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putting down 3/4 hardwood flooring

i see info for hardwood flooring on top of OSB plywood.I have a OSB 5/8 t&g subfloor. want to put a 3/4 hardwood floor on top.I was thinking of putting 1/2 inch plywood,glue and screw to 5/8 OSB sub floor so the nail will hold better.I see some people recommend staples instead. Am i over kill with glue?do you recommend gluing ply to OSB? Iam doing a 1600 sq house for sister in law as a favor and want it done proper. thank you for your advice.

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