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Model # B781

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Attic Pro Fiberglass Blown-in Insulation

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  • Quick and easy to install, typical jobs take 4-6 hours
  • Free 24 hour machine rental with the purchase of 10 bags
  • Installs in hard-to-reach spaces, filling in gaps and crevices
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Product Details

About This Product

Attic Protector is formaldehyde-free fiber glass blown-in insulation that is ideal for attics. The coverage of each bag is determined by the thickness (R-value) blown. Can be applied to any R-value with available fiber glass blown in machine.

Highlights

  • 1-bag covers 155 sq. ft. for R-13/103 sq. ft. for R-19/62 sq. ft. for R-30/35 sq. ft. for R-49/28 sq. ft. for R-60
  • Install using an insulation blowing machine
  • Can be installed on top of existing insulation
  • SCS recycled content certification
  • GREENGUARD gold certified for office indoor air quality and SCS certified for home indoor air quality
  • Click here to learn more about Eco Options and Energy Efficiency
  • enviornmental
  • How much do you need. Let our calculator help: Insulation calculator button
  • Return Policy

Product Information

Internet # 100317855

Model # B781

Store SKU # 1001404772

Specifications

Dimensions

Coverage Area (sq. ft.)

103.2 sq ft

Maximum Coverage Area (sq. ft.)

103

Minimum Coverage Area (sq. ft.)

35 sq ft

Product Thickness (in.)

6.5 in

Details

Bag Weight (lb.)

25 lb

Compatible Install Surface

Cement, Concrete, Copper Pipes, Existing Drywall, Existing Insulation, Fiberglass, Metal, PVC/CPVC Pipes, Pex Pipes, Plywood, Tile Flooring, Wood

Insulation Features

Formaldehyde Free, Soundproofing Insulation

Insulation Location

Attic, Ceiling Insulation

Insulation R-Value per Inch

R19

Insulation R-Value Range

R19-R49

Insulation Type

Loose Fill

Material

Fiberglass

Pack Size

1

Questions & Answers

I have 2200 sq ft home want to add 7 inches on top of existing blown in how many bags
ByAug 17, 2026
1 Answer | 
Answer This Question

Based on the data page (https://www.jm.com/content/dam/jm/global/en/insulation-systems/products/assets/technical-guide/bid-356-attic-protector-attic-card-b-785.pdf), JM shows the installed R-values. R-19 would be the closest to the 7inches you want at ~8inches. Coverage per bag is 109.3sqft. Total bags for 2,200sqft is 21 bags.

By|Aug 18, 2026


    1050 sq feet home how many bags for r30
    ByJul 10, 2026
    1 Answer | 
    Answer This Question

    You will need just under 16 bags based on this coverage chart: https://www.jm.com/content/dam/jm/global/en/insulation-systems/products/assets/technical-guide/bid-356-attic-protector-attic-card-b-785.pdf 1050/66.5=15.79

    By|Jul 13, 2026


      I have a 1800 sq ft home and want R38. How many bags do I need?
      ByJun 12, 2026
      1 Answer | 
      Answer This Question

      Please refer to the attic card: https://www.jm.com/content/dam/jm/global/en/insulation-systems/products/assets/technical-guide/bid-356-attic-protector-attic-card-b-785.pdf Each bag for an R-28 covers 51sqft. For 1800sq ft you need 35 bags... 1800/51 = 35.2

      By|Jun 13, 2026


        1050 sq feet home how many bags for r38
        ByApr 20, 2026
        1 Answer | 
        Answer This Question

        Per our coverage chart, to reach an R-38 you need 15.3" thickness. Each bag covers 51sqft for R-38, so to cover 1,050 sqft you are looking at 20.5 bags. https://www.jm.com/content/dam/jm/global/en/insulation-systems/products/assets/technical-guide/bid-356-attic-protector-attic-card-b-785.pdf

        By|Apr 21, 2026


          Can this machine be use with pink owens corning loose fiber glass as well?
          ByMar 7, 2026
          1 Answer | 
          Answer This Question

          Johns Manville recommends calling Owens Corning to determine this. There might be differences in the insulation as compared to the Attic Protector that JM is unaware of as that is not our product.

          By|Mar 10, 2026


            Our home is 3500 sq ft and we live in Zone 1 and are trying to get to R38 - how many bags do we need?
            ByApr 19, 2025
            1 Answer | 
            Answer This Question

            https://www.jm.com/content/dam/jm/global/en/building-insulation/Files/BI%20Toolbox/BID-356-Attic-Protector-Attic-Card-B-785.pdf You will need about 68 bags.

            By|Apr 29, 2025


              Can you blow this insulation into interior walls between studs?
              ByMar 18, 2025
              1 Answer | 
              Answer This Question

              Yes, you can use Attic Protector in the walls. JM does not have a "wall chart" so you can use the Climate Pro Wall Coverage Chart and be reasonably close in achieving the same R-value. The main difference would be adjusting for bag count b/c Attic Protector is a lighter weight bag than Climate Pro.

              By|Mar 24, 2025


                Why dont you rent the machine to blow in the insulation?
                ByJan 28, 2025
                1 Answer | 
                Answer This Question

                Machines can be rented through your local hardware store.

