At a Glance

For Use in Ceilings

For Use in Crawlspaces

For Use in Basements

Ask Mylow

Mylow is an AI virtual assistant.

More Information

Does this insulation reduce sound?Can I install it over existing insulation?What tools are needed for installation?What is the warranty period?Will this help lower energy costs?

US Greenfiber SANCTUARY by Greenfiber R- 60 Cellulose Blown-In Insulation with Sound Barrier 48.7-sq ft per bag ( 25-lb )

Name: US Greenfiber SANCTUARY by Greenfiber R- 60 Cellulose Blown-In Insulation with Sound Barrier 48.7-sq ft per bag ( 25-lb )
Brand: US Greenfiber
SKU: 5001939515
Rating: 4.2 (383 reviews)

Shop US Greenfiber

4.2

383

Get Pricing & Availability

Members save more.

Here are some similar items...

Phyfalip Ceramic Fiber Insulation Blanket Sheet 24 x 12 x 1 Inch Fireproof High Temperature 2400F for Ovens Kilns Forges

Phyfalip 2 pcs 24 x 12 x 1 Inch Ceramic Fiber Blanket Insulation Fireproof Rated 2400F for Stoves Kilns Forges

Phyfalip Ceramic Fiber Insulation Blanket 24 x 15 7 x 1 Inch 2600F Fireproof Sheet for Wood Stove Fireplace Pellet Stove Chimney Furnace Boiler

Arctic Fiber InsulationR- 19 Cellulose Blown-In Insulation with Sound Barrier 46-sq ft per bag ( 25-lb )

Owens CorningAttiCat R- 60 Fiberglass Blown-In Insulation with Sound Barrier 110.7-sq ft per bag ( 27.5-lb )

250

GreenFiberR- 19 Cellulose Blown-In Insulation with Sound Barrier 48.5-sq ft per bag ( 30-lb )

Phyfalip Ceramic Fiber Blanket 60 x 24 x 1 Inch High Temperature Fireproof Insulation for Oven Stove Kiln Forge Roll

Phyfalip Ceramic Fiber Insulation Blanket 60 x 24 x 1 Inch Fireproof Sheet Withstands 2600F for Wood Stove Baffle Fireplace Pellet Stove Chimney

Phyfalip Ceramic Fiber Blanket Fireproof Insulation 60 x 24 x 1 Inch High Temperature Rated 2400F for Oven Stove Kiln Forge

Johns ManvilleAttic Protector R- 19 Fiberglass Blown-In Insulation with Sound Barrier 109-sq ft per bag ( 25.2-lb )

163

Best Price. Guaranteed

Find a lower price on an exact item? We'll match it. Some exclusions apply.

Price Guarantee

FREE Returns

Return it in store or ship it back for free. Eligibility rules apply.

Return Policy

FREE Shipping

Delivery is on us for orders over $45. Some exclusions apply.

Shipping Details

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.

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
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.
Can be installed over existing insulation
Made with 85% post-consumer paper and uses low-energy manufacturing and short-haul transportation, resulting in insulation with lower embodied carbon
Advanced fire resistance provides more time to escape and meets class 1 fire rating
No-itch formula doesn't require cutting tools; allowing for easy installation in just 3 steps: 1) assemble machine 2) place machine on flat, dry surface 3) point and blow in

General
Insulation Type	Cellulose	Series Name	SANCTUARY by Greenfiber

Dimensions
R-Value per Inch	3.7	Coverage Area (Sq. Feet)	48.7
Maximum R-Value	60	Package Weight (lbs.)	25
Bag Dimensions (L x W x D)	12-in x 16-in x 25-in

Features
Formaldehyde Free	Yes	Sound Barrier	Yes
Vapor Retardant	No

Certifications
CA Residents: Prop 65 Warning(s)	No	ENERGY STAR Certified	Yes

Warranty
Warranty	Limited lifetime

Compatibility
For Use in Attics	Yes	For Use in Garage Doors	No
For Use in Basements	Yes	For Use in Masonry	No
For Use in Ceilings	Yes	For Use in Plumbing	No
For Use in Crawlspaces	Yes	For Use in Vents	No
For Use in Doors	No	For Use in Walls	Yes
For Use in Duct	No	For Use in Windows	No
For Use in Electrical	No	Fits 2 x 4 Walls	Yes
For Use in Floors	Yes	Fits 2 x 6 Walls	Yes

Miscellaneous
UNSPSC	30141500

Check out the Best Selling Blown-In Insulation on Lowes.com

Review

4.2 out of 5

383 Reviews

84% Recommend this product

Ratings may include incentivized customer reviews.

Read All Reviews

+ 9

What Customers Are Saying

Customers overwhelmingly praise the cellulose insulation for being non-itchy, affordable—roughly one-third the price of fiberglass—and highly effective at improving home warmth and reducing energy bills. Reviewers highlight its ability to fill gaps and conform to irregular spaces, making it ideal for retrofitting. Installation with a functioning blower is described as straightforward and efficient. However, the process generates excessive dust requiring a respirator and eye protection, and many report frustrations with poorly maintained or unavailable rental machines. Despite these drawbacks, most customers consider the product itself an excellent value.

