Sanctuary by Greenfiber Blow-In or Spray-Applied Insulation

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, it’s suitable for all climates and conditions. Capable of reducing sound power by 60%¹ and heating and cooling costs by 25%², it’s easily installed, environmentally responsible, and packaged to optimize coverage and ease of installation.
  • Bag Size: 25 lbs.
  • R-Value: R19 to R60
  • Coverage: 48.8 sq. ft. per bag at R19 (loose-fill and spray-applied attic applications)
Image of Sanctuary by Greenfiber Blow-In or Spray-Applied Insulation


in Sound


on Heating
& Cooling



Product Features

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%¹. 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, reducing heating and cooling costs by up to 25%2. 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.

  • 60% reduction in sound power¹
  • 25% reduction in heating and cooling costs²
  • 85% recycled material
  • Coverage Area (Sq. Ft.): 48.8 at R-19
  • Package Weight (lbs.): 25
  • Energy Star certified
  • Formaldehyde free
  • Limited lifetime warranty
  • R-Value per Inch: 3.7
  • Insulation Type: Cellulose
  • Fits any wall configuration
  • For use in attics
  • For use in ceilings
  • For use in crawlspaces
  • For use in floors

Technical Documents

  • Mold & Moisture 65.74 KB | PDF Download
  • DIY Attic Installation Guide 707.77 KB | PDF Download
  • Homeowner FAQ 389.6 KB | PDF Download
  • DIY Sidewall Installation Guide 54.71 KB | PDF Download
  • Retrofit Your Home with Greenfiber Insulation 519.95 KB | PDF Download
  • Greenfiber Insulation Guide - Planning & Instructions 377.96 KB | PDF Download