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This is a single roll of Knauf fiberglass batt insulation with a kraft paper facing on one side. It is R13, 3-1/2 inches thick, 15 inches wide and 32 feet long, covering 40 square feet. R13 at 3-1/2 inches is the standard grade for 2x4 exterior walls, so it suits framing cavities, rim joists and interior partition walls in homes. The kraft facing gives it a built-in vapor retarder, which unfaced batts lack, and the roll format covers long runs with fewer seams than short precut batts. It is a commodity product: performance is set by the R-value and fit, and the main trade-off against rivals is that a roll is harder to handle alone than precut batts and must be cut to fit around outlets, pipes and studs.
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This is a roll of kraft-faced fiberglass insulation from Knauf Insulation. It is 3-1/2 inches thick and has an R-value of R13. The facing resists tears.
The roll is 15 inches wide and 32 feet long, and it covers 40 square feet.
