Homeowners often ask if a vapor barrier is necessary for optimizing attic insulation and protecting their homes from moisture-related damage. The answer, however, isn’t one-size-fits-all.
The ability to allow water vapor to pass through radiant barrier materials is not needed for the roof ... and contractors representing 14 products, taken by the Reflective Insulation Manufacturers ...
Commercial grade - 28 lbs (2-3X heavier than some competitors) highly reflective radiant barrier ... strength perforated radiant barrier attic insulation is tear and puncture proof.