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ROXUL
ROXUL 40220 Mineral Wool High Temperature Insulation 3 in x 48 in x 24 in

ROXUL 40220 Mineral Wool High Temperature Insulation 3 in x 48 in x 24 in

4.7(25 ratings)

Last price we saw

$223.95at Zoro, last seen Nov 7

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Our take on the ROXUL 40220 Mineral Wool High Temperature Insulation 3 in x 48 in x 24 in

ROXUL 40220 is a 3-inch-thick, 2-by-4-foot board of mineral wool (stone wool) insulation with an R-value of about 12. It is unfaced, rigid enough to stand on edge, and rated for 0°F to 1200°F, so it suits high-temperature and fire-resistant assemblies as well as sound control. At 8 lb/cu ft it is dense and heavy for its size, which is the trade-off for its heat and acoustic performance.

Best forHigh-temperature walls and equipment surroundsFire-rated and sound-dampening wall assembliesBasement, garage and rim-joist insulationBuyers who want unfaced, moisture-resistant board
Pros
  • Rated 0°F to 1200°F for hot-side applications
  • R-value of about 12 at 3 inches
  • Mineral wool resists moisture and does not support mold
  • Unfaced board cuts cleanly and holds its shape
  • Dense 8 lb/cu ft board also blocks sound
Cons
  • Dense and heavy; awkward to handle overhead
  • 3-inch thickness eats interior space
  • Unfaced surface needs a cover where exposed
  • Costs more than common fiberglass batts
  • Dust and itch require gloves, long sleeves and a mask

ROXUL 40220 Mineral Wool High Temperature Insulation 3 in x 48 in x 24 in prices at every store

  • ZoroCheck price at Zoro

ROXUL 40220 Mineral Wool High Temperature Insulation 3 in x 48 in x 24 in price history

Lowest price we've seen: $223.95 on Nov 7 at Zoro. Tracked across 1 store since Nov 7.

What reviewers say

  • 4.7 / 525 ratings

Rated 4.7 out of 5 from 25 ratings. Buyers rate it highly for heat resistance and rigidity, with the main complaints being weight and price.

What people mention
  • Heat resistancePraisedBuyers say it handles high-temperature applications that fiberglass cannot.
  • RigidityPraisedThe dense board holds its shape and stays put in vertical cavities.
  • SoundPraisedOwners report it quiets rooms and equipment noise.
  • WeightCriticisedBuyers find the 8 lb/cu ft board heavy and hard to handle, especially overhead.
  • PriceCriticisedSome say it costs noticeably more than standard fiberglass insulation.

Specifications

Density
8 lb/cu ft
Thickness
3 in
Approx. R Value
12
Color
Green
Facing Material
Unfaced
Foam Cell Type
Open
Form
Board
Length

Questions and answers

What R-value does the 3-inch board give?
About R-12 at 3 inches thick. That is lower per inch than some rigid foam, but it holds up at high temperatures foam cannot.
Can it be used around a fireplace or stove?
It is rated from 0°F to 1200°F and is commonly used for high-temperature shielding. Follow the appliance maker's clearance and listing requirements.
Does it need a vapor barrier?
It is unfaced, so in exterior walls add a vapor retarder per local code. Mineral wool itself resists moisture and does not support mold.
How many boards come in a pack?
Listings vary; check the pack quantity before ordering. Each board covers 8 square feet (2 ft by 4 ft).
Is it safe to handle without protection?
Wear gloves, long sleeves, eye protection and a mask. Mineral wool fibers can irritate skin and lungs, especially when cut.
What do buyers say about the ROXUL 40220 Mineral Wool High Temperature Insulation 3 in x 48 in x 24 in?
Rated 4.7 out of 5 from 25 ratings.

Stores we've priced the ROXUL 40220 Mineral Wool High Temperature Insulation 3 in x 48 in x 24 in at

  • Zoro deals and prices
48 in
Minimum Operating Temperature
0 Degrees F
Moisture Absorption
No
Overall Length
4 ft
Overall Width
24 in
R Value
12
Strength
Medium
Temp. Range
0 Degrees F to 1200 Degrees F
Width
24 in