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Description
Johns Manville R-30 Unfaced Fiberglass Roll Insulation, 31.25-sq ft (15-in W x 25-ft L) – B390R 30 Unfaced Fiberglass Roll Insulation, 31. 25 sq ft R 30 unfaced fiberglass roll designed for wood framed attics and ceilings. Delivers high thermal performance with sound control, covering 31. 25 sq ft per roll at 15 in width and 25 ft length. Key Features: High R Value Performance: R 30 insulation improves energy efficiency in attics and ceilings Unfaced Fiberglass: Ideal for adding to existing insulation; wont rot or mildew Easy Fit for Joists:
R-30 Unfaced Fiberglass Roll Insulation, 31.25-sq ft
R-30 unfaced fiberglass roll designed for wood-framed attics and ceilings. Delivers high thermal performance with sound control, covering 31.25 sq ft per roll at 15 in width and 25 ft length.
Key Features:
- High R-Value Performance: R-30 insulation improves energy efficiency in attics and ceilings
- Unfaced Fiberglass: Ideal for adding to existing insulation; won’t rot or mildew
- Easy Fit for Joists: Sized for 16-in on-center wood stud spacing; press in place
- Health & Air Quality Certifications: Formaldehyde-free and GREENGUARD Gold Certified
- Durable Construction: Noncorrosive to pipes, wiring, and metal studs
Specifications Table:
| Specification | Details |
|---|---|
| Coverage Area (Sq. Feet) | 31.25 |
| Length (Feet) | 25 |
| Width (Inches) | 15 |
| Thickness (Inches) | 10.25 |
| Faced/Unfaced | Unfaced |
| Insulation Type | Fiberglass |
| Maximum R-Value | 30 |
| R-Value per Inch | 2.9268 |
| Framing Type | Wood studs |
| Stud Spacing (Inches) | 16 |
| For Use in Attics | Yes |
| For Use in Ceilings | Yes |
| For Use in Walls | No |
| For Use in Basements | No |
| For Use in Floors | No |
| For Use in Crawlspaces | 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 |
| Formaldehyde Free | Yes |
| Reflective | No |
| Sound Barrier | Yes |
| Vapor Retardant | No |
| ENERGY STAR Certified | Yes |
| GREENGUARD Gold Certified | Yes |
| Package Type | Individual pack |
| Package Count | 1 |
| Total Package Quantity | 1 |
| Warranty | 1-year limited |
| Bag Dimensions (L x W x D) | 15 x 15 x 22 |
| UNSPSC | 30141500 |
Frequently Asked Questions (FAQ):
Q: Can this be used in walls or basements?
A: No—this unfaced roll is intended for attics and ceilings and is not rated for walls or basements.
Q: What joist spacing does it fit?
A: Designed for 16-inch on-center wood studs.
Q: Is a vapor barrier included?
A: No, it is unfaced and not a vapor retardant.
Q: How much area does one roll cover?
A: 31.25 square feet per roll (15 in W x 25 ft L).
Q: Is it certified for indoor air quality?
A: Yes, it is formaldehyde-free and GREENGUARD Gold Certified.
Quiet comfort with clean, modern performance
This R-30 roll cocoons the attic in a soft, cloudlike layer that hushes ambient noise and stabilizes temperatures. Its unfaced profile slips seamlessly between joists, keeping the architecture clean and unobtrusive. Pair it with crisp white ventilation covers and matte black hardware for a refined, utility-chic look. A smart, luxurious foundation for homes that value comfort and efficiency.
Upgrade your attic with R-30 performance today and start saving on energy bills season after season.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.8 ★★★★★
Based on 1630 reviews
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Product Reviews
★★★★★ 3
Great, for the most part
Size: 24"X24"
Love it overall and super glad I chose this one after looking at so many.
Pros:
- Perfect size for what I needed. Fits exactly in the space it was planned for
- Fits 22x22 pee pads nicely (which are easily accessible and cheaper than other sizes)
- the color is a brighter blie than I was expecting and shinier in person, which I like very much :)
Con:
I didn't realize that it's actually 4 pieces.
