JM R-13 Kraft-Faced Fiberglass Insulation Roll vs Knauf EcoRoll R-13 Unfaced Insulation

Both are R-13 fiberglass rolls at 3-1/2 in. thick and 15 in. wide, so they insulate a 2x4 wall cavity to the same level. The real split is the facing: the Roll R-13 has a kraft vapor retarder for exterior walls and moisture control, while the Knauf Ecoroll is unfaced, softer to handle, and made with recycled content. Buy the Roll R-13 for exterior walls and damp spaces; buy the Knauf for interior sound walls, attics and anyone who hates itchy fiberglass.

• Choose the Roll R-13 if you are insulating exterior 2x4 walls or any cavity that needs a vapor retarder, and you want a faced roll that goes up in one step.
• Choose the Knauf Ecoroll if you are doing interior walls, floors or ceilings for sound control, or you want a less itchy, formaldehyde-free roll with recycled content.