Knauf Insulation. With a R-Value of R-30 the insulation will fit into any 2x10 construction board. Kraft Faced. This insulation has a moisture barrier that is used for exterior wall, floor, or attic This insulation is perfect for 4 foot floor or attic cavities. Two bundles of 4 for a total of 8 bags for at total of 554.64 square footage.This product requires coordination on the delivery. A non-encrypted phone number will be required to coordinate delivery. Please be prepared to provide one before the ship date.