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R-38 EcoBatt Kraft Faced Fiberglass Insulation Batt 12 in. x 24 in. x 48 in.

Covers 64 sq.ft. ($1.48 /sq.ft.)
Buy 15 or more $80.75 /sq.ft.
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  • R-38 faced fiberglass insulation pre-cut for ceilings & attics
  • Provides temp. control, sound absorption and moisture mitigation
  • Natural colors, eco-friendly formaldehyde-free, recycled content
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Return this item within 90 days of purchase. Read Return Policy

Product Details

Knauf R-38 EcoBatt Kraft faced fiberglass insulation with ECOSE Technology is a leading sustainable insulation. All of our batts are bonded with the revolutionary, industry-transforming, plant-based ECOSE Technology. They are validated by UL Environment as formaldehyde-free and they contain no Red List chemicals. Made with a high degree of recycled glass, our insulation batts are pre-cut to install quickly and easily with low dust and low hassle. Our kraft facing is durable, resists tears and is marked in 1 ft. increments to streamline installation. And like every Knauf Insulation batt, EcoBatt is resilient and recovers quickly out of the package for a snug fit. Install Knauf Insulation in your home and stay comfortable year-round. (Recommended use includes vaulted ceilings and attic spaces.)
  • R-38 insulation is best used for application in attics and cathedral ceilings
  • Each R-38 fiberglass insulation batt is 12 in. D x 24 in. W x 48 in. L
  • Each individual bag covers 64 sq. ft. of R-38 insulation
  • R-38 R-value improves personal comfort in your home or office
  • R-38 insulation has high-quality materials made of resilient fibers for more energy efficiency and is ENERGY STAR rated
  • Installation made fast and easy using pre-cut, softer to the touch insulation that has durable kraft facing marked in 1 ft. increments with stapling flange where cutting and splitting is simple with low dust
  • R-38 insulation compression packaging fits more product in every bag and is designed to last the life of the structure
  • Knauf fiberglass insulation provides superior thermal and sound control perfomance that improves comfort, privacy and productivity
  • Kraft vapor retarder helps prevent water vapor from condensing to liquid water within the cavity and has a vapor transmission (permeance) rating of 1.0 or less, kraft facing will burn and should not be left exposed
  • Reduces heating and cooling bill by preventing outside air from entering and keeping controlled air inside
  • Fiberglass insulation minimizes insect intrusions by covering areas of entry
  • All Knauf fiberglass insulation is GREENGUARD Gold Certified, free of red list chemicals and formaldehyde
  • Learn All About Insulation R-Values here.
  • Learn more about the various Types of Insulation here.
  • Click here to learn more about Eco Options and Energy Efficiency
  • Return Policy



Cover Area Per Bag (sq. ft.)64 sq ftCoverage Area (sq. ft.)64 sq ft
Product Length (ft.)4 ftProduct Thickness (in.)12 in
Product Width (in.)24 in


Bag Size4.16666667 ft. x 25 in. x 16 in.Batt/Roll Size4 ft. x 12 in. x 24 in.
Compatible Install SurfaceConcrete, Existing Drywall, Metal, Plywood, WoodFaced or UnfacedFaced
Insulation FeaturesFormaldehyde Free, Soundproofing Insulation, Vapor RetardantInsulation LocationAttic, Ceiling Insulation, Interior Ceiling, Knee Wall
Insulation R-ValueR38Insulation TypeBatt
Number of Pieces8Pack Size1
Product Weight (lb.)33 lbReturnable90-Day
Roll or BattBatt

Warranty / Certifications

Warranty Information1 Year Limited Warranty

Questions & Answers

Q:Can I use this for insulating underneath the floor (in a crawl space) or is it attic only?
by|Dec 15, 2021
1 Answer
Answer This Question

A:  You may use in a crawl space. Always put the kraft paper to warm side of the house so it will face up to the floor. You may use "tiger teeth" or straps to hold in place.

by|Feb 24, 2022
    Q:how many bags does it come with
    by|Aug 29, 2021
    1 Answer
    Answer This Question

    A:  It will come with 8 bags total. We apologize for the confusion and will get that corrected.

    by|Aug 30, 2021
      Q:It says the roll is 4 ft long but the coverage area is 64 soft, how long of a distance will one b...
      by|Feb 13, 2021
      1 Answer
      Answer This Question

