ATVer's theory sounds spot on. I didn't get to see the roof being put on while I was there, but there was snow on the ground and it wasn't really cold inside. I did see a bunch of roofs ready to be installed, and they had that overlap that you referred to that is wrapped over the edge and secured. I can definitely see how that stress could cause the roof to lift / bubble a little at the edge. This is what mine's done in a few spots on the edge. Mine was built in the winter months.
Does the roof in fact overlap the side wall? I thought they told me it did. Wish I could've seen that part.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.