First issue will be to determine if the roof structure is suitable for use as a deck, ie; can it support that kind of load. Next will be to find out what kind of regulations you must meet in order to do it.
Once you've done that, then you'll have a better idea what you need to do to complete it. You will almost certainly need to beef up the decking as the original sheeting is unlikely to be heavy enough to support repeated walking on. You'll need to add some sort of railing to prevent falling off, and some sort of stairs for access. Lastly, you'll need to use some sort of roofing membrane that will keep the water out while not breaking down from the foot traffic.
Or you can just toss a couple of lawn chairs up there and play the odds.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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