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Oh for sure use plain (non-p/t) exterior-grade plywood. (Do make sure it is EXTERIOR). P/t is totally unnecessary for siding. If you like the look of the grooved T-111, you can always paint lines onto your plain plywood...
Or, if you want a temporary fix, and there will be no mammalian livestock in this enclosure, you could just screw some of that spare roof tin you mentioned over the deteriorated spots, and save up for actual T-111 if you really have your heart set on it. (Personally I like plain plywood better, it is a bit more durable, but <shrug> nothing *wrong* with T-111)
If you were going to just patch it for now and wait a year or two to do a tearoff and replacement, it would not be a terrible idea to splash some paint on the OSB. Doing it now won't do AS much good as it'd have done to paint it when first built, but if it may be A While before the walls are replaced, paint can still extend the life of the OSB even now. Any kind of discarded mistint is fine. If you can find some free leftover primer, you can use that instead or mix it with leftover/mistint paint, it will adhere somewhat better and give as good protection.
Those garage door pieces look quite useful but probably not for this project, save 'em for where you can really do them credit
Good luck, have fun,
Pat
Thanks Pat! No other mammals out there, it will just be our 10 chickens. I really don't care for the T111 enough to pay more for that, so I'll plan on saving up for the exterior grade plywood. Our neighbor is about to spend quite a bit replacing some faulty T111 siding on their house, so I wouldn't be so keen on running out to buy a bunch of that (although I may grab any useful scraps they don't want when they tear theirs off).
My dad just picked up some more roofing yesterday from someone he knew at the dump who was about to toss it in the construction dumpster. I think we will plan on adding the metal roofing to the lower sides and I'll pick up a good exterior primer/sealer to give the OSB a bit more protection until we can replace it next year.