Knotty pine T&G for Cathedral Ceiling
I am rehabbing a ranch house and considering a knotty pine T&G cathedral ceiling for the living room. The insulation above this room will be either fiberglass or mineral wool batts in the rafters and 6″ of polyiso screwed onto the deck. There is a second set of rafters above the polyiso insulation that will be vented from the soffits to the ridge and steel roofing is being used as the roof material.
Should I put a layer of polyethylene sheeting between the batts and the knotty pine, or just install the knotty pine underneath the batts?
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