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Model #UB-40-P7A-15--47--121

Store SKU #1005429534

R-30 15 in. x 47 in. Thermafiber UltraBatt Unfaced Mineral Wool Insulation Batt (24-Bags)

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$undefined.00 /mo* suggested payments with months* financingApply Now
  • R-30 Mineral wool batt can be installed within exterior 2x8 wall
  • Easy to cut and install, even around construction irregularities
  • Fire resistant, mold resistant and non-corrosive
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Product Overview

Thermafiber fire resistance icon

Fire Resistance

Non-combustible insulation resists fire and temperatures in excess of 2000F, giving you more time to get out in the event of a fire.

Thermafiber sound performance icon

Sound Insulation

Outstanding acoustic insulation designed to reduce noise and absorb sound traveling from room to room.

Thermafiber mold icon

Mold Resistant

Mineral Wool is made of an inorganic material that will not promote the growth of mold or retain moisture.

Supplies needed for Thermafiber project

Easy to Install

Thermafiber insulation is easy to install with minimal PPE required.

diagram of Thermafiber install

Measure and Cut

Thermafiber insulation is easy to cut with a serrated knife for custom fitting around electrical boxes, pipes, ductwork, wiring or between nonstandard studs and joists.

diagram of Thermafiber Install

Squeeze and Insert

Thermafiber insulation is flexible and pliable; simply squeeze the sides to compress the insulation and insert into the desired wall.

diagram of Thermafiber install

Release and Expand

Once in place, Thermafiber insulation naturally expands to fill in the space, creating a snug, custom fit.

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Recycled Content

Thermafiber Mineral Wool Insulation is composed of at least 70% recycled content which means you can help protect your home while protecting the environment.

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Benefits of Mineral Wool

Thermafiber Mineral Wool Insulation products are non-combustible, mold-resistant, non-corrosive and non-deteriorating. (ASTM C 1338)

Thermafiber Fire and Sound package

Thermafiber Fire and Sound Guard

Thermafiber Fire and Sound Guard insulation is designed to provide exceptional acoustical control and fire resistance.

House diagram for Thermafiber Fire and Sound

Where to Install

Thermafiber Fire and Sound Guard insulation is for use in interior walls, floors and ceilings.

Thermafiber UltraBatt Package

Thermafiber UltraBatt

Thermafiber UltraBatt insulation is a dense, semi-rigid batt designed to provide excellent thermal insulation, fire resistance and noise control.

House diagram for Thermafiber UltraBatt

Where to Install

Thermafiber UltraBatt insulation is for use in exterior walls, ceilings, cathedral ceilings, basement walls and crawlspaces.

Thermafiber UltraBatt mineral wool is designed to provide excellent thermal insulation in residential and light commercial building. The semi-rigid batts are more dense than traditional batts or rolls and are quick and easy to install. UltraBatt products are non-combustible, moisture-resistant, non-corrosive and mold resistant.
  • Unfaced insulation: does not have a vapor retarder
  • Flexible insulation is easy to cut and install, allowing it to conform to building shapes and construction irregularities
  • Mold resistant
  • Provides fire resistance
  • Thermafiber insulation reduces the transfer of heat and cold through building structures to provide thermal comfort and continuous energy savings
  • Step 1 of installation: measure and cut insulation
  • Step 2 of installation: squeeze and insert insulation into desired space
  • Step 3 of installation: release and let product expand within the wall
  • Shop all Owens Corning Thermafiber Mineral Wool Insulation here
  • California residents

Info & Guides

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Cover Area Per Bag (sq. ft.)
14.7 ft²
Coverage Area (sq. ft.)
14.7 ft²
Product Length (ft.)
3.91 ft
Product Thickness (in.)
7.13 in
Product Width (in.)
15 in


Bag Size
3.9 ft. x 25 in. x 15 in.
Batt/Roll Size
3.91 ft. x 7.13 in. x 15 in.
Compatible Install Surface
Faced or Unfaced
Insulation Features
Fire Block Rated,Formaldehyde Free,Formaldehyde Free
Insulation Location
Ceiling Insulation,Ceiling Insulation,Floor,Floor
Insulation R-Value
Insulation Type
Number of Pieces
Pack Size
Product Weight (lb.)
25.3 lb
Roll or Batt

Warranty / Certifications

Warranty Information
3-Year Limited

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

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