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This all brought to mind a lesson in roof construction that a home flipper (for lack of a better term) friend of mine taught me about twenty years back. We were looking at the roof of my 70's era house built with the same inferior toe nailing construction shown in the video, and he showed me the effects of the roof spreading that inevitably occurred. All the drywall ceilings would inevitably crack and need to be repaired and I had no idea why. His solution then was aftermarket steel brackets bolted to the center joists to bolster the joints and prevent spreading, a precursor of sorts to the gang nail plates. Of course the interior walls still had to support all that extra weight, and there really was no solution for the cracks that would induce, especially given the negative effects of evaporative (swamp) coolers, which were used in most homes of that era. Very illuminating.

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