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Description
Johns Manville R-38 Unfaced Fiberglass Batt Insulation, 64-sq ft Coverage, 24-in x 48-in, U366SR 38 Unfaced Fiberglass Attic Batt Insulation, 24x48 in High R 38, unfaced fiberglass batts designed for wood framed attics, ceilings, and floors. Precut 24 in x 48 in pieces provide 64 sq ft of coverage per package and install easily between 24 in on center joists for improved energy efficiency and sound control. Key Features: High Thermal Performance: R 38 batts boost energy efficiency and comfort in attics, ceilings, and floors Unfaced Design: No
R-38 Unfaced Fiberglass Attic Batt Insulation, 24x48-in
High R-38, unfaced fiberglass batts designed for wood-framed attics, ceilings, and floors. Precut 24-in x 48-in pieces provide 64 sq ft of coverage per package and install easily between 24-in on-center joists for improved energy efficiency and sound control.
Key Features:
- High Thermal Performance: R-38 batts boost energy efficiency and comfort in attics, ceilings, and floors
- Unfaced Design: No vapor barrier—ideal for adding over existing insulation where permitted
- Precut Convenience: 24-in x 48-in batts sized for 24-in on-center framing; simple press-in installation
- Durable, Healthy Choice: Formaldehyde-free fiberglass that won’t rot, mildew, or corrode pipes/wiring
- Certified for Indoor Air Quality: GREENGUARD Gold and SCS Recycled Content certified; ENERGY STAR partner
Specifications Table:
| Specification | Details |
|---|---|
| R-Value | 38 |
| Coverage Area | 64 sq ft |
| Dimensions (each batt) | 24 in W x 48 in L x 13 in T |
| Stud/Joist Spacing | 24 in on-center |
| Faced/Unfaced | Unfaced |
| Insulation Type | Fiberglass |
| For Use in Attics | Yes |
| For Use in Ceilings | Yes |
| For Use in Floors | Yes |
| For Use in Walls | No |
| Formaldehyde Free | Yes |
| Sound Barrier | Yes |
| Vapor Retardant | No |
| ENERGY STAR Certified | Yes (program partner) |
| GREENGUARD Gold Certified | Yes |
| Framing Type | Wood studs |
| Length | 48 in |
| Width | 24 in |
| Thickness | 13 in |
| Package Weight | 37 lbs |
| R-Value per Inch | 2.923 |
| Package Count | 8 pieces |
| Package Type | Multi-pack |
| Multi-Pack Quantity | 4 |
| Total Package Quantity | 32 |
| Warranty | 1-year limited |
| UNSPSC | 11162400 |
| Bag Dimensions (L x W x D) | 20 x 20 x 50 in |
Frequently Asked Questions (FAQ):
Q: How much area does one package cover?
A: Each package provides 64 square feet of coverage with eight 24-in x 48-in batts.
Q: Can these batts be installed over existing insulation?
A: Yes. Because they are unfaced (no vapor retarder), they can be added over existing insulation where local codes allow.
Q: Where can I use this product?
A: It’s designed for attics, ceilings, and floors with 24-in on-center wood framing; not intended for walls or masonry.
Q: Is the insulation formaldehyde-free?
A: Yes, it is formaldehyde-free and GREENGUARD Gold certified for indoor air quality.
Q: What is the thickness of each batt?
A: Each batt is approximately 13 inches thick to achieve R-38.
Luxurious Warmth, Effortlessly Layered
Imagine a cocooned quiet settling over your home as these plush white batts disappear beneath your attic joists. Their generous 13-inch loft creates a serene, insulated envelope that elevates comfort and hushes the outside world. Pair with crisp, painted ceilings and natural wood finishes to accentuate the calm, controlled environment they enable. This is the invisible foundation of refined, luxurious living—comfort engineered with elegance.
Upgrade your attic with JM R-38 batts today for immediate comfort, quieter rooms, and long-term energy savings.
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4.4 ★★★★★
Based on 1569 reviews
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Product Reviews
★★★★★ 5
such a good read
Format: Kindle
Madison, Lucas, Grey and Rian were made for each other!!! First time reading from this author and I’m not disappointed!!! Absolutely love the Love in this book and couldn’t ask for a better OV!
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Reviewed in the United States on October 25, 2023
★★★★★ 4
Fluffy and Nice Omegaverse
Format: Kindle
… this would have made 5 stars but for 2 reasons.
A.) there were quite a few typos; misspelled words, missing quotations, “the his” mistakes, and various signs that maybe a proofread would do good.
B.) the writing was quite textbook. Late blooming omega is struggling with her new self, finds a absurdly wealthy pack of alphas, every thing is almost insta-love but she resists, then decides to love herself and let everyone be happy.
Rian was my favourite (obviously the author’s favourite too because he got the most page time) but I wish we could see more of his CEO side? He went to work maybe ONCE the entire time. Gray was supposed to be the “growly one” but he turned out to be puppy dog. Lucas was a genius brainiac doctor - but also super alpha with an aggressive hindbrain with a breeding k*nk?? And then there was no actual “breeding”??
