I have this problem with my roof which was just installed 8 months ago. After a 50 mph wind event. I noticed these lines and can not figure out the problem. Sheathing is self-spacing 5/8 zip roof. After inspecting the attic and rafters all the sheathing is laying perfectly flat on the rafters the way they should. No lifting or bulging. Used felt paper under the shingles. Does anyone have any ideas?
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