Reply To: Variation in construction lumber roundover?
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Over the years, I’ve used not that small amount of PAR round-over 45 mm thick Scandinavian construction spruce. The round-over has always been 5 mm. In addition, I have watched the manufacturing process, which is essentially ripping to width and thickness, and then finishing with planing and rounding over – all in one go. For a very short period the result is perfect. Then the warping sets in, starting after the cutting to length (no concern is given to grain direction and tension).
Rounding over after warping has begun will lead to inconsistencies. Perhaps that is what has taken place in your case.
/Sven-Olof