Cheaper than exterior ply (at least it used to be) and just as good for a chook house, try Sterling Board (also known as OSB). It's a bit heavier, but if you plan on painting/sealing it, Sterling board is the better bet. Even the most weather-resistant of ply will rot if moisture gets past the invisibly small 'gaps' in the paint (and there will be some, if not immediately, soon), and then can't get out!
Best roofing material is Onduline, on close-spaced battens (the steeper the roof the wider spacing you can get away with, but don't go over 3-4 ft at all, and if it is less steep than a 'typical' house roof, you probably want a bearer every 18 inches - 2 ft of the slope).
Best roofing material is Onduline, on close-spaced battens (the steeper the roof the wider spacing you can get away with, but don't go over 3-4 ft at all, and if it is less steep than a 'typical' house roof, you probably want a bearer every 18 inches - 2 ft of the slope).
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