Paul writes from Saint Petersburg, Florida: "Is the insulation R-19 with the Kraft paper facing with what I think is a staple tab have to be stapled to the studs or can the installer just stuff it between the studs like he has in a lot of places. The walls in the addition are 2x6's."

Answer: No, the flanges do not need to be stapled when the insulation is installed into normal wall cavities that will be closed in on all sides and as long as the insulation fills the cavity completely in depth, width and height. In applications where stapling is needed, like knee walls or walls where the insulation will not fill the space completely, we recommend stapling the product every 8 to 12 inches. Owens Corning also produces a faced product without flanges called PROPINK FastBatt® insulation, which is available in some markets.