Unfaced batt (no paper facing) insulation does not have a vapor retarder. Ideal for insulating interior walls for sound control and re-insulating attics. Available in different thicknesses, R-values and widths to accommodate standard-sizes walls, crawl spaces, attics and more.
Kraft-faced batt (paper facing) insulation has a standard vapor retarder that is easily cut to fit the cavity. This help as a control moisture, mold and draft in exterior walls. Check your local building codes for vapor retarder requirements.