The R-value of batt and rolled fiberglass insulation varies a little by manufacturer. Typically it is in the range of 2.9 to 3.8 per inch. Summarized below 

Higher R-value numbers mean that the insulating material resists the cold or heat R-13, 3 1/2 Inches (+/-), Two-by-four (2x4) stud walls.

What is the R-value of 3 1/2 inch fiberglass insulation? For batt insulation, the R-value of 3 ½ inches thickness is between 10.9-11.9. For loose-fill insulations for attics, the R-value is between 7.7-15.05. For loose-fill insulation for walls, the R-value is between 12.95-and 15.05. For rigid fibrous insulation, the R-value of 3 ½ inches

THERMAFIBER® RAINBARRIER® DARK™. Standout Performance Designed to Blend In. The performance and moisture resistance of Thermafiber® RainBarrier® continuous insulation, now with a black facing, eliminating the need for additional camouflage for field installation in open joint and rainscreen applications.

For example, a wall with 3 ½" fiberglass batting (R-value of 10.8 - 11.9) may have an overall R-value of nearly 14 because Cellulose Fiberglass Insulation To keep your home at a comfortable temperature and for energy-efficiency to help keep your bills lower, ensure that it's well-insulated, including the floors.

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EcoTouch™ Unfaced Insulation is designed to improve the thermal performance 3. Technical Data. R-Value*. Width. Length. Thickness.

insulation at Lowe's today. Shop batt insulation and a variety of building supplies products online at Lowes.com. Batt Insulation Maximum R-Value 30.

The best-rated product in Fiberglass Insulation is the R13 EcoBatt Unfaced Fiberglass Insulation Batt 3-1/2 in. x 16 in. x 96 in. (15 Bags). What are the shipping options for Fiberglass Insulation? Some Fiberglass Insulation can be shipped to you at home, while others can be picked up in store. Can Fiberglass Insulation be returned?

The best-rated product in Fiberglass Insulation is the R13 EcoBatt Unfaced Fiberglass Insulation Batt 3-1/2 in. x 16 in. x 96 in. (15 Bags).

Recommended insulation levels for retrofitting existing wood-framed buildings ; 3, R30 to R60, R25 to R38, R19 to R25.