Our attic has foam insulation and is fully encapsulated. As part of this project, we removed all of the old cellulose insulation above the ceiling, so now there's nothing between the attic joists except for the ceiling drywall. We plan to put flooring for storage in the attic over the joists using 3/4" plywood.
Is it OK to use nails to secure the plywood? If not, what are the problems with using nails? Is it OK to use any type of nail or will it only work with certain kinds? I may get the help of a handyman who is quoting the job based on nails instead of screws, so I'm trying to decide how big a deal this is.