My dad recently had his 150 year old barn roofed this summer. Three layers of asphalt shingles were removed and 1 layer of cedar shake under the asphalt. They then sheethed the roof with osb.
I am really baffeled what could be causing this irregular “humping” in the shingles. To me, it dosen’t seem as if they forgot to nail an edge of osb. it is too irregular. I can not get a first hand look at this as my dad lives in CT. I told him to go and look to see if it was the osb warping away from the rafters.
One note, he now says the buckels have gone away now that it is winter.
Any thoughts, could it be wrinkels in the black paper???