Which is better for a 2x6 wall?

The Owens Corning R-19. Its 23-inch width and R-19 value suit 2x6 framing, while the Knauf roll is 15 inches wide and R-11, sized for 2x4 walls.

Which covers more area per pack?

The Knauf, at 88.13 sq ft per pack against 75.07 sq ft for the Owens Corning roll.

Is the Owens Corning worth the extra money?

Yes if you need R-19 or sound control. The Knauf has sold as low as $18.98 since October 31, 2026, so it wins on price for small R-11 jobs.

Which is better for soundproofing?

The Owens Corning. It is rated for acoustic as well as thermal insulation; the Knauf listing covers thermal use only.

Do either contain formaldehyde?

Neither adds formaldehyde. Knauf is formaldehyde-free with recycled glass; Owens Corning states no added formaldehyde and no added chemical fire retardants.

Can I install either myself?

Yes. Knauf lists DIY installation at an easy skill level, and Owens Corning's compression packaging is made for simple handling and storage.

Knauf R-11 Kraft-Faced Fiberglass Insulation vs Owens Corning R-19 Fiberglass Insulation

Buy the Knauf roll for cheap, small jobs like patching a 2x4 wall cavity or topping up a floor joist bay, where R-11 and a 15-inch width are enough. Buy the Owens Corning R-19 for 2x6 walls, attics and sound control, where the higher R-value and 23-inch width fit standard framing. The Knauf has traded between $18.98 and $54.99 since October 31, 2026, and the Owens Corning between $40.00 and $49.42, so the Knauf is the budget pick and the Owens Corning the performance pick.

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