Padgett -
The term "frame" is a bit misleading. My understanding is that the floors are, and always have been, framed with wood. You can see it in one of the factory videos. That's where the weight is. When we talk about reframing, we are referring to the frame along the lower edge of the shells, and up around the perimeter of the shells. In the old days, all this was framed with 1x1 square hardwood sticks. In the early 2000's the hardwood sticks were replaced with 1x1 square aluminum tube. The difference, of course, is that if water gets inside the wall from a roof leak, the hardwood will soak it in and rot. The aluminum doesn't.
I can't imagine that there is much weight difference between a foot of hard wood and a foot of aluminum tube of the same dimernsions, so the overall impact of "reframing" is probably negligible in the grand scheme of things.
I may be wrong in some of the minor details of the above, but you get the picture.
Bill
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