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Model #UB-40-P3D-15--47--121

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R-15 Thermafiber UltraBatt Unfaced Mineral Wool Insulation Batt 15in. x 47in.

  • 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
  • See More Details

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Product Overview

Thermafiber fire resistance icon

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.

Thermafiber sound performance icon

Sound Insulation

Outstanding acoustic insulation designed to reduce noise and absorb sound traveling from room to room.

Thermafiber mold icon

Mold Resistant

Mineral Wool is made of an inorganic material that will not promote the growth of mold or retain moisture.

Supplies needed for Thermafiber project

Easy to Install

Thermafiber insulation is easy to install with minimal PPE required.

diagram of Thermafiber install

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.

diagram of Thermafiber Install

Squeeze and Insert

Thermafiber insulation is flexible and pliable; simply squeeze the sides to compress the insulation and insert into the desired wall.

diagram of Thermafiber install

Release and Expand

Once in place, Thermafiber insulation naturally expands to fill in the space, creating a snug, custom fit.

Thermafiber recycled content icon

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.

Thermafiber product with logo

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 package

Thermafiber Fire and Sound Guard

Thermafiber Fire and Sound Guard insulation is designed to provide exceptional acoustical control and fire resistance.

House diagram for Thermafiber Fire and Sound

Where to Install

Thermafiber Fire and Sound Guard insulation is for use in interior walls, floors and ceilings.

Thermafiber UltraBatt Package

Thermafiber UltraBatt

Thermafiber UltraBatt insulation is a dense, semi-rigid batt designed to provide excellent thermal insulation, fire resistance and noise control.

House diagram for Thermafiber UltraBatt

Where to Install

Thermafiber UltraBatt insulation is for use in exterior walls, ceilings, cathedral ceilings, basement walls and crawlspaces.

Therma-fiber UltraBatt 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
  • California residents

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.

Specifications

Dimensions

Coverage Area (sq. ft.)
29
Product Length (ft.)
3.92 ft
Product Thickness (in.)
3.5 in
Product Width (in.)
15 in

Details

Bag Size
3.91 ft. x 24.5 in. x 15 in.
Batt/Roll Size
3.92 ft. x 3.5 in. x 15 in.
Compatible Install Surface
Plywood,Wood
Coverage Area per Bag (sq. ft.)
29.4
Faced or Unfaced
Unfaced
Insulation Features
Fire Block Rated,Friction Fit,Soundproofing Insulation
Insulation Location
2x4 Wall,Ceiling Insulation,Floor
Insulation R-Value
R15
Insulation Type
Mineral Wool Insulation
Number of Bags
1
Pieces Per Bag
6
Pieces per Pallet
0
Product Weight (lb.)
24 lb
Returnable
90-Day
Roll or Batt
Batt

Warranty / Certifications

Warranty Information
3-Year Limited

Questions & Answers

64Questions18Answers

Can this be placed above ceiling tiles in a dropped ceiling to provide sound reduction?

Asked by kurtb April 23, 2021
1
Answer

Hello kurb, Ultrabatt is not rated for use in a plenum so if the area above the drop ceiling is used as an open return air plenum, Ultrabatt cannot be used in this application. Drop ceilings will also have a rating for weight allowed on their tiles. You must verify that Ultrabatt does not exceed that weight limit. Thank you for your inquiry!

does this have the same itch factor as fiberglass

Asked by scotteam April 23, 2021
2
Answers

Hello scotteam, Thermafiber UltraBatt may cause temporary itching due to the mechanical abrasion effects of fibers. When installing we recommend for skin and body personal protection to wear protective gloves and long-sleeved shirt and long pants. Thank you for your inquiry!

If using in a basement, where should the vapor barrier be placed? Between the concrete wall and t...

Asked by Mike April 9, 2021
1
Answer

Hello Mike, The need and placement of the vapor retarder would be based on your location and your local building codes. We suggest checking with your local code office to verify proper placement. Thank you for your inquiry!

Can I squeeze this into a 2.5" space? I want to install 1" polystyrene foam board on the concrete...

Asked by Mike April 9, 2021
2
Answers

Hello Mike, It will be difficult to compress a 3.5" UltraBatt into a 2.5" cavity space. Also compressing the insulation is going to reduce the R-value of the product. Thank you for your inquiry!

Hi, want to use batts of insulation around a hot tub perimeter. Do I need a vapor barrier? Better...

Asked by Larry March 17, 2021
2
Answers

Hello Larry, Owens Corning does not have recommendations on insulating a hot tub. Thank you for your inquiry!

Can I stack up fiberglass and mineral wool together? Should I add anything above the second layer of insulation on the attic side?

Asked by GregC March 13, 2021
2
Answers

Hello GregC, it would be acceptable to install fiberglass batts and mineral wool batts together. If the insulation is not being installed within the studs you may need some additional support such as mechanical fasteners to hold the insulation in place. Thank you for your inquiry!

Can it be used for fireblocking basement walls ?

Asked by tom March 1, 2021
2
Answers

yes

Can it be glued to inside of a metal roof? Any suggestions what adhesive to use?

Asked by Ralph February 27, 2021
3
Answers

Hello Ralph, it is not recommended to be installed using adhesive. It should be friction fitted between framing. If there is no framing an option would be to using impaling pins to support the insulation. Thank you for your inquiry!

Is this product a good alternative for insulating a van as compared to Havelok wool?

Asked by Larry December 24, 2020
2
Answers

Hello Larry, Owens Corning does not have recommendations for the use of building materials like insulation in vehicles. Thank you for your inquiry!

Im looking to insulate a wood framed pole barn that has only a metal sheet shell exterior current...

Asked by Shield December 23, 2020
1
Answer

Hello Shield, Pole barns are not typically designed to be insulated. Owens Corning does not have set recommendations for insulating pole barns because of this. We suggest contacting the manufacturer of the pole barn for their recommendations regarding insulation or there are contractors/companies that specialize in insulating pole barns that you may contact. Thank you for your inquiry!

R-15 Thermafiber UltraBatt Unfaced Mineral Wool Insulation Batt 15in. x 47in. - page 2

Customer Reviews

  • 4.7
    out of 201 reviews
  • 94% recommend this product
Filter by:
Showing 1-10 of 201 reviews
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 ralph
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 AC
2 people found this helpful
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 Matt
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 Michael
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 EagleLakeWoodworking
2 people found this helpful
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 RawFeederMom1
2 people found this helpful
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 Kentucky
Easy to work with,I cut it with a bread knife!
Easy to work with,I cut it with a bread knife!
by Rob
Excellent sound barrier. Very easy to work with. It has met my expectations.
Excellent sound barrier. Very easy to work with. It has met my expectations.
by Rod
bathroom project
Installed R-15 in bathroom wall around shower. Stiffness makes it easy to wedge in between the studs. Best way to cut is similar to a loaf of french bread. Less pressure , more sawing. I actually used a bread knife from kitchen. Handles differently than glass insulation.
by IL76
8 people found this helpful
Showing 1-10 of 201 reviews