Bob, I plan on installing solar sometime this year so I might just look for the "Dew outline" on the roof (some early morning) since the Thor info is not very accurate (and the studs seem to be at random spacing).
Plus I have read many times over that owners using screw anchor and / or liquid nail to installing where they want and they dont worry about the stud locations. But it would be nice to hit the studs on some if not most of the srews. Let us know how it works out.
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