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Fits 2 x 4 Walls

Fits 2 x 6 Walls

Stud Spacing: 16 (in)

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Reflectix R- 21 Attic Wall Unfaced Reflective Roll Insulation 133.3-sq ft ( 16-in W x 100-ft L ) Individual pack

Name: Reflectix R- 21 Attic Wall Unfaced Reflective Roll Insulation 133.3-sq ft ( 16-in W x 100-ft L ) Individual pack
Brand: Reflectix
SKU: 1002728480
Price: 56.98 USD
Availability: InStock
Rating: 4.4 (51 reviews)

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4.4

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Reflectix® insulation products are a group of technologically advanced materials. They are ideal for new construction or retrofit applications in commercial, industrial, metal and post/frame buildings, along with many other DIY applications. When you think of insulation, you should think of Reflectix®. Our products are recognized for their thermal performance, easy installation, versatility, price and environmental friendliness.

Staple tab 16-in wide contractor size roll of double reflective insulation is easy to handle and install
Please note: this product arrives in a package 20-in H x 20-in W x 48-in L, please insure your vehicle can accommodate
R-values range from R-3.0 to R-21 depending on application
Staple tab edge provides for ease of installation on framing that is 16-in on center
More than 40 plus applications for metal, post frame and residential structures
Class A/Class 1 fire rating
A fiber and itch free product, it does not require protective clothing or respirators to install
Inhibits condensation and resists the growth of fungi, mold and mildew
Made at an ISO 9001:2008 manufacturing location

General
Total Package Quantity	1	Package Type	Individual pack
Package Count	1	Insulation Type	Reflective

Dimensions
Coverage Area (Sq. Feet)	133.3	R-Value per Inch	3
Length (Feet)	100	Width (Inches)	16
Bag Dimensions (L x W x D)	16 in x 20 in x 20 in	Maximum R-Value	21
Thickness (Inches)	0.3125	Package Weight (lbs.)	8

Features
Reflective	Double	Vapor Retardant	Yes
Stud Spacing (Inches)	16	Faced/Unfaced	Unfaced
Sound Barrier	No	Formaldehyde Free	Yes

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

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

Miscellaneous
UNSPSC	30141500

Check out the Best Selling Roll Insulation on Lowes.com

Review

4.4 out of 5

51 Reviews

3 Star

89% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

Customers overwhelmingly praise this product for its ease of installation, lightweight design, and effective insulation performance. Most highlight how it cuts cleanly with scissors or utility knife, staples securely without mess, and can be handled by one person in tight spaces like attics and crawl spaces. Reviewers appreciate that it requires no special tools, protective gear, or masks—unlike fiberglass—and doesn't leave irritating fibers or attract pests. Many report noticeable improvements in temperature control and warmer floors. A few note minor discrepancies in advertised dimensions or express skepticism about R-value claims, but these concerns are far outweighed by overall satisfaction and strong recommendations to repurchase.

Customer review summary generated by AI, including incentivized reviews.

51 Customer Reviews

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Product not 100 feet long!

Would Not Recommend

I purchased this multi-pack order to save money. I cut the 100 foot rolls to 25 foot lengths for installation in my crawl space. But, these rolls and the rolls from my prior order were all short. Some were short by as much as 13 feet!! This is totally unacceptable!!

September 1, 2026
Verified Purchaser

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Not Dependable

Would Not Recommend

When someone orders something for a customer and gets a date from Lowe’s when it’s gonna be delivered, you should be able to depend on that date. I ordered from Lowe’s because they assured me that I would have my order on Monday. I waited all day long for it as the app said it was set to be delivered on Monday. It didn’t come. Now, on Tuesday, the app says it will be delivered on Friday. FRIDAY! Who’s running their logistics part of the business? The project was scheduled to be completed on Tues...

DontBuyFromLowesJuly 14, 2026

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cathedral ceiling/roof insulation system component

Would Recommend

nice not to use w/o trimming size down.

TLG3June 11, 2026
Verified Purchaser

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Easy to use and put up.

Would Recommend

Nice easy to use product.

1thivMarch 30, 2026
Verified Purchaser

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Less than 100'

Would Recommend

Plan on getting less than 97' on the advertised 100' roll. I needed 11' pieces to install in floor joists. After cutting 8 pieces at 11', the remaining piece should have been 12' long. It was less than 9', and unusable. This happened on 2 rolls. They need to recalibrate their machines!!

DonaldFebruary 19, 2026
Verified Pro

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Legally found fraudulent

Would Not Recommend

FTC v. Superior Products International II, Inc. FTC v. SPM Thermo-Shield, Inc. FTC v. Innovative Designs, Inc. ... and others. The R-values claimed by this kind of material are based on a complete assembly, of which the material itself provides a small fraction of the actual performance. Think about it: if this product actually delivered R-21 in under a half inch, it would be more efficient than fiberglass, rockwool, or any foam. More efficient that the insulation that protects spacecraft aga...

EnteeceeDecember 18, 2025

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COMPARE PRODUCTS

		Name	Current Item ReflectixR- 21 Attic Wall Unfaced Reflective Roll Insulation 133.3-sq ft ( 16-in W x 100-ft L ) Individual pack
		Ratings	51
		Width (Inches)	16
		Thickness (Inches)	0.3125
		Insulation Type	Reflective
ReflectixReflective Insulation R- 7.5 Attic Unfaced Reflective Roll Insulation 133.3-sq ft ( 16-in W x 100-ft L ) Multi-pack	ReflectixR- 21 Attic Wall Unfaced Reflective Roll Insulation 100-sq ft ( 48-in W x 25-ft L ) Individual pack	ReflectixR- 21 Attic Wall Unfaced Reflective Roll Insulation 400-sq ft ( 48-in W x 100-ft L ) Individual pack	ReflectixR- 21 Attic Wall Unfaced Reflective Roll Insulation 200-sq ft ( 24-in W x 100-ft L ) Individual pack	ReflectixR- 21 Attic Wall Unfaced Reflective Roll Insulation 200-sq ft ( 24-in W x 100-ft L ) Multi-pack	ReflectixR- Attic Unfaced Reflective Roll Insulation 500-sq ft ( 48-in W x 125-ft L ) Individual pack	VEVORDouble Reflective Insulation Roll Perforated Woven Fabric Radiant Barrier 0.15mm 48 in x 125 ft Double-Sided Aluminum Foil Heat Reflective Shield Thermal Insulation Roll for Window RV Roof	ReflectixReflective Insulation R- 7.5 Attic Unfaced Reflective Roll Insulation 200-sq ft ( 24-in W x 100-ft L ) Multi-pack	VEVORDouble Reflective Insulation Roll Foam Core Radiant Barrier 3.2 mm 48 in x 50 ft Double-Sided Aluminum Foil EPE Foam Heat Reflective Shield Thermal Insulation Roll for Window RV Roof
3	425	141	56	16	46	1	7
16	48	48	24	24	48	4	24	12
0.3125	0.3125	0.3125	0.3125	0.3125	0.006	.06	0.3125	.13
Reflective	Reflective	Reflective	Reflective	Reflective	Reflective	Reflective	Reflective	Radiant barrier