Roland --- Excellent question. We're not sure yet.... We're going to start with the walls and see what comes to us in the meantime. The instructions suggest shingles, which are probably the most flexible for this type of application.
Gerry --- No, we're going to go for ventilation instead. In the near future, this structure is only going to be for summer use since it's in heavy shade during the winter (and we have many fewer chickens then). If we do decide to get some kind of larger livestock that overwinters (like sheep), we can decide if it would be worth it to go in and retrofit the coop with insulation.
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