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Deal.ai › ROCKWOOL › Stone Wool Insulation
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Rockwool COMFORTBATT R-23 Attic Wall Unfaced Stone Wool Batt Insulation 39.8-sq ft (15.25-in W x 47-in L) RXCB551525

Rockwool COMFORTBATT R-23 Attic Wall Unfaced Stone Wool Batt Insulation 39.8-sq ft (15.25-in W x 47-in L) RXCB551525

Best price now

$89.98at The Home DepotVerified

Compared across 2 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.

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Our take on the Rockwool COMFORTBATT R-23 Attic Wall Unfaced Stone Wool Batt Insulation 39.8-sq ft (15.25-in W x 47-in L) RXCB551525

Rockwool Comfortbatt R-23 is unfaced stone wool batt insulation for attics, walls and floors, sold in a 39.8 sq ft pack of 5-1/2 in thick batts. Stone wool resists fire and moisture better than fiberglass and cuts with a serrated blade. The best new price is $89.98 at The Home Depot as of November 7, 2026, with two stores listing it new.

Best forAttic and wall retrofits needing R-23DIY installers who want friction-fit battsHomeowners in humid or fire-prone areasSoundproofing interior walls
Pros
  • R-23 rating suits 2x6 framing and attic upgrades
  • Stone wool is non-combustible and tolerates high heat
  • Handles moisture without sagging or losing R-value
  • Friction-fits between studs and cuts cleanly
  • Denser and quieter than fiberglass batts
Cons
  • Pricier per square foot than fiberglass
  • Heavier and itchier to handle than fiberglass
  • 5-1/2 in thickness needs 2x6 cavities
  • Unfaced, so it needs a separate vapor barrier in some assemblies

Rockwool COMFORTBATT R-23 Attic Wall Unfaced Stone Wool Batt Insulation 39.8-sq ft (15.25-in W x 47-in L) RXCB551525 prices at every store

  • The Home DepotNew

    In stock

    $89.98Free shippingVerified
    Visit The Home Depot
  • Lowe'sNew

    In stock

    $89.98Free shippingVerified
    Visit Lowe's

Store links may earn us a commission. Some prices via Klarna.

Rockwool COMFORTBATT R-23 Attic Wall Unfaced Stone Wool Batt Insulation 39.8-sq ft (15.25-in W x 47-in L) RXCB551525 price history

Lowest price we've seen: $89.98 on Nov 7 at The Home Depot. Tracked across 2 stores since Nov 7.

What reviewers say

Owners of Rockwool Comfortbatt generally rate it highly for ease of cutting, friction fit and sound deadening. Complaints center on cost and the dust and itch during installation.

What people mention
  • InstallationPraisedOwners say the batts friction-fit between studs and cut cleanly with a serrated knife.
  • SoundPraisedReviewers report noticeably quieter rooms after insulating interior walls.
  • PriceCriticisedBuyers say it costs more per square foot than fiberglass batts.
  • HandlingMixedIt is denser and heavier than fiberglass, and some find it dusty and itchy to install.
  • MoisturePraisedOwners in damp basements and attics say it holds up without sagging.

Specifications

Area of Use
Ceiling, Floor, WallSource
R-Value
R23Source
Coverage Area
39.8Source
Width
47Source

Questions and answers

Is R-23 enough for an attic?
R-23 suits 2x6 wall cavities and some floor or attic assemblies, but most attics need R-38 to R-60 depending on climate zone. Check your local code before buying.
How many packs do I need?
Each pack covers 39.8 sq ft. Divide your wall or attic area by 39.8 and round up, adding about 10 percent for cuts and waste.
Can I use it in a 2x4 wall?
No. At 5-1/2 in thick it is made for 2x6 framing. Compressing it into a 2x4 cavity lowers its R-value.
Does it need a vapor barrier?
The batts are unfaced, so most wall and ceiling assemblies need a separate vapor retarder. Follow local code for your climate.
Is it better than fiberglass?
It costs more but resists fire and moisture better and deadens sound more. Fiberglass is cheaper and lighter for budget jobs.
When is it cheapest?
The best new price was $89.98 at The Home Depot as of November 7, 2026. Insulation often drops during fall and spring energy-efficiency promotions.
Where is the Rockwool COMFORTBATT R-23 Attic Wall Unfaced Stone Wool Batt Insulation 39.8-sq ft (15.25-in W x 47-in L) RXCB551525 cheapest?
At The Home Depot, for $89.98, as of our latest check.
Where can I buy the Rockwool COMFORTBATT R-23 Attic Wall Unfaced Stone Wool Batt Insulation 39.8-sq ft (15.25-in W x 47-in L) RXCB551525?
2 stores we checked sell it, including The Home Depot, Lowe's.

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Compare the Rockwool COMFORTBATT R-23 Attic Wall Unfaced Stone Wool Batt Insulation 39.8-sq ft (15.25-in W x 47-in L) RXCB551525

  • Rockwool COMFORTBATT R-23 Attic Wall Unfaced Stone Wool Batt Insulation 39.8-sq ft (15.25-in W x 47-in L) RXCB551525 vs Rockwool SAFE 'n' SOUND Attic Wall Unfaced Stone Wool Batt Insulation 59.7-sq ft (15.25-in W x 47-in L) RXSS31525
  • Rockwool COMFORTBATT R-23 Attic Wall Unfaced Stone Wool Batt Insulation 39.8-sq ft (15.25-in W x 47-in L) RXCB551525 vs RXCB3523 R15 24x47 Bat Insulation

Stores we've priced the Rockwool COMFORTBATT R-23 Attic Wall Unfaced Stone Wool Batt Insulation 39.8-sq ft (15.25-in W x 47-in L) RXCB551525 at

  • Home Depot deals and prices
  • Lowe's deals and prices

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Thickness
5-1/2Source
Material
Stone WoolSource
Temperature Rating
2150Source
Type
BattSource
Length
3.91Source