Cementious board, the stuff used as backer-board for ceramic tiles, and commonly known as blue-board, cement-board or Fibre-Cement board is just that, fibre-reinforced concrete board.

Picture sheet-rock but made with cement instead of gypsum.

It is rodent resistant because it is so hard they can't chew through it without a LOT of work. It is also really pricey.

We use galvanized tin sheeting a lot, if you use low-profile galv. roofing it is pretty cheap and goes up really easy. It's not bad looking for something like a barn, if you use it to line a shop or something like that you get the added bonus of fire safety and resistance to dirt and bumps from hard objects.

All in all, OSB is also a good choice for a barn, if you want to add to the rodent proof aspect, sprinkle a good amount of rat poison, the sealed pouches are really good, inside the walls anywhere you think they might try to get in before you seal the walls, that way if something tries it won't succeed for long.

Best of luck.

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