      A:  This product is individual batt pieces that are 2 feet wide by 4 feet long or 8 sq feet per batt piece. There are 8 pieces in a bag or 64 total square feet in a bag.

      by|Oct 28, 2023
        Q:How much does it weigh per bundle or a pack of 4 ?
        by|Jul 20, 2020
        1 Answer
        Answer This Question

        A:  127 pounds is the weight for a package of 4.

        by|Nov 20, 2023
          1 found this answer helpful
          Showing 1-4 of 8

          Customer Reviews

          4.7 out of 5
          • 4.7
            out of 72 reviews
          • 98% recommend this product
          Filter by:
          Showing 1-10 of 72 reviews
          Great product...
          Great product
          Response from Tamy WoodwardApr 26, 2021
          We appreciate your review and thank you for purchasing Knauf Insulation. KnaufInsulation
          • Verified Purchase
          2 found this review helpful
          So easy to install!
          We are first time home owners, and one of our first big DIY projects was insulating the attic. The Knauf Insulation comes in 16”x48” batts, which made installation a breeze. We were able to insulate the whole attic in one afternoon. Our friends and family were so impressed!! We owe it all to this quality product! Highly recommend.
          Response from Customer ServiceFeb 22, 2021
          Congratulations on your first home! That is a great first project that can lower your energy costs and improve the comfort of the home. We are glad to hear that Knauf EcoBatt Insulation worked well in your attic and thank you so much for sharing. Excellent photo!
            • Recommended
            We order by the truckload
            I’m an insulation contractor with a few crews and we install anywhere from 25-40 truckloads of Knauf insulation per year. For years it has been our preferred brand for a few reasons. It is a very consistent material throughout which makes it cut more cleanly and install more smoothly. Other brands we have tried have actually had chunks of unprocessed glass in them. Others fall apart as you try to handle the pieces. It is a smoother fiber which makes it less unpleasant to handle. Other brands feel rougher. We also love that it is greenguard certified as well as the high recycled content. Overall this all translates into a better installation experience, which enhances the job outcome and makes a Grade 1 install more consistently achievable, and that’s what is best for our customers’ comfort and energy performance. We are proud to install this material.
            Response from Customer ServiceJan 15, 2021
            Thank you very much for your kind words and sharing this great photo of the installed insulation. It looks excellent! We are thrilled to hear that Knauf Insulation is your preferred brand for so many reasons. The best experience for our customers is our main goal. We look forward to providing you with top quality fiberglass insulation for years to come.
              • Recommended
                Excellent Product
                My customers love this product. It's low itch, low odor formula makes it much more pleasant than others to work with.
                Response from Customer ExperienceJul 14, 2023
                Hello, Thank you for taking the time to send us your review. We appreciate your business and are happy to hear you have had a good experience working with our insulation!
                  • Recommended
                  The packaging is superior compared to its competitors.
                  Response from Customer ExperienceJul 13, 2023
                  Hi Stacy, Thank you for sharing your feedback! We are happy to hear that you had a positive experience working with our insulation.
                    • Recommended
                    GREAT PRODUCT
                    I used this in my very first install and it was great to work with
                    Response from Customer ExperienceJul 13, 2023
                    Hi Samantha, We are happy to hear your first experience was a great one! We appreciate your feedback.
                      • Recommended
                      Awesome product
                      I am a long time Knauf Insulation customer and they are by far, without question, the very best at what they do!!
                      Response from Customer ExperienceJul 13, 2023
                      Hi, We are happy to hear you have had a great experience using our product. We appreciate your feedback and loyalty!
                        • Recommended
                        less dust better for installers than competition
                        we have tried every product out there and came back to this
                        Response from Customer ExperienceJul 13, 2023
                        Hi, We are happy you have had a great experience working with our product. We appreciate your feedback!
                          • Recommended
                          A pleasure to install compared w other brands
                          My company has used all the other big brands in the past. We now only install KN products. They are great to work with and much less irritating to the skin than other brands. Great product and terrific customer service
                          Response from Customer Experience Jul 13, 2023
                          Hi Chris, Thank you for your feedback. We strive to be the best and are happy to hear the quality and our customer service team is meeting your expectations.
                            • Recommended
                            Showing 1-10 of 72 reviews