15 in. x 47 in. R-15 Thermafiber Ultra-Batt Unfaced Mineral Wool Insulation Batt
Covers 29 sq.ft. ($24.64 /sq.ft.)
$714.61
Buy 15 or more $607.42 /sq.ft.
Pay $664.61 after $50 OFF your total qualifying purchase upon opening a new card. 
Apply for a Home Depot Consumer Card- R-15 Mineral wool batt can be installed within exterior 2x4 wall
- Easy to cut and install, even around construction irregularities
- Fire resistant, mold resistant and non-corrosive
- View More Details
Product Details
Fire Resistance
Non-combustible insulation resists fire and temperatures in excess of 2000F, giving you more time to get out in the event of a fire.
Sound Insulation
Outstanding acoustic insulation designed to reduce noise and absorb sound traveling from room to room.
Mold Resistant
Mineral Wool is made of an inorganic material that will not promote the growth of mold or retain moisture.
Easy to Install
Thermafiber insulation is easy to install with minimal PPE required.
Measure and Cut
Thermafiber insulation is easy to cut with a serrated knife for custom fitting around electrical boxes, pipes, ductwork, wiring or between nonstandard studs and joists.
Squeeze and Insert
Thermafiber insulation is flexible and pliable; simply squeeze the sides to compress the insulation and insert into the desired wall.
Release and Expand
Once in place, Thermafiber insulation naturally expands to fill in the space, creating a snug, custom fit.
Recycled Content
Thermafiber Mineral Wool Insulation is composed of at least 70% recycled content which means you can help protect your home while protecting the environment.
Benefits of Mineral Wool
Thermafiber Mineral Wool Insulation products are non-combustible, mold-resistant, non-corrosive and non-deteriorating. (ASTM C 1338)
Thermafiber Fire and Sound Guard
Thermafiber Fire and Sound Guard insulation is designed to provide exceptional acoustical control and fire resistance.
Where to Install
Thermafiber Fire and Sound Guard insulation is for use in interior walls, floors and ceilings.
Thermafiber UltraBatt
Thermafiber UltraBatt insulation is a dense, semi-rigid batt designed to provide excellent thermal insulation, fire resistance and noise control.
Where to Install
Thermafiber UltraBatt insulation is for use in exterior walls, ceilings, cathedral ceilings, basement walls and crawlspaces.
Therma-fiber Ultra-Batt mineral wool is designed to provide excellent thermal insulation in residential and light commercial building. The semi-rigid batts are more dense than traditional batts or rolls and are quick and easy to install. UltraBatt products are non-combustible, moisture-resistant, non-corrosive and mold resistant.
- Dimensions: 3.92 ft. x 3.5 in. x 15 in. (6-pieces) (29.4 sq. ft./bag)
- Easy to install
- Mold resistant
- Provides fire resistance
- Unfaced insulation: does not have a vapor retarder
- Flexible insulation is easy to cut and install, allowing it to conform to building shapes and construction irregularities
- Thermafiber insulation reduces the transfer of heat and cold through building structures to provide thermal comfort and continuous energy savings
- Step 1 of installation: measure and cut insulation
- Step 2 of installation: squeeze and insert insulation into desired space
- Step 3 of installation: release and let product expand within the wall
- Shop all Owens Corning Thermafiber Mineral Wool Insulation here
- Click here to learn more about Insulation R-Values
- Return Policy
- California residents
Additional Resources
From the Manufacturer
Specifications
Questions & Answers
75Questions
Q:Can I use this on top of existing batt insulation on an exterior wall
by|Nov 11, 2022
5 Answers
Q:what is the stc rating of brick ext, wood studs 1/2 quiet rock sheet rock and this product?
by|Oct 5, 2022
2 Answers
Q:Hi, Owens Corning. Why isn't the formaldehyde-free Ultrabatt available for retail purchase?
by|Sep 9, 2022
1 Answer
Q:Hello, is this product (thermafiber ultrabatt) formaldehyde free? I don't see it stated anywhere? However, on the Owens Corning website is states it is formaldehyde free... Can a specialist please verify this? Thank you.
by|Feb 16, 2022
1 Answer
Showing 1-4 of 75
Apr 23, 2022
Inferior Product
Got a few bats of this product as Rock Wool wasn't available. What a mistake. This stuff has a noxious rotten egg odor, the insulation media feels sub-par, and to top it off the black glass is not well mixed in so you will encounter big chunks that tear out and try to ruin your knife as you cut it.
I have absolutely no idea why this product has so many five star ratings. I'm hoping the sound deadening is as good as some of the reviews say or it's a waste. The odor is concerning.
by
Response from OwensCorningApr 25, 2022
Dear NotHappy --
I am so sorry to hear about your experience. During the manufacturing process the insulation is cured in an oven. In some cases, the binder is not completely cured and may cause a burnt sugar odor. This odor should dissipate over time. That time can vary depending on the weather conditions. In many cases once the interior finish is installed you will no longer smell the insulation.
