Yes it is new osb. Purchased in January. However, I have a buddy in the garage coating business that is going to come help me coat the underside before I lay it down. I like the t and g factor, but maybe MDO (marine plywood) would be better. I do plan to use MDO for my storage boxes. I thought mdo was really expensive, but after checking with my cabinet wood supplier it about $30/sheet. What do think Geof? Keep the osb or go with the mdo? Maybe I'll take a piece like you did and see if it has the new waterproof glue.
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