Didn't anyone notice the painted lines on the decking in the photo???????

The manufacturer has a stamp on each panel stating that the opposite (smooth) side should be down. I don't lnow why anyone would instal it with the smooth (slicker) side up as it would make it unsafe for the roofing installer. The manufacturer coats one side with a vapor barrier coating and installing with the wrong side out could allow for internal rot of the OSB itself.

Regardless of the reason, the manufacturer DOES tell you which side to place to the up.



Also, is that a rafter repair to the right of the incorrectly installed OSB?

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