Which is better for a DIY attic job?

Both work. Owens Corning is easier to match to existing batts and comes in more widths. Knauf Kraft-Faced saves money if your store stocks the R-value you need.

Is one better for indoor air quality?

No. Both are GREENGUARD certified, which means low chemical emissions. Either is fine for living spaces when installed per the label.

Fiberglass batts from both brands last decades if kept dry and covered. Lifespan depends on moisture control, not the brand.

Is Knauf worth it over Owens Corning?

Yes if the price per square foot is lower for the same R-value. Owens Corning is worth the premium when you need a specific size or a quick match.

Do I need a vapor barrier with either?

Kraft-faced Knauf includes a vapor retarder. Unfaced Owens Corning needs a separate barrier in cold climates; faced versions do not.

Owens Corning Fiberglass Insulation Batt vs Knauf Kraft-Faced Batt Insulation

Both are GREENGUARD-certified fiberglass batts, so the choice comes down to fit and price. Owens Corning is the more widely stocked brand with a larger rating base, which helps if you need to match existing batts or find a specific R-value fast. Knauf Kraft-Faced is a solid alternative and often costs less per square foot. Compare the latest per-bag prices at your local stores before buying, since insulation pricing swings with R-value and pack size.

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