SKU: 16273097828

JM (Johns Manville) R-49 Unfaced Fiberglass Batt Insulation, 16 in x 48 in, 32 sq ft

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Ships within 48 hours · Estimated delivery Jul 30 - Aug 4

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Description

JM (Johns Manville) R-49 Unfaced Fiberglass Batt Insulation, 16 in x 48 in, 32 sq ftR 49 Unfaced Fiberglass Batt Insulation JM R 49 unfaced fiberglass batt insulation is designed for wood framed attics, ceilings, and floors to help improve energy efficiency and reduce sound transmission. Pre cut 16 in x 48 in batts fit standard 16 in on center spacing and can be added over existing insulation where no vapor barrier is needed. Key Features: High thermal performance: R 49 fiberglass batts help reduce heat loss and improve overall

R-49 Unfaced Fiberglass Batt Insulation

JM R-49 unfaced fiberglass batt insulation is designed for wood-framed attics, ceilings, and floors to help improve energy efficiency and reduce sound transmission. Pre-cut 16-in x 48-in batts fit standard 16-in on-center spacing and can be added over existing insulation where no vapor barrier is needed.


Key Features:

  • High thermal performance: R-49 fiberglass batts help reduce heat loss and improve overall energy efficiency
  • Unfaced design: No vapor barrier—ideal for layering over existing insulation where appropriate
  • Sized for standard framing: Pre-cut 16-in x 48-in batts for 16-in on-center joist spacing
  • Added comfort: Helps provide sound control in floors/ceilings
  • Indoor air quality focused: Formaldehyde-free and GREENGUARD Gold Certified

Specifications Table:

Specification Details
Brand JM
Category Batt Insulation
R-Value R-49
Insulation Type Fiberglass
Faced/Unfaced Unfaced
Coverage Area (Sq. Feet) 32
Width (Inches) 16
Length (Inches) 48
Thickness (Inches) 13.5
R-Value per Inch 3.63
Maximum R-Value 49
Stud Spacing (Inches) 16
Framing Type Wood studs
Vapor Retardant No
Sound Barrier Yes
Formaldehyde Free Yes
ENERGY STAR Certified Yes
GREENGUARD Gold Certified Yes
Package Type Multi-pack
Package Count 6
Total Package Quantity 24
Multi-Pack Quantity 4
Bag Dimensions (L x W x D) 16.5 x 20 x 49
Package Weight (lbs.) 26.83
For Use in Attics Yes
For Use in Ceilings Yes
For Use in Floors Yes
For Use in Basements No
For Use in Crawlspaces No
For Use in Walls No
Fits 2 x 4 Walls No
Fits 2 x 6 Walls No
For Use in Doors No
For Use in Duct No
For Use in Electrical No
For Use in Garage Doors No
For Use in Masonry No
For Use in Plumbing No
For Use in Vents No
For Use in Windows No
CA Residents: Prop 65 Warning(s) No

Frequently Asked Questions (FAQ):

Q: Where can I use this insulation?
A: It’s intended for wood-framed attics, ceilings, and floors.


Q: Does this batt include a vapor barrier?
A: No—this product is unfaced and does not include a vapor retardant.


Q: Will it fit standard framing?
A: Yes, the batts are 16 in wide and 48 in long for 16-in on-center spacing.


Q: Can I add it over existing insulation?
A: Yes, unfaced fiberglass batts can be added to existing insulation.


Q: Is it formaldehyde-free and certified for indoor air quality?
A: Yes—Formaldehyde Free is listed as Yes, and it is GREENGUARD Gold Certified.


Quiet, cocooning comfort—layered in the bones of your home

Great design is as much about what you feel as what you see—and insulation is the invisible luxury that makes a home serene. These R-49 unfaced fiberglass batts tuck cleanly between joists, elevating comfort with warmth retention and sound-softening ease. Use them to fortify attic and ceiling planes so the rooms below feel calmer, more consistent, and effortlessly livable. It’s the kind of behind-the-scenes upgrade that makes everyday living feel truly elevated.


Upgrade your attic, ceiling, or floor cavities with JM R-49 batts for a more efficient, quieter home.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 16273097828

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★★★★★ 3
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Reviewed in the United States on September 17, 2024
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CWM
Pawtucket, US
★★★★★ 5
As advertised
Husband loved it. Was a 50th birthday gift
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Reviewed in the United States on May 4, 2024
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Deal Hunter
Los Angeles, US
★★★★★ 5
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I already owned two Two Tissot watches before I bought this beautiful watch, both of which I am very satisfied with. I have full confidence this watch will also be of high quality. Tissot uses the same movement and crystals as Swiss luxury watches, yet costs a fraction of the price. That’s makes this and other Tissot watches a bargain in my opinion.
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Reviewed in the United States on May 26, 2026
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Steve E.
Carnegie, US
★★★★★ 5
Tissot + orange = win
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Reviewed in the United States on April 15, 2024
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★★★★★ 5
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