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That is called the Catalina smile.
It's not a big deal unless the plywood that is embedded in the joint gets wet. If that is wet then it is a big deal.
There is a ton of information available on the Catalina smile, just search for it and you'll find out how it happens, how to properly inspect it, and what fixes would be necessary.
It's not a big deal unless the plywood that is embedded in the joint gets wet. If that is wet then it is a big deal.
There is a ton of information available on the Catalina smile, just search for it and you'll find out how it happens, how to properly inspect it, and what fixes would be necessary.