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Knauf R-19 Unfaced Fiberglass Insulation Roll 15 in. x 39 ft

Knauf R-19 Unfaced Fiberglass Insulation Roll 15 in. x 39 ft

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$69.69at ZoroObserved at 2:12 PM

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Our take on the Knauf R-19 Unfaced Fiberglass Insulation Roll 15 in. x 39 ft

This is a single 15 in. x 39 ft 2 in. roll of unfaced fiberglass insulation with an R-19 rating, covering about 49 sq ft at 6.25 in. thick. It is made with ECOSE binder, is formaldehyde-free and GREENGUARD Gold certified, and uses recycled glass. Unfaced rolls like this are meant for wall cavities and between-floor spaces where no vapor retarder is built in. At $69.69 at Zoro as of November 4, 2026, it is the only new price we have on record, so there is no recent range to compare it against.

Best forFilling 2x6 wall cavities to R-19Sound control in interior walls and floorsOwners who want a formaldehyde-free, low-odor battDIY jobs where a 15 in. width fits the framing
Pros
  • R-19 in a 6.25 in. thickness suits 2x6 framing
  • Formaldehyde-free ECOSE binder, GREENGUARD Gold certified
  • Made partly from recycled glass
  • Unfaced design lets you add your own vapor retarder
  • Roll format is quick to cut and fit between studs
Cons
  • Unfaced: no built-in vapor barrier, so you supply one where code requires it
  • Fiberglass still needs gloves, eye protection and a mask to install
  • One roll covers only about 49 sq ft, so a whole room takes several
  • 15 in. width is narrower than standard 16 in. on-center stud spacing

Knauf R-19 Unfaced Fiberglass Insulation Roll 15 in. x 39 ft prices at every store

  • ZoroNew

    In stock

    $69.69Observed at 2:12 PM
    Visit store

Also available at

  • eBayCheck price at eBay
  • Carr HardwareCheck price at Carr Hardware
  • DK HardwareCheck price at DK Hardware
  • Do it BestCheck price at Do it Best
  • Home CentralCheck price at Home Central
  • Ideal True Value Home CenterCheck price at Ideal True Value Home Center
  • True ValueCheck price at True Value
  • ArborCheck price at Arbor

Knauf R-19 Unfaced Fiberglass Insulation Roll 15 in. x 39 ft price history

Lowest price we've seen: $30.23 on Nov 4 at Arbor. Tracked across 9 stores since Nov 4.

Specifications

Form
Rolls
Product Type
Fiberglass Insulation
Insulation Type
Thermal, Acoustic
Insulated Plasterboard
No
Material Type
Fiberglass
Facing
Unfaced
Material Composition
Formaldehyde-free
R-Value
R-19
Suitable Surfaces
Interior walls, Between floors
Coverage Area
48.96 sq ft/pack
Thickness
6.25"
Length
39'2"
Roll Size
15 in. x 39 ft.
Width
15 in.
Certifications
GREENGUARD gold certified
Environmental Rating
Gold
Recycled Content
Recycled glass
Weight
12.73
Color
Naturally brown
Solution For
Sound control

Questions and answers

Is R-19 enough for an exterior 2x6 wall?
R-19 fills a 2x6 cavity completely, which is the common target for that depth. Check your local code for the required R-value and vapor retarder in your climate zone.
Do I need a vapor barrier with this roll?
Yes, in most exterior wall and ceiling applications. This roll is unfaced, so you add a separate vapor retarder or use it only where your assembly and code allow.
How many rolls do I need?
Each roll covers about 49 sq ft. Measure the square footage of the cavities you are filling and divide by 49, then round up for cuts and waste.
Will it fit 16 in. on-center studs?
The roll is 15 in. wide, so it fits a 16 in. on-center cavity with a small gap at each side. For friction-fit batts, look for a 15 in. product sized to that spacing or cut and piece carefully.
Does it help with noise?
Yes. Knauf rates it for acoustic as well as thermal use, and fiberglass batts in interior walls and between floors reduce sound transfer.
When is the best time to buy?
Insulation prices move with seasonal demand, and bundles are often discounted in fall. The only new price we have is $69.69 at Zoro as of November 4, 2026.
Where is the Knauf R-19 Unfaced Fiberglass Insulation Roll 15 in. x 39 ft cheapest?
At Zoro, for $69.69, as of our latest check.
Where can I buy the Knauf R-19 Unfaced Fiberglass Insulation Roll 15 in. x 39 ft?
9 stores we checked sell it, including Zoro, eBay, Carr Hardware, DK Hardware, Do it Best.

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