Customer review summary generated by AI, including incentivized reviews.

383 Customer Reviews

Sort By

It worked as intended. First time installing it and it went well. You need to use a respirator and a tyvek suit

DavideSeptember 10, 2026
Verified Purchaser

Was this Review Helpful ?

Great Results!

Would Recommend

I bought this product for my garage ceiling. Bought it for thermal insulating quality and for sound insulating quality. And in both it came through with flying colors. And the price was very reasonable. Easy installation with the loaner machine. And i appreciate the fire retardant feature. However the pricing was a bit deceptive when in the description it says one bale covers 47 square ft at R-60. Its more like 47 square feet at R-13. You have to dig into the details to accurately figure ...

WilleSeptember 9, 2026
Verified Purchaser

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/adbc3e18-8912-581c-8904-e2cb49820821

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/c7d75e90-7c47-5f59-83e6-62eea0574095

Was this Review Helpful ?

Good stuff

Would Recommend

Should work pretty well with my other blow in insulation

MikeSeptember 9, 2026
Verified Purchaser

Was this Review Helpful ?

Insulation

Would Recommend

It’s insulation

MarkSeptember 3, 2026
Verified Purchaser

Was this Review Helpful ?

Exactly as described

Purchase to insulate our garage, wonderful product easy to use. Has helped tremendously with thermal coverage.

Momaa3August 30, 2026
Verified Purchaser

Was this Review Helpful ?

Blow in insullation.

Would Recommend

When i purchased this you got to use the blowing hopper with the purchase of 20 bags of installation. 20 bags covers alot. But if your thinking of doing this yourself i would advise get a second person to feed the hopper. If not your going to be doing alot of up and down a ladder. The insulation clogs up in the hopper and has to be constantly shoved down. Wear a mask. Horrible job but i got it done. I will never do this again in a small attic space where you have to crawl on your knees and bell...

WillAugust 21, 2026
Verified Purchaser

Was this Review Helpful ?

Very dusty, and took a LONG time!

The material itself was fine. The installation was another story. I have a very low crawl space in my attic, so I knew I already had that obstacle in my way. One thing I did not anticipate, even though I have read the other reviews, was how much dust this actually puts out! As soon as you start spraying, you can no longer see what you are doing. The mask helped, but it was still horrible. The other big issue was how long this takes. I don't know if it is the material, or if I had a bad blower f...

JimJimAugust 15, 2026
Verified Purchaser

Was this Review Helpful ?

Would Not Recommend

We rented the blower to install the insulation and it was terrible. Broke clogged first bag.

BlakeJuly 18, 2026
Verified Purchaser

Was this Review Helpful ?

Response from Greenfiber

Thank you for making us aware of this situation. Please bring the issues to the attention of your local store, and they have a protocol to follow in ...

GreenfiberAugust 3, 2026

Easy, affordable option for any DIY

After getting several quotes for thousands of dollars I priced this product and decided to give a go. Great help from m the Pro desk and Fast/friendly delivery of material. Gotta pickup blower yourself but rental is free with large enough purchase. Great value with a little bit of DIY effort. Pro tip…working area around blower machine gets super dusty!

DmacJuly 18, 2026
Verified Purchaser

Was this Review Helpful ?

Response from Greenfiber

Thank you for your review of SANCTUARY. We’re pleased that we were able to meet your insulation needs!

GreenfiberAugust 3, 2026

80 Questions

Read All Q&A

Sort By

US Greenfiber: Featured Videos

COMPARE PRODUCTS

		Name	Current Item US GreenfiberSANCTUARY by Greenfiber R- 60 Cellulose Blown-In Insulation with Sound Barrier 48.7-sq ft per bag ( 25-lb )
		Ratings	382
		Maximum R-Value	60
		R-Value per Inch	3.7
		Fits 2 x 4 Walls
Owens CorningAttiCat R- 60 Fiberglass Blown-In Insulation with Sound Barrier 110.7-sq ft per bag ( 27.5-lb )	Johns ManvilleAttic Protector R- 19 Fiberglass Blown-In Insulation with Sound Barrier 109-sq ft per bag ( 25.2-lb )	Arctic Fiber InsulationR- 19 Cellulose Blown-In Insulation with Sound Barrier 46-sq ft per bag ( 25-lb )	Phyfalip Ceramic Fiber Insulation Blanket 24 x 15 7 x 1 Inch 2600F Fireproof Sheet for Wood Stove Fireplace Pellet Stove Chimney Furnace Boiler	Phyfalip Ceramic Fiber Insulation Blanket Sheet 24 x 12 x 1 Inch Fireproof High Temperature 2400F for Ovens Kilns Forges
250	163	16
60	19	19
3	2.67	3.75