                By|Feb 25, 2025


                  Viewing 1-8 of 66

                  Customer Reviews

                  4.7 out of 5

                  • 4.7 out of 139 reviews
                  • 97% recommend this product
                  Filter by:
                  Showing 1-10 of 139 reviews
                  Johns Manville Attic Protector Fiberglass
                  Johns Manville Attic Protector Fiberglass Blown-in Insula : I prefer over Attic cat..
                  by
                  • Verified Purchase
                  • Recommended
                  Started with cellulose and returned due to machine issues (two...
                  Started with cellulose and returned due to machine issues (two machines) and the large amount of dust!! Started over with the and very satisfied. Machine worked like a charm and it was super easy to install! Time will tell how much we save each month.
                  by
                  • Verified Purchase
                  easy installation
                  easy installation
                  by
                  • Verified Purchase
                  • Recommended
                  2 found this review helpful
                  The Johns Manville loose-fill fiberglass insulation was very easy to use especially with their do...
                  The Johns Manville loose-fill fiberglass insulation was very easy to use especially with their do-it-yourself machine and equipment. However I used it to dense pack exterior walls in my home, and the Machine still work perfectly with no clogs or any difficulties.
                  by
                  • Verified Purchase
                  • Recommended
                  2 found this review helpful
                  Fairly easy to use and works well
                  I used a bag of this insulation and also some bags of pink insulation. I like the white color because it looks like snow and coincidentally it was snowing outside at the time. It did make it a little tricky to see what was snow and what was insulation in the garage though. I think it is easier to see the white insulation in the dark attic. If you are looking at different makes of insulation it is hard to compare “apples to apples” because they quote a lot of different numbers. You get a certain ‘R’ value for a certain depth of insulation so you can compare that. You can also look at what one bag will provide for you, e.g. “R19 for 103-sq ft”. When I compared this product with the pink product it seemed to be more expensive and the listed coverage was slightly less. I don’t know whether I’m missing something. I saw it listed as almost 20% more expensive and it covered 103 sq ft at R19 versus the pink stuff which covered 109.5 sq ft. I would suggest if you have a lot to do that you shop around and also take into account the cost of the machine. One thing to take into consideration is that you can get the machine free if you buy enough bags but it may not be worth it. I was adding insulation to some that I already had to increase the depth. I didn’t know how many bags I would use. If I bought 10 bags then I could rent the machine for free for 24 hours. If you don’t really need 10 it is probably not worth using 10 just to get a free machine rental. I took the machine and 10 bags but I was done in less than 4 hours, so the rental was less, and I took 4 bags back. As long as you have everything ready at home when you come home with the machine you should be able to do a complete attic in less than 4 hours. Have the ladders set up, have your mask, knee pads, overall ready to go and go up in the attic before you get the machine and make sure you have a worked out strategy. You definitely need someone else to fill the machine for you. If you had to go in and out of the attic to load the machine it could easily take more than 4 hours. I was able to blast through 7 bags and then shower and still get back to the store in plenty of time. I had the same problem that I have seen in other reviews: the remote on the end of the pipe didn’t work so I couldn’t turn the machine on and off in the attic. We had to do half a bag at a time and then I would move my position and shout to have the machine turned on again. It worked but would have been much better if the remote worked. Also the two pipes didn’t lock together so we had to use duct tape to secure them. Get the store to test the remote in the store before you rent it. Also get them to show you how to use it.
                  by
                  • Recommended
                  15 found this review helpful
                  Definitely a D.I.Y Project
                  I have an area in the attic over a covered outside porch that leaks cold air into the attic 24/7.... I just wanted to close it off from the rest of the attic where it joined to help keep heat in the house. I figured I could get the blow-in insulation and throw it by hand since it was a small area.. That wasn't working out too well so I got out my 18 volt leaf blower and some 4 inch PVC and made my own installation machine... (see pics below) If I had to do the whole attic I would have definitely rented a machine, But since it was a small area I decided to do it this way. It worked incredibly well with my blower (LFIM) (loose fill insulation machine(tm)) All you need to do is open the insulation package and break it up,(please wear a respirator) then as your running the blower feed it into the drop tube and it shoots exactly where you want it and nice and fluffy so the insulation will be effective being able to stop air and trap it in the small pockets created by loose filling... By the time I was done my drafts were completely gone and it was a neat job.
                  by
                  • Recommended
                  15 found this review helpful
                  It does the job!
                  I live in a place where people don't seem to believe in insulation. Our house had none. I put in a little over 2 feet. On a day where the outside temperature was about 37F degrees. Our heat pump used to run about 20 or more hours. After putting the insulation, our heat pump only ran about 12 hours! I can't believe the difference. Plus our cost of heat will be MUCH lower now. The house is very comfortable now.
                  by
                  • Recommended
                  3 found this review helpful
                  Saved a third of the cost quoted by doing it DIY!
                  We renter our blow in machine from Home Depot to install on top of our existing insulation. Attic Protector is formaldehyde-free, fiberglass, blown-in insulation that is ideal for attics. GREENGUARD Gold certified and SCS certified for home indoor air quality. We used ten bags in each of our bi-level two attic areas to obtain a R-49 value. An easy DIY job for us weekend warriors to accomplish and a great money saver, both in heating cost and contractor fees. The coverage of each bag is determined by the thickness (R-value) blown. You can apply to any R-value with the available fiberglass blown-in machine. One bag covers 155 sq. ft. for R-13/103 sq. ft. for R-19/62 sq. ft. for R-30/35 sq. ft. for R-49/28 sq. ft. for R-60
                  by
                  • Recommended
                  1 found this review helpful
                  This customer chose to rate the product and not provide text.
                  by
                  • Verified Purchase
                  Chaos occured when the insulation order and the blower reservation got uncoupled. Took almost an hour to rent the blower, and almost that long when I returned it to get my deposit refunded.
                  by
                  • Verified Purchase
                  Showing 1-10 of 139 reviews