Can anyone provide information to help me with with the following:
A builder in a mountain region of the Northeast insulated a homes’ cathedral ceilings in the following way. From the inside of the house he installed 1" foamboard up against the underside of the roof sheathing. Then he installed the duravent foam baffle (that helps maintain the gap for airflow) under (and up against) the foamboard. He then installed fiberglass insulation with kraftface and then the drywall. Isn’t this a dbl vapor barrier? Why would he do this? Is this common??? I think i was successful in attaching a photo that might help you understand what i’m describing.
