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I think that idea would give the allusion of dry walls but the block is still going to condensate between the block and the ply. And then you are going to have mold and mildew problems.
If you were going to finish off the interior wall you should consult a contractor to see what vapor barrier, insulation, etc. you need to do a proper job (safe for your birds).
A vapor barrier wouldn't be a terrible idea between plywood and block wall; but I have to tell you, I have worked in a lot of horse barns with cinderblock walls finished this way (plywood over cinderblock -- both to minimize humidity problems and because a horse kicking directly into a cinderblock wall can incur terrible injuries) and cannot remember ANY having a rot or mold problem. Really, for an unheated outbuilding with decent ventilation it works just fine. (I sure wouldn't do it in a *basement*, but that's different in many ways)
I doubt you do get very much condensation between plywood and cinderblock btw. There isn't *much* of a temperature gradient, b/c the barn is not heated, it's just the difference between the 'latent cold' of the block walls and whatever the air temperature is on a nice spring day, you know? I would bet that plywood's inherent, though low, insulating value, as well as its capacity to buffer temporary changes in humidity (i.e. peaks in coop humidity won't be nearly as extreme on the other side of the plywood) probably reduce condensation in between there quite a lot.
But whatever the mechanics inside that sort of wall, they work FINE for barns, honest.
Pat