2 for the top, 2 for the bottom, and you have to put them together.
- I like the little weight distribution pieces they have so it keeps the top from sinking down onto the pee pad.
A few problems with that:
- I'm pretty great at putting together furniture, but for some reason one level connected fine and the other just would not go. I ended up using a flat head screwdriver to pry a piece out so it would go over the other. (If you buy it, you might understand what I mean better lol)
- with it coming in 4 pieces instead of two, it's less structurally sound and tends to bow in the middle. Even more so because they put both middles parallel instead if perpendicular.
- there are potty pads in there, but the seams create a more likely scenario of dripping onto my floor. Where I wouldn't have to worry about that with a solid piece.
- I may have to take the whole thing apart to clean between the individual pieces and this may cause it to be less secure over time due to taking apart and putting back together over time.
Great little thing overall and glad I got it :) serves it's purpose
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Reviewed in the United States on February 7, 2025
★★★★★ 5
Works Perfect!
Size: 24"X24"
Same scenario here as a lot of other reviewers... We've got a 10-week-old pup that used potty pads at first... But now is in the teething and let's tear everything up stage. It was starting to get dangerous even with other holders she was tearing up the pads completely and we were worried she was going to ingest them.
We looked at several different products, including the over twice the cost metal wolf brand. But I have to say, really glad we went with this one. It does take a minute to snap together properly, but once you do changing out pads is a breeze.
Once our girl (Mini Poodle) went on top of the greats and used the bathroom we gave her a big reward with lots of praise and a treat. She hasn't been able to tear it up at all. And I believe since she can smell her marking, she has been going back and using it about 7/10 times.
More recently, the success rate has been going up. Like I said, she hasn't been able to flip it over, break it apart etc. So we are incredibly happy with this purchase and has made our lives so much easier.
Once she gets bigger we will see how she handled it. And if she is able to break it apart. But I doubt it, there is a fairly satisfying click when you lock in both sides with the pad beneath.
We are using Frisco pads from Chewy large size and they fit pretty much perfectly. You have to fold the blue border slightly but it works great!
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Reviewed in the United States on November 3, 2024
★★★★★ 5
Our German Sheppard loves these
Size: Medium
These cost a bit more than tennis balls, but they are so much nicer and longer lasting. For starters, they stay cleaner than tennis balls because they’re smooth rubber. Dirt won’t build up on them and if anything does stick, like grass or soil, it falls off once the dog slobber dries. They’re also thick, so they don’t fall apart or blow out like a normal tennis ball does in our dog’s jaws after 30 seconds. Our GS chomps on these like crazy and the only damage they’ve suffered is a crack that developed from the edge of the hole, but the crack is growing very slowly and none of these balls have totally failed yet. The balls do whistle when thrown ant high speed and that may help a dog track and locate it, but I’m not sure. Our neighbors hear the whistling too so it’s far from silent. Lastly the orange ball is easy to locate out in our yard, but the dark blue practically disappears.
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Reviewed in the United States on April 6, 2025
★★★★★ 5
Great for smaller dogs
Size: Small
These two balls are perfect for the smaller mouthed dog that loves to play fetch.
These balls are not only super durable (lots of teeth biting), but float in the baby pool we use for our miniature dachshunds.
The value here is much better than you’d find anywhere else. The noise, if bitten hard enough, was “low” at best. Easy to spot/find if overthrown. Will definitely buy again once these are in bad repair; so far, so good-love these for my fur babies!
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Reviewed in the United States on October 8, 2024
★★★★★ 5
My dogs favorite balls
Size: Medium
These are great for my dog who always has to have a ball in her mouth. Not too hard so I don't have to worry about her teeth. They last for ever. They do lose their shape a little over time (like I said, she always has a ball in her mouth) they become a little oval in shape. They still bounce, she still chases it and she still chews on it so I don't think she notices or cares. I've gotten her a bag full of these over time and I have only seen one that she chewed a chunk out.
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Reviewed in the United States on September 28, 2023