Doesn't look professional, what surface finish are you going to use?
Those look like roofing felt that you use under, for example, roof tiles. If you are going to have felt as the only surface layer, I learned that you must have surface felt on the underlay felt because underlay felt is broken down by UV light. Surface felt has a surface of small slate gravel that reflects away UV light. If the roof looked like in the picture, I would have rolled out a few rolls of surface felt lengthwise, and it would look much nicer.
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