Batt Insulation, hmmm?
properly vented attics do not need a vapor barrier and in some climates should not have one…
Phoenix is one of those climates.
that’s true. blown in insulation doesn’t have a vapor barrier either.
“Venting attics in the South was dreamed up by some disgruntled Yankee pissed about the Civil War and wanting to get even. Be sure when insulating at the roofline in humid climates to follow moisture control principles as you would with any insulated wall so that the roof assembly is self-drying (www.buildingscience.com/resources/walls/exterior_sheathing_systems.pdf).”
That is funny!:mrgreen: