What is the maximum centre to centre for steel roof trusse for concrete roof tiles, max span 6500mm?

check with you building code. Trusses are quicker and can be purchased with any roof pitch. rafters will have to cut one a a time

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The if the sloped length of the truss rafter is L, the roof span S, the roof angle A, and the overhang V, then the equation for L is

L = V + R/(2cos(A))

The equivalent formula using the pitch, P, is

L = V + (R/2)sqrt(1+P2)

clay tiles have little more lifespan than that of concrete. While clay tile is only popular in its red color, concrete tiles are available in wide range of colors.
Clay tiles break easily but concretes do not. But both concrete and clay tiles are the pinnacles of beauty.

Steel beams will need to be used if you want open space with no poles. Laminated beams can also be used but support poles will have to be added. Build a truss roof over top and do away with the flat roof.

It would make more sense to raise the tiles off the deck, allowing more room for drainage and eliminating the concrete to concrete contact. The air gap would do that, as well as make the water drain much faster and easier, which in turn makes the concrete last longer.

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