I’ve changed my mind. I decided to go with 1/2″ plywood rather than 5/8″ for several reasons.
1. The house has to be jacked up on one side. It’s drooping. If I use 5/8″ ply, it won’t bend over top the ‘hump’ in the floor.
2. The house has to be jacked up on one side. When it is, I need a little more flexibility in the structure of the flooring.
3. 5/8″ is too dang heavy. I have to cart it all up to the 2nd floor!
Logic Lumber was good about exchanging it. And there it sits, wait to be used.
Also, the furring continues.