Wow! Does anyone know more specifics about the structure in the videos?
What are the skins?
What are the specs for the foam?
How big (height and width) are the panels?
What is the temperature differential between the inside and outside? (and the actual temperature of the skins on both sides - though that would require drilling some holes.) But if it's a temperature differential issue, one would suspect that the walls would bow toward the inside... Unless the sun hits that side only in the winter, and iff the exterior wall temp rises significantly above the interior wall temp.
What kind of splines are used? Doesn't appear that there are any posts for point loads anywhere on that wall, which suggests that the load is uniform??
Has the owner taken a straight line (or plumb line) to other similar walls in structure? To see if they bow out as well - might need to check other walls during a different season when the sun is striking another side of the structure.
Is that painted drywall on the inside?
What is the exterior finish?
That turn-buckle would suggest that it isn't a delamination issue. Unless, of course, if that bolt goes all the way through the panel and out to the outer skin.
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