used, but without more info no way to tell if this is even possible.

Roof decks are very perilous. They often are not built correctly , and create massive leaks into your home. This is a lot more technical than what looks pretty. It goes deep into the fundamental structure of the home, and what material was designed for the covering. Pedestal systems with pavers are one popular choice. As is thinsetted porcelain to a waterproofed concrete slab. And decking over ice and water shield. All have their drawbacks. All have to be designed for before you get as far as you've gotten. .

Sorry I have that part covered. I am looking for color coordinating with roof and interior as it is a large 9 ft slider so the first thing you will see is the outside flooring up against my interior floor.

What material did the architect who designed this specify? That's where you start. And with the installation system that he specified as well. You don't change that after the fact.

" Sorry I have that part covered. I am looking for color coordinating with roof and interior as it is a large 9 ft slider so the first thing you will see is the outside flooring up against my interior floor. "

But that all has to do with what material can be used, and the optics of the entire area. Pictures are needed as well as what can be used with the way this is constructed. It all ties together.