ROCKWOOL Comfortbatt R30 vs Rockwool Comfortboard 80 R-6 Board

These are not interchangeable products. Comfortbatt R30 is a thick cavity batt for 2x8 wood-stud walls; Comfortboard 80 is a 1.5-inch rigid board for continuous exterior sheathing. Buy Comfortbatt for the stud bays and add Comfortboard outside if you want to cut thermal bridging. Owners and installers rate Rockwool for fire performance and moisture tolerance; both are dense and heavy, and Comfortbatt's 7.25-inch thickness needs deep framing.

• Choose the Comfortbatt R30 if you are filling 16-inch or 24-inch on-center wood stud walls and need a high R-value in the cavity.
• Choose the Comfortboard 80 if you need rigid exterior continuous insulation over sheathing to break thermal bridging and let walls dry outward.