Hello TaskBoy:
OSB is more eco-friendly too because it uses all of the log; there are no slabs cut off. I recommend it for the green effect.
Glenn
No issues - The doors will install after the OSB and before the siding. I would think you would be messed up on any jambs on the inside without the OSB.
Existing ply siding? Dunno. Depends how it was installed and how the windows were installed. If windows were set right to framing then plywood I can see why the guy proposing Hardi wants to do the same. Resetting the windows could be a lot of work. How old are the windows? Maybe this is a good time to replace the windows. Unfortunately this will effect trim and jambs inside. It may be possible to extend the jambs outside but I cant say for sure.
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