Knauf Insulation R-13 EcoRoll vs Johns Manville R-13 Kraft-Faced Insulation

Both are R-13 kraft-faced fiberglass rolls for 2x4 walls, so thermal performance is a wash. The Knauf EcoRoll uses ECOSE binder, which owners and installers describe as softer, lower-dust and less itchy than conventional fiberglass, and it comes in a longer 62.5-ft roll. The Johns Manville B1284 is a straightforward 32-ft roll, US-made, with the same formaldehyde-free and GREENGUARD Gold credentials. Buy Knauf for comfort during install and fewer seams on long walls; buy Johns Manville for a simple, proven roll in short runs.

• Choose the Knauf EcoRoll if you want a softer, lower-dust install and a longer roll that covers more wall per piece.
• Choose the Johns Manville B1284 if you want a basic, US-made 32-ft roll for standard 16-in on-center walls and short runs.