Insulation, Radiant and Vapor Barriers - Tongue & groove vapor barrier

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rogro
02-21-06, 05:12 PM
Im getting ready to install a tongue and groove ceiling (yellow pine) in my new home. I was told by the lumber supplier that it was not necessary to install a vapor barrier above the pine T&G boards. Is this true since the boards will have blown in insulation above them???? seems backwards to me,, I was going to use 6 mil plastic vapor barrier stapled to the ceiling rafters,,, what should I do??? thanks ron

Concretemasonry
02-21-06, 05:32 PM
You definitely need a vapor barrier on the warm side of the insulation. Wood is not a vapor barrier and tongue and groove makes it even worse when it shrinks and shifts.

Dick
em69
02-22-06, 09:24 AM
Install the 6mil.