Have this Owens Corning R-23 Stone Wool Insulation 16 O.C.for 2×6 Wood Studs Thermafiber delivered onsite. This unfaced insulatio does not have a vapor retarder. It contributes to energy efficiency with R-values that won’t decrease as the insulation ages. It is mold resistant and provides fire resistance. Thermafiber insulation reduces the transfer of heat and cold through building structures to provide thermal comfort and continuous energy savings. Step 1 of installation: measure and cut insulation. Step 2 of installation: squeeze and insert insulation into desired space. Fire & Sound Guard Plus insulation is easy to cut with a serrated knife for custom fitting around electrical boxes, pipes, duct-work, wiring, or between non-standard studs and joists. Fire & Sound Guard Plus insulation is flexible and pliable. Simply squeeze the sides to compress the insulation and insert into the desired wall. Once in place, Fire & Sound Guard Plus insulation naturally expands to fill in the space, creating a snug, custom fit.