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Big logs will keep out the cold if well chinked simply because of sheer mass I would think, if I recall physics correctly. They probably put in the layer of sheet rock next to the logs as their version of a vapor barrier of sorts would be my thinking. Having ‘wrapped’ stuff I can’t see how it would be easy to use standard vapor barrier/wrap on a log wall. And as Malgus said, that layer is probably OSB or something for the moisture repelling qualities. Don’t know if they use the spray foam stuff nowadays directly on interior logs or not although can’t see why you couldn’t