5-1/2x15 R21 U B94EV 67sf

Decoding the Specs

5-1/2x15: The dimensions. This usually refers to a thickness of 5.5 inches (standard for 2x6 wood framing) and a width of 15 inches (fitting standard 16-inch on-center stud spacing).

R21: The R-value, which measures thermal resistance. R21 is a high-performance rating for fiberglass batts in 2x6 walls.

U (Unfaced): This means the insulation does not have a paper (kraft) vapor retarder attached.

B94EV: Likely a manufacturer-specific product code (often associated with brands like Johns Manville or Owens Corning).

67sf: The total coverage area per bag/bundle (67 square feet).

E-commerce Product Description

High-Performance R-21 Unfaced Fiberglass Insulation Batt

Maximize your home's energy efficiency with these R-21 high-density fiberglass insulation batts. Designed specifically for use in 2x6 wood-framed exterior walls, this insulation provides superior thermal resistance to keep your indoor climate consistent and your energy bills low.

Key Features

Superior Thermal Protection: An R-21 rating offers enhanced energy savings compared to standard R-19 batts.

Precision Fit: Pre-cut at 15" wide for a friction-fit installation in standard 16" on-center wall cavities.

Unfaced (Friction Fit): Perfect for applications where a separate vapor barrier is already present or not required, allowing for easier cutting and installation.

Sound Dampening: Beyond temperature control, the dense fiberglass structure helps reduce noise transfer between rooms.

Technical Specifications

Pro-Tip for your Listing

Since this is an Unfaced (U) product, mention in the "Best Used For" section that it’s ideal for interior walls (soundproofing) or for DIYers who prefer to staple their own poly-film vapor barrier over the studs after the insulation is in place.