Which is better for 16 in. on-center walls?

The pink R-13 batt. Its roughly 15 in. width fits between studs spaced 16 in. on center. The Knauf 23 in. batt is built for 24 in. on-center framing and would need trimming.

Do both give the same R-value?

Yes. Both are R-13 blanket batts for 2x4 walls, so the insulating performance is the same when installed to the same thickness without gaps.

Is the Knauf batt worth more than the pink one?

Only if the width saves you cutting time. Compare price per square foot at your store; the R-value is identical, so pay extra only for fit or the formaldehyde-free binder.

Fiberglass batts do not wear out in a closed wall. Both last the life of the building if kept dry and covered by drywall. Moisture, not brand, is what ruins insulation.

Can I mix the two in one wall?

Yes. R-13 batts of either brand can sit side by side in the same cavity as long as each fills its bay fully with no compressed edges.

Do both need a vapor retarder?

The kraft facing on both acts as a vapor retarder. Face it toward the heated side of the wall and staple the flanges to the studs.

Knauf R-13 Kraft Faced Insulation vs R-13 Pink Fiberglass Insulation

Both are R-13 kraft-faced fiberglass batts for 2x4 walls, so performance is nearly identical. The Knauf batt is 23 in. wide by 93 in. long, which suits 24 in. on-center framing and standard 8 ft walls with a little trim. The Owings Corning-style pink batt is the common 15 in. width for 16 in. on-center studs. Buy by stud spacing first, then price.

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