Knauf EcoRoll R-13 Unfaced Insulation vs Owens Corning R-13 Kraft Faced Insulation Roll

Both are R-13 fiberglass rolls with 3-1/2 inch thickness and 15 inch width, so they insulate a 2x4 wall to the same level. The real split is the facing and the binder. The Owens Corning roll has a kraft vapor retarder, which suits exterior walls in cold climates where you need a moisture barrier. The Knauf EcoRoll is unfaced and formaldehyde-free, so it is the better pick for interior sound walls, for adding over existing insulation, or for anyone sensitive to itch and dust. Owens Corning carries a 4.6 out of 5 owner rating; Knauf leans on its GREENGUARD Gold and recycled-content certifications.

• Choose the Knauf EcoRoll if you are insulating interior walls for sound, layering over existing batts, or want an unfaced, formaldehyde-free roll that is softer to handle.
• Choose the Owens Corning R-13 Kraft Faced if you are insulating exterior 2x4 walls and want a built-in kraft vapor retarder with a stiffer batt that holds its shape in the cavity.