SKU: 27586877297

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

Sale price$76.20 Regular price$84.67
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Ships within 48 hours · Estimated delivery Jul 25 - Jul 30

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Description

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:

R-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: 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.

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: 27586877297

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4.8 ★★★★★
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Max
Boise, US
★★★★★ 3
Quality and Reliability - Hit or Miss
Color: Brown
Update: I went ahead and bought this watch again. Like many other Timex watches I’ve had in the past, the first one was faulty but I decided to roll the dice again. I needed a beater solar watch for when I go hiking, camping, etc. There are several options out there—Vaer, Casio, Citizen. I liked the look of Vaer, but their solar offerings are overpriced, IMO. The Citizen watches priced similarly to this Timex are too big and don’t offer sapphire. Casio’s analog watches have the same issue. There is their Edifice watch, but I don’t like integrated bracelets. So Timex it is again. 36mm, sapphire, solar powered, 100m water resistant, a field watch, it has what I'm looking for. And this second time around, it's been good so far— it's been reliable and accurate. So, it’s the luck of the draw with these watches. It’s one of the more attractive Timex watches, too. If I hadn't had a prior bad experience with this watch, I would give it 5 stars. But due to the inconsistency in quality, I can’t rate it higher than 3 stars. Original review: I wanted to add a solar powered watch to my collection. So, after some research, I decided to buy this one. It had great specs—sapphire crystal, 100m water resistance, solar powered (of course), looked good in pictures. A perfect grab-and-go-anywhere watch. It was love at first sight when I got this watch; It was seeming like a great bang-for-buck product… That is, until I looked at it as a timekeeping device—its primary purpose. I compared it to my other watches and noticed it was 4 seconds behind. I thought maybe I had set the time wrong, so I corrected it. A few days passed, and again it was several seconds behind. I repeated this process a few more times, same results. So here’s the problem: this watch doesn’t keep good time. More specifically… This QUARTZ watch doesn’t keep good time. Derided by watch collectors as having no soul, accuracy is a quartz watch’s most redeeming quality. It may lack soul, but you can’t say it doesn’t excel at timekeeping; it wipes the floor with mechanical watches in that department. But this quartz watch doesn’t do that. At least the one I got didn’t do that; your results may vary. But this is the third Timex in a row that I’ve bought that cost over $100 that had some kind of major defect… Three times in a row.. I can’t rationalize buying a Timex anymore. At least not at the higher price range. Luckily, Amazon has a good return policy.
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Reviewed in the United States on June 9, 2024
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Verified Purchase
Kaleris
Louisville, US
★★★★★ 5
Very versatile
Color: Brown/Black
Fantastic watch, as long as it's exposed to some light will never run out. I have expensive watches as well, but I end up coming back to this one frequently as it's dressy enough, and small enough to fit well under motorcycle gloves. Sapphire glass at this price point is really great as well.
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Reviewed in the United States on August 8, 2025
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Beatriz Hernandez
Battle Creek, US
★★★★★ 5
Camisa
Espectacular tela y ajusta perfecto a la taya
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Reviewed in the United States on June 6, 2026
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Renata
Whiting, US
★★★★★ 5
Good quality!
True to size. Pleased with purchase.
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Reviewed in the United States on May 2, 2023
T
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Tom
Belleville, US
★★★★★ 4
Excededd my expectations for the price!
Honestly haven't worn it out yet but I tried it on and this shirt fits and is made nicer then some 100 dollar shirts!
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Reviewed in the United States on April 11, 2024

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