Thank you!
Owens Corning
I am so sorry to hear about your experience. During the manufacturing process the insulation is cured in an oven. In some cases, the binder is not completely cured and may cause a burnt sugar odor. This odor should dissipate over time. That time can vary depending on the weather conditions. In many cases once the interior finish is installed you will no longer smell the insulation.
Thank you!
Owens Corning
Sep 8, 2021
5 stars despite awful odor
Mineral wool has terrific advantages over other types of insulation. You can read about them elsewhere so I won’t go into it. This is easy to cut and fairly neat to install. The one major fault I find, and you may not be willing to live with it, is the awful odor. Kind of a sweaty urine if I had to describe it, and six months later it still is apparent.
by
Apr 9, 2021
easy to install recommend buying a insulation knife or...
easy to install recommend buying a insulation knife or use a old bread knife to cut. could see a difference in temperature even before the sheet rock went in
by
Sep 2, 2020
This was very easy to cut using an insulation knife and installed between studs great. In my cas...
This was very easy to cut using an insulation knife and installed between studs great. In my case, some of the studs spacing was not 16" centers so I had to cut the insulation into multiple pieces to get it to fit.
I found you could use the studs as a guide when cutting. For example, I pushed the insulation against the left stud of a pocket and used the inner edge of the right stud as my line to cut along the insulation. This seemed to work pretty well and went quickly.
This was for a bathroom and, except for one exterior wall, mainly for sound reduction and it has definitely worked on that front. I can barely hear the shower running when not in the bathroom. I also noticed that the shower wall tiles don't get nearly as cold as they used to prior to insulating the walls, so an added benefit there.
One minor note is that the insulation has a distinct smell upon opening it. I didn't find it offensive, but I could certainly seeing it bothering someone else. The smell dissipates so it's not like it's a permanent concern.
Overall, very happy with this purchase and would definitely use it again.
by
Feb 22, 2020
Great product installed so easy and don't have to worry about damage from the old plaster walls. ...
Great product installed so easy and don't have to worry about damage from the old plaster walls. the pink that was there was molded and useless. Will be picking up more well worth the extra few bucks.
by
Feb 12, 2020
Did the job used it in the walls of a...
Did the job used it in the walls of a remodeling job. Fire and sound resistant along with R15 was good for us. Easy to work with - Not fiberglass.
by
Feb 9, 2020
I was insulating a garage with 2x4 walls and a 2x8 ceiling. I doubled up the batts in the ceiling...
I was insulating a garage with 2x4 walls and a 2x8 ceiling. I doubled up the batts in the ceiling to achieve R30! This would not have been possible with the other insulation design for a 2x8 cavity.
What I like best about working with this product is that it stays in place. Great friction fit.
The only con is some of the batts were a bit fragile. There was definitely a difference in the resiliency and integrity of a few batts, but most were fine. A couple of batts had to be handled really carefully as they were sort of brittle and crumbling. But like I said most were fine.
I love the fact the batts a designed to fit 2 vertically in a 92-5/8" stud cavity without any cutting. Installing the insulation in the ways went really easy.
I used an electric carving knife for the cuts and this worked wonderfully.
I will never use fiberglass pink insulation again after using this type of insulation. Easier to install, better R value and better fit.
by
Dec 17, 2019
I am a 67 year old female "rustic" DIYer. Was finally insulating an exterior concrete block wall...
I am a 67 year old female "rustic" DIYer.
Was finally insulating an exterior concrete block wall in my laundry room. Put up a stud wall, air barrier, batt insulation (THIS PRODUCT), moisture barrier and drywall. This insulation made an immediate and HUGE temperature difference in my whole basement. Recommend without reservation.
This product was easy to handle and apply. Fit into a standard stud wall as stated. However, when needed to resize, was easy to cut and fit. NON-ITCHING!!!!!
Looked at other products, bought some. Found this product and returned the other stuff. Best decision.
(Pictures are in reverse order. Oops.)
by
Dec 10, 2019
So far I’ve used this product to insulate my garage. The noise from the garage door opening has b...
So far I’ve used this product to insulate my garage. The noise from the garage door opening has been noticeably dampened. I used roxul for my basement. There is very little difference between the products in my own opinion. Take care when pushing Owens into place to avoid fraying (roxul also did this). Others have used plywood for this, I managed with my hands just fine. I’m currently working on my homes exterior walls where standard fiberglass was installed, so I will update on its effect on my homes comfort. At half the price I wish I would have used in my basement. This is a quality product with great sound dampening and easy installation. I will continue to use.
by
Mar 19, 2019
Easy to work with,I cut it with a bread knife!
Easy to work with,I cut it with a bread knife!
by
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