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Old 2017-09-22, 01:25 PM
dvg dvg is offline
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forgot to attach the picture, but I actually think I understand now - while the polyethylene vapor barrier would be sufficient for keeping moisture in the concrete from entering the house, the poly would be very cold in the winter, and condensate would form on it from the warm humid air inside. So I guess the polystyrenes R9 brings up the temperature enough so that that is not an issue.
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