Greenfiber 25-Pound Cellulose Blown-In Insulation

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25-Pound Cellulose Blown-In Insulation


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* Estimated stock levels as of Sun, Nov 27, 2022. All items subject to prior sale. Prices may vary between stores and online. Please call ahead to confirm availability of items marked as Limited Stock.

  • 60%¹ Reduction in Sound Power
  • 25%² Savings on Heating & Cooling
  • 1/A Advanced Fire Resistance
  • 85% recycled material
  • Formaldehyde free
  • Fits any wall configuration
  • For use in attics, ceilings, crawlspaces, and floors


Used as attic insulation and installed in walls, floors and ceilings, Sanctuary will significantly improve the comfort, safety and well-being provided by any home. The first all-in-one fiber insulation that can be blown-in or spray-applied, its suitable for all climates and conditions. Capable of reducing sound power by 60% and heating and cooling costs by 25%, its easily installed, environmentally responsible, and packaged to optimize coverage and ease of installation.

Sanctuary is engineered to fill tiny crevices and gaps, creating a dense, scientifically advanced barrier capable of reducing the power of sound by up to 60%. As cellulose insulation that can be blown-in or spray-applied, Sanctuary can be easily installed over existing insulation, and unlike batt or roll alternatives, it is engineered to fill every gap, void and hard-to-reach place without time-consuming cutting and fitting. Installed in attics, walls, ceilings and floors, Sanctuary keeps homes cooler in the summer and warmer in the winter.Sanctuary has a Class 1/A fire rating, qualifies as a fire-blocking material and has been proven to be 57% better at resisting fire than most other common type of residential insulation3.

1 in field testing on identical 2x4 exterior wall types Greenfiber R-13 Stabilized Spray-In Insulation outperforms R-15 unfaced fiberglass batts by 4 NIC rating points, which equates to a 60% reduction in sound power. See our installation instructions for full details on how to meet specifications and maximize sound reduction. 2 Savings vary. Find out why in the sellers fact sheet on R-values. Higher R-values mean greater insulating power. Energy analysis of climate zones 1-7 using 2018 IECC reference home comparing R11 attic to DOE recommended attic insulation by climate. 3 As demonstrated by The Large-Scale Outdoor Fire Test Program comparing: (1) an uninsulated structure; (2) a structure insulated with R-13 fiberglass batts (wall cavities) and blown-in, loose fill insulation (attic floor); and (3) a structure insulated with Greenfibers cellulose insulation using spray applied cellulose insulation (wall cavities) and blown-in, loose-fill cellulose insulation (attic floor)



Color Gray/Brown
Coverage 48.8 sq. ft. per bag at R19
Material Cellulose
R-Value R19 to R60
R-Value per Inch 3.7
Relative Density 9 LB/FT3 compressed
Type Cellulose
Vapor Pressure Negligible @ 20o C
pH <8.2 (2% suspension @ 25o C)


Length 2.08 ft
Square Feet 48.8 sq ft per bag at R19
Thickness 3.3 in
Weight 25 lb
Width 16 in

Manufacturing Details
The following information is subject to change without notice

Certification, Codes, Standards Energy Star certified; Class 1/A fire rating
Country of Origin US
Manufacturer Warranty Limited lifetime warranty
Shop USA Yes

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