New balkon roof (bitumen on wood) - what to put on it?

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It's 3,80m x 1,90m new wooden deck (20 mm mulitplex) covered with bitumenous hydroisolation with upstands on the sides. Upstands are protected with lead stripes embedded into the wall above the upstand, overlapping the ends of the upstands.

What can I do now - what can I put on the deck in order to use the balkon?

Over here the practice is to create a sort of floating floor: put rubber pads on the bitumen deck, and put on those pads wooden planks 10 cm wide and 180 cm in length as a support for the floor. For the floor they use long meranti hardwood floor planks and screw it into the wooden planks below. That wood has ribbed surface and is terrible to maintain, it attracts moist and green moss deposits. Other solution are some plastic floors - tiles or planks, with even worse capacity for simple maintenance. As we are sometimes longer away, such floors will be a disaster, because there is a lot off rain here. The idea with these floors is that rainwater goes through it and then being evacuated by the bitumen surface.

Is it possible to create a solution that will cover the bitumen and make it safe to walk (there will be very little use and not really "walking" there), yet keep the water evacuation well and avoid creation of more space that will need maintenance? Can now something be moulded on top of the bitumen, concrete, epoxy?
Thanks for any suggestion!
 

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