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Would it make sense to put a vapor barrier over plyboard?

April 26, 2017barrier plyboard sense vapor

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Would it make sense to put a vapor barrier over plyboard?

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Melissa writes from Canada: “I have a 70 year old house. There is insulation behind the plyboard walls, but there is no vapor barrier on the insulation. I am drywalling all the walls. Would it make sense to put a vapor barrier over the plyboard and then put the drywall on?” Answer: In this situation I recommend using a vapor barrier paint.