Nail and Glue?
Preventing cupping is the reason some manufacturers insist you must also glue any wood flooring 5" wide and wider. Again, consult the manufacturer's instructions to a tee.
BTW, gluing wood floors does not prevent it from moving, wood glues are rubbery and so everything gives and comes back.
I agree pine floors are not very durable, but many people want them for their rustic look.
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