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Hi, I am glad to hear you might have some income soon. Very best of luck!
I enclosed a photo of my rear porch, called a 'hip roof'. This follow the idea you had of putting corrugated vinyl sheeting up. The best way would be to put stingers from about 4' beyond the roof edge so they lay on the existing roof. The issue being how to secure them to the surface. You live in snow country, so even with something as slippery as the corrugated vinyl, you need at least a 3-1 slope. I would hesitate to recommend anything flatter. You need the snow to have a way off. I also see it's about 16' across your deck? You could put a 4x4 ( of course!) in concrete footings just outside the perimeter at the 8 ft mark, but You will need to build a cross beam that it strong enough for that long span, other wise you are going to need a center support post. I totally overbuilt my porch, 8x8 rough cedar, but I live 3 miles from the local mill, and we're friends. But the center span on my porch is only 11'. When it snows here, we get the really wet heavy coastal stuff. I don't even look up there now.
If you copied this design with 4x4 posts and 2x6 rafters, then 1x4 cross bracing to attach the vinyl corrugated roofing it would be very light, and shouldn't break the pocket book.
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