detail a flat timber roof with membrane and then provide a concrete paver top ( on risers to protect membrane surface and allow for drainage ) roofs are never in fact flat so don't forget the min 1% slope although I would use a min 2%.

I'm not even sure you need the pavers...but you would need a surface suitable to both water drainage & pedestrian traffic - even if minimal

epdm...rubber......... not epmd (for those that know)

There is a waterproofing system that doubles as traffic topping. And/Or you could detail a wood deck above this to "flatten" the roof.

multithane elastomeric coating used for roof decks...for the crossover to what architechno suggested

Or pick a company... there is surely a detail in there.

good idea...

two words: dec-tec

http://www.dec-tec.com/

Hydrotech has this condition detailed. Check out their website. 'Course they do green roofs too, if you care to walk on grass.

zacman,
there are several projects in detail utilizing this exact detail. basically, it's as whistler says above, but we've used cedar/larch as "sacrificial" boards (it sits above the sloped roof on sleepers)

there are several ways to do it, though.
look up the ebeling house in dortmund by archifactory


also, the roof house by tezuka is an interesting, though not "legal" approach

that's a green roof, but you can easily replace the drainage/roof barrer + soil + vegatation with any material you like.

there's a system called schluter that might work http://www.schluter.com/2080.aspx

you still need a 1/4" per foot slope.

I have checked that design in detail magazine, will upload a scan of it later. I will also upload what I've done for your comments / critiques.