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Glue and screws, the trowel on type. The more glue the more chance of adhereing. Esentiall you are making a thicker piece of plywood gluing them togteher. The screws are really on there to hold tight until the glue sets.
You need the glue to ensure you don't get any movement and this squeeks. Just screws can loosen over time causing squeeks.
A barrier between the ply and the wood floor also prevents squeeks. Old school is 40lb felt/tar paper.
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