Which is better for a 2x6 wall?

Both are R-19 and fit a 2x6 cavity. The Owens Corning roll gives more coverage for the money; the CertainTeed roll saves trimming because it is 15 in. wide and adds a kraft vapor retarder.

Is the CertainTeed worth the extra price?

Only if you want the built-in kraft facing and 15 in. width. At $124.73 for 48.96 sq ft versus $48.97 for about 75 sq ft, the Owens Corning is far cheaper per square foot.

Do I need a separate vapor barrier with the Owens Corning roll?

With the unfaced roll, yes. Use a smart membrane, poly, or exterior continuous insulation. The faced Owens Corning versions and the CertainTeed roll include a vapor retarder.

Both are fiberglass and last decades when kept dry and undisturbed. Performance depends on installation and moisture control, not on the brand.

How much does each roll cover?

The Owens Corning roll covers about 75 sq ft. The CertainTeed roll covers 48.96 sq ft.

Owens Corning R-19 Fiberglass Insulation vs Certainteed 15 in. W X 470 in. L X 5.5 in. R-19 Kraft Faced Fiberglass Insulation Roll 48.96 sq ft

Buy the Owens Corning R-19 if you want the most coverage per dollar and an unfaced roll for 2x6 walls. It covers about 75 sq ft for $48.97 at Home Depot as of November 4, 2026, while the CertainTeed roll covers 48.96 sq ft for $124.73 at Home Essentials Direct. Choose the CertainTeed only if you need a kraft vapor retarder built into the roll and a 15 in. width.

Today the Owens Corning R-19 Fiberglass Insulation costs $75.76 less at its best price.

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