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25 lbs. Cellulose Blown-In Insulation or Spray Applied Insulation

Buy 30 or more $10.39
  • Reduces sound by 60% and heating and cooling costs by up to 20%
  • Locks in carbon for the life of your home
  • Free 24-hour machine rental with purchase of 20 bags
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Product Overview

SANCTUARY by Greenfiber can be installed in attics, walls, floors and ceilings to significantly improve the comfort, safety and well-being provided by any home. This is the first All-In-One cellulose insulation that can be blown-in or spray-applied, and it's suitable for all climates and conditions. Capable of reducing sound power by 60% and heating and cooling costs by up to 20%, it's made from recycled plant fibers which keep carbon locked in for the life of your home.
  • First all-in-one cellulose insulation is ideal for attics, sidewalls and ceilings, and can be blown-in, dense-packed or spray-applied
  • Covers 48.8 sq. ft. per 25 lbs. bag at R-19 to reduce job site time
  • Fits any wall type: 2 x 4, 2 x 6 or 2 x 8
  • New formulation is suitable for all climates
  • Can be installed over existing insulation
  • No-itch formula doesn't require cutting tools, allowing for installation in just 3 steps: 1) assemble machine 2) place machine on flat, dry surface 3) point and blow in
  • Reduces outside noise when applied in walls
  • Made with 85% post-consumer paper and uses low-energy manufacturing and short-haul transportation, resulting in insulation with lower embodied carbon
  • Locks in carbon for the life of your home to reduce global warming
  • Advanced fire resistance provides more time to escape and meets class 1 fire rating
  • Limited lifetime warranty



Cover Area Per Bag (sq. ft.)48.8 ft²Coverage Area (sq. ft.)48.8 ft²
Maximum coverage area (sq. ft.)86.7Minimum Coverage Area (sq. ft.)10.8 ft²
Product Length (ft.)2.08 ftProduct Thickness (in.)3.3 in
Product Width (in.)16 in


Bag Weight (lb.)25Compatible Install SurfaceExisting Insulation,Fiberglass,Plywood,Wood
Insulation FeaturesFire Block Rated,Fire Resistant,Formaldehyde Free,Insect & Rodent Treated,Soundproofing InsulationInsulation Location2x4 Wall,2x6 Wall,2x8 Wall,Basement,Between Walls,Ceiling Insulation,Floor,Garage,Interior Ceiling,Interior Wall,Joists,Roof
Insulation R-Value per InchR3.7Insulation R-Value RangeR11-R60
Insulation TypeLoose FillMaterialCellulose

Warranty / Certifications

Warranty InformationLimited Lifetime Warranty

Questions & Answers

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Customer Reviews

  • 4
    out of 109 reviews
  • 64%recommend this product
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Showing 1-10 of 109 reviews
Immediate difference
Mostly I was concerned with how the blower would perform and it exceeded expectations. Sprayed 18 bags in under 2 hours. Also the air didn't turn on till 4 in the afternoon the first day and maintained 69 degrees with ease. It's early, but very pleased thus far!
Response from GreenfiberMay 2, 2022
Hi Chris, thanks for sharing about your positive experience with SANCTUARY. Enjoy those consistent temperatures!
    • Recommended
    4 found this review helpful
    Cellulose Insulation
    Blow in material for additional attic insulation. Pricy solution if you need 30 pacs!
    • Verified Purchase
    1 found this review helpful
    Easy to install, really dusty
    We blew-in 99 bags with our 24-hour rental--putting 1 bag into the hopper every 4-5 min with 3 people. Only fill to the grate because it needs the air to fluff up. Remove plastic as you fill, but stop every 25 bags to get plastic off the mixer paddles.
      • Recommended
      9 found this review helpful
      Prep in advance and install in little time
      The installation went very smoothly. I took us less than 3 hours to blow-in 30 bags. I repositioned within the attic between each bag was being fed while my ground support was opening the next bag. Start from the furthest corner from where the hose enters the attic and work towards where the hose enters the attic. I believe we were well prepared ahead of time (before the actual installation started): .. sealed the scuttle-hole with a 6mil plastic wall around it .. snaked the 50 foot hose through a soffit to make sure we could reach everywhere. NOTE: THE HD WEBSITE SAYS TWO 50' HOSES, BUT THE NORTH KINGSTOWN STORE ONLY HAS ONE. .. Protected the machine from rain and weather .. Wore ski-mask like safety goggles and a respirator mask: enabled me to breathe easily and see well. Also wore an LED headlamp. .. communicated to my guy on the ground who was feeding the machine with wireless headphones over our cell phones (START/STOP) The machine is not light. Two strong guys can get it into the back of a pick-up truck. Wish we were a little stronger, but got it up there!
      • Verified Purchase
      • Recommended
      7 found this review helpful
      Mine arrived smelling like diesel fuel, and still smell almost a month later.
      While this is likely a good product, mine arrived smelling strongly of diesel fuel. At some point in their production, storage, or transportation I think they must have been exposed to a fine mist that was deeply absorbed into the fibers. I had hoped the smell would eventually dissipate, but it is now nearly a month later and they still stink despite having been kept in a well ventilated area. I am definitely not going to blow this stuff into my walls and then have my place smell like a gas station forever more, so I am stuck with this huge pile of (so far) useless bails.
      Response from GreenfiberNov 12, 2021
      Hi Josh, thank you for alerting us of this, and we apologize for the hassle. This situation has never occurred before – each batch of SANCTUARY is tested before leaving our facility. We’d like to track your order so we can communicate with our transportation partners. Could you please provide more information regarding where you purchased the product and when so we can investigate the issue? You can call our support team at 1-800-228-0024.
      • Verified Purchase
      13 found this review helpful
      yes it works
      I have a new construction house the building inspector told us we needed measuring ruler’s every 300 feet. Did anyone ever hear of this before?
        • Recommended
        • Verified Purchase
        Worked really well and the house is warmer than with...
        Worked really well and the house is warmer than with loose cellulose and less space used. The complaints about smell are because their attic was not sealed from the interior of the house when they sprayed it in. A well sealed house prevents drafts and lost heat will have little or no smell from the Bo rite. Once it lays laid undisturbed, the smell will diminish over time.
        • Verified Purchase
        Bag material and other objects in insulation.
        This insulation has all kinds of plastic and rope like objects in it. I blew around 450 bags of this stuff. It blows great and seperates great. However it would clog our blower machine up due to the plastic and other objects that would wind up around the finger seperators in our machine. Looks like bag material that when a bag may burst at the factory when filling the bags that it is just scooped up and thrown back into their bag packer with the broken bag included. I do like the price and would buy again. However the factory that bags this stuff needs a better way of rebaging the broken bags.
        • Verified Purchase
        I am glad to have the insulation installed in my...
        I am glad to have the insulation installed in my attic. It seems to be having an effect on my home's comfort level. However, I have an issue with the process of this installation. It was difficult to transport the bails of insulation to my home because there were no rental trucks available at the time I needed one. There was no way to reserve the blower machine because it was already out. I had to reserve it at 3:00 A.M. on a Sunday morning to ensure one was available to me. i was charged for the rental of the machine even though I purchased 58 bails and the clerk entered the wrong reimbursement. I have been told this would be corrected and show up on my account in three working days. after seven days I still did not see the reimbursement and my statement, though past the closing date, was not fully accessible to me and I could not see the correction.
        • Verified Purchase
        Showing 1-10 of 109 reviews