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R-15 Thermafiber UltraBatt Mineral Wool Insulation Batt 23 in. x 47 in. (12-Bags)

$65454
/pallet
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  • Fire and Water Resistant Thermal Insulation
  • Semi-rigid Mineral Wool Batt is Easy to Cut and Install
  • Non-combustible, non-corrosive and non-deteriorating
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Price:
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Product Overview

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Moisture Control

Remains mold resistant by creating an insulation moisture barrier within the wall cavity.

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Fire Resistance

Non-combustible insulation resists fire and temperatures in excess of 2000°F, giving you more time to get out in the event of a fire.

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Sound Insulation

Designed with outstanding acoustic insulation to help deaden noise, provide sound insulation in walls and reduce sound from traveling room-to-room.

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What Is R-Value?

The R-value for insulation measures how well insulation materials can resist heat - the higher the R-value, the greater the insulation performance.

Man with insulation knife and tape measure cutting Thermafiber

Insulation Supplies

Thermafiber can be installed easily and requires minimal equipment.

Man gently placing Thermafiber in wall cavity

Ease Of Installation

Flexible insulation is easy to cut and install, allowing it to conform to building shapes and construction irregularities.

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Brand You Can Trust

Thermafiber is the #1 specified brand* of mineral wool.

Department of Energy recommended R-value map

R-Value Insulation Map

Find your zone on the insulation map.

Department of Energy recommended R-value chart

R-Value Insulation Chart

Now use the R-value table to determine the recommended R-value you need.

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Insulation Calculator

The insulation estimator helps you determine how much insulation is needed to cover the total square footage of your attic, floor and walls.

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Energy Savings

Thermafiber insulation reduces the transfer of heat and cold through building structures to provide thermal comfort and continuous energy saving insulation.

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Make More Possible

Owens Corning is a global leader in engineered materials for roofing, insulation and composites.

Man installing Thermafiber in wall cavity

Smarter Through Science

Our innovative solutions are safe, sustainable, durable, efficient and affordable to address thermal, air, fire and moisture performance.

Thermafiber 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: 3.91 ft. x 3.5 in. x 23 in., 6 pieces (45 sq. ft. / bag)
  • 12 bags/pallet = 72 pieces/540 sq. ft.
  • Energy saving thermal insulation
  • Easy to install
  • Mold resistant
  • Provides fire resistance
  • California residents

Info & Guides

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Specifications

Dimensions

Cover Area Per Bag (sq. ft.)
45 ft²
Coverage Area (sq. ft.)
45 ft²
Product Length (ft.)
3.91 ft
Product Thickness (in.)
3.5 in
Product Width (in.)
23 in

Details

Bag Size
3.91 ft. x 18 in. x 23 in.
Batt/Roll Size
3.91 ft. x 3.5 in. x 23 in.
Compatible Install Surface
Plywood
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
Batt
Number of Pieces
72
Pack Size
4
Product Weight (lb.)
43.38 lb
Returnable
90-Day
Roll or Batt
Batt

Warranty / Certifications

Warranty Information
3-Year Limited

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 4.7
    out of 216 reviews
  • 93% recommend this product
Filter by:
Showing 1-10 of 216 reviews
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
    • Recommended
    4 people found this helpful
    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
    • Verified Purchase
    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
      • Recommended
      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
      • Verified Purchase
      • Recommended
      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
      • Verified Purchase
      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
      • DIY
      • Verified Purchase
      • Recommended
      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
      • DIY
      • Verified Purchase
      • Recommended
      4 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
      • Verified Purchase
      • Recommended
      Easy to work with,I cut it with a bread knife!
      Easy to work with,I cut it with a bread knife!
      by
      • Verified Purchase
      • Recommended
      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
      • Verified Purchase
      • Recommended
      Showing 1-10 of 216 reviews