I understand that if one backs up the aluminun with spray polyurethane insulation or even plywood that the ripples and dents are grately reduced.....I'm trying to locate the SPF guy here locally it find out what he knows about this process....the ripples have to do with heating/cooling of the skin while still and flexing of the frame and wind load while moving....I will find out more and report this to you all asap.....geof-Near Cincinnati
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