on 16 OC just to be safe. On the other end have a two foot cantilever hanging over posts and beams with the beam being two 2x8's sandwiched together. Birds mouth the joists to fit on the beam.
Use 3/4 inch ply wood for decking with builders felt and shingles.
I think a 12-2 slope would be sufficent. If snow area might increase the slope a bit.
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