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This is kraft faced fiberglass batt insulation rated R-21, sized for 2x6 wall cavities. The dense fiberglass core provides the thermal resistance, and the kraft paper facing acts as a vapor barrier on the warm side of the wall. It suits builders and DIYers insulating open wood-framed walls before drywall goes up. Against unfaced batts it adds a built-in vapor retarder; against mineral wool it is lighter and easier to cut but less dense and less resistant to moisture and fire.
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Lowest price we've seen: $1,749.95 on Nov 4 at VXB.com Bearings. Tracked across 1 store since Nov 4.
This is R-21 kraft faced fiberglass batt insulation made for 2x6 wall studs. It has a dense fiberglass core that provides R-21 thermal resistance. The die cut dimensions also fit 2x4 wood framing.
The kraft paper facing is heavy duty and works as a built-in vapor barrier against moisture. The batts are installed in open wood wall cavities before drywall goes up. The flexible material can be compressed slightly to work around wiring, and the paper flaps are pressed flat against the wood framing.