Spice 3/5 - normally omegaverse books are super high on messy smut but this was tamer.
Romance 3/5 - insta-love that was then resisted because of personal hangup’s
Plot 2/5 - weird paced head hopping, showing the same scene from different POV’s that made me feel like it was 2 steps backward, 1 step forward.
Humour 4/5 - there were a dozen lines that genuinely made me chuckle out loud
Would have been five stars but the lack of proofreading and the predictable plot made me unable to get up to ADORED IT level - four stars is still and official ENJOYED IT, y’all. This isn’t a bad rating. The “Club Heat” has intriguing possibilities so I’m going to give the second one a shot.
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Reviewed in the United States on March 31, 2023
★★★★★ 5
Fallen Angels, fae, vampires, oh my!
Format: Kindle
Rating: 4.5 | Spice: 2 (but a good slow-burn)
•
Main Characters: Huntyr and Wolf
•
I couldn’t wait to read this book; there was so much hype about it! And there was no doubt why. I fell in love with the characters and the plot itself. This book is mainly plot driven more than friction driven but it’s easy to follow along with. The characters are fun, easily understood. The main setting is at an academy where both the main characters are going through trials and building strength for the final test, The Transcendent. There are fantastic side characters as well. I loved the camaraderie between Huntyr and her friends. But we don’t like Lanson. 😆
We do have some plot twists that come into play throughout the book. Secrets and betrayal to be seen. I did adore Wolf and Huntyr’s relationship. It was a classic slow burn trope. They didn’t hit it off fast, but in time their feelings grew. I loved their banter, so sexy. Wolf is your next book boyfriend; Huntyr is your next vampire assassin independent bad-a*s female. Themes include loyalty, trust, self-discovery, a true slow burn romance. Side note: book ends on a angsty cliffhanger!
•
Emily, thank you for writing this awesome novel and I cannot wait to devour Book 2, Blood So Brutal! 😍
•
Happy reading, my lovelies! xo
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Reviewed in the United States on January 21, 2024
★★★★★ 4
“My heart bows to you and you only, Huntress.”
Format: Kindle
3.5 🌟
This book popped up in my KU recommended reading suggestions and the synopsis sounded like what I was in the mood for. I'm so glad I took a chance on it. I went into this knowing absolutely nothing about it and ended up really liking it. I love when this happens.
The main characters are likeable and I easily found myself rooting for them. There is a mystery element to each of their backstories that I enjoyed watching unfold and can't wait to get more of. Wolf, in particular, has me fixated. Love him.
I found this to be an entertaining, addictive read with a plot that moves along at a good pace. It reads so easily I found myself very reluctant to put it down. Lots of twists and turns and the angst is there. A good set up for the next book to come, for sure.
My issues with this book....the dialogue feels a bit juvenile at times and there is a repetitive over use of a particular word phrasing that I found myself giving the ole eye-roll to. There are, without a doubt, some pretty cliche moments that gave me a bit of the cringe. I think this could've certainly 100% benefited from more depth regarding the world building. Perhaps the world building was sacrificed to keep the pacing quick? Just a guess. Also, the lack of consistency of character for the FMC was really evident and so she feels quite illogical at times.
Overall, this was a fun and enjoyable read that hit the spot well enough for me. That ending certainly has me impatiently pining for book 2!
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Reviewed in the United States on June 18, 2024
★★★★★ 3
Interesting take on the genre
Format: Kindle
True rating: 3.25 ⭐️
I enjoyed the fresh take on the genre. The best way I could describe the setting and world is an apocalyptic dystopian version of Farie where vampires, fae, and angles struggle to survive in what is left of the world. It was definitely interesting throwing the academy/hunger games aspect into this world as well.
Even though I guessed the final reveal early on in the book, I kept hoping I was wrong, and it would take a surprising turn. While the "plot twists" were a bit predictable to me, I still enjoyed the ride this book took me on.
Another downfall for me was the plot holes in the world building... I.E. if society has fallen and the world is in the aftermath of war, how are there trains running around the world? Just to take young adults to the trials to get into the golden city? How is the train maintained, the tracks clear, etc?
However, I did enjoy the FMC & MMC and thought they were fleshed out nicely. I also enjoyed the side characters but wish some were developed more like Ashalin (sp?). I do find myself rooting for the MCs to succeed and find happiness together, which is obviously an important aspect for romantasy.
Overall, was this an earth-shattering, mind-bending, terrific piece of literature? No. But was it the worst thing I've read this year? Also, no. This book has, to me, the bones of a great read & just needs a bit more to push it from an alright book to a great book.
Overall ratings:
Plot- 3.5⭐️
World building 3⭐️
Spice 2.5 🌶🌶
Main characters 4 ⭐️
Supporting characters 3.5⭐️
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Reviewed in the United States on May 12, 2024