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home > Johns Manville R-30 Unfaced Fiberglass Batt Insulation, 56.83-sq ft Coverage (15.5-in W x 48-in L) – U1323S > Johns Manville R-30 Unfaced Fiberglass Batt Insulation, 56.83-sq ft Coverage (15.5-in W x 48-in L) – U1323S

Johns Manville R-30 Unfaced Fiberglass Batt Insulation, 56.83-sq ft Coverage (15.5-in W x 48-in L) – U1323S main image 0

Johns Manville R-30 Unfaced Fiberglass Batt Insulation, 56.83-sq ft Coverage (15.5-in W x 48-in L) – U1323S main image 1

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Johns Manville R-30 Unfaced Fiberglass Batt Insulation, 56.83-sq ft Coverage (15.5-in W x 48-in L) – U1323SR 30 Unfaced Fiberglass Batt Insulation, 56. 83 sq ft Johns Manville R 30 unfaced fiberglass batts deliver high thermal performance for attics and ceilings with standard 16 in on center framing. Pre cut 48 in lengths press in place for fast installation, improving energy efficiency and sound control without a vapor barrier. Key Features: High R Value Performance: R 30 fiberglass batts help reduce energy costs and improve comfort Ready to Install Size:

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R-30 Unfaced Fiberglass Batt Insulation, 56.83-sq ft

Name: Johns Manville R-30 Unfaced Fiberglass Batt Insulation, 56.83-sq ft Coverage (15.5-in W x 48-in L) – U1323S
Brand: www.midwoodautocraft.com
SKU: 70239097730
Price: 84.67 USD
Availability: InStock
Rating: 4.7011 (1814 reviews)

Johns Manville R-30 unfaced fiberglass batts deliver high thermal performance for attics and ceilings with standard 16-in on-center framing. Pre-cut 48-in lengths press in place for fast installation, improving energy efficiency and sound control without a vapor barrier.

Key Features:

High R-Value Performance: R-30 fiberglass batts help reduce energy costs and improve comfort
Ready-to-Install Size: Pre-cut 15.5-in x 48-in batts fit 16-in OC framing; press-in-place install
Unfaced Design: No vapor barrier—ideal for adding over existing insulation
Health & Safety Certifications: Formaldehyde-free, GREENGUARD Gold and SCS certified
Durable Composition: Will not rot or corrode pipes, wiring, or metal studs

Specifications Table:

Specification	Details
Coverage Area	56.83 sq ft
Batt Dimensions	15.5 in W x 48 in L
Thickness	8.25 in
Faced/Unfaced	Unfaced
Insulation Type	Fiberglass
R-Value	R-30
R-Value per Inch	2.9268
Stud Spacing	16 in OC
For Use in Attics	Yes
For Use in Ceilings	Yes
For Use in Floors	Yes
For Use in Walls	No
Formaldehyde Free	Yes
Framing Type	Wood studs
Vapor Retardant	No
GREENGUARD Gold Certified	Yes
ENERGY STAR Certified	Yes (program partner)
Package Type	Multi-pack
Package Count	11
Total Package Quantity	11
Bag Dimensions (L x W x D)	16 x 20 x 50 in
Package Weight	31.03 lb
Sound Barrier	Yes
Fits 2 x 4 Walls	No
Fits 2 x 6 Walls	No
CA Prop 65 Warning	No
Warranty	1-year limited
UNSPSC	11162400

Frequently Asked Questions (FAQ):

Q: How much area does one package cover?
A: Each package covers 56.83 square feet.

Q: Where can these batts be used?
A: They are designed for attics and ceilings and can also be used in floors with 16-in on-center framing; not for walls or masonry.

Q: Do these batts include a vapor barrier?
A: No. They are unfaced, so there is no vapor retarder and they can be added over existing insulation.

Q: What are the dimensions and thickness?
A: Each batt measures 15.5 in W x 48 in L with an 8.25-in thickness.

Q: Are there any certifications?
A: Yes—ENERGY STAR partner product; GREENGUARD Gold and SCS recycled content certified; formaldehyde-free.

Cocoon Your Home in Quiet, Efficient Comfort

This R-30 fiberglass batt nestles into your attic bays with a crisp, tailored fit, instantly softening acoustics and stabilizing temperature. I love its clean, unfaced profile—streamlined and versatile for layering over existing insulation. Pair it with matte-black attic hardware and tidy wire management for a polished, thoughtful upgrade. It’s a discreet essential that elevates everyday living with luxe comfort and efficiency.

Upgrade your attic with JM R-30 batts today for a quieter, more energy-efficient home.