ETD66SS
Platinum Member
No, I see no evidence of ridges. The OSB never got wet and was stored inside then installed after the roof was installed.Is there any sign of ridges forming were the sheet of plywood touches another sheet? I believe the gap is do minimize swelling when the plywood/osb gets wet. With a roof over your decking, and your decking remaining dry, I wonder if you need the gap.
My concern is causing damage to the finish flooring if the radiant heat + humidity make the panels expand.
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