Tar on a flat roof is correct, Shingles are designed for slanted roofs only. Due to their overlapping design the water runs down them without leaking thru, they're not designed to lay flat.
You don't even need that much elevation on the roof. A false roof that is raised one or two feet on one side and slants down to meet the existing roof on the other end will be just enough so water and snow can run off it. It'll be very easy to build and it'll look like a small canopy when you're done. Just add some wood and paint to the sides to fill in the angled space and your golden.
Would you need a permit for that as well?
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'92 Honda CB747-Cafe'
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