UltraBatt™ Insulation

Thermafiber® UltraBatt™ mineral wool insulation provides excellent thermal insulation, fire protection and noise control in residential and light commercial buildings.

UltraBatt™ Insulation is designed for use within wood and steel framed exterior wall, ceiling and floor construction assemblies.


UltraBatt Insulation Diagram

  • Exterior Ceilings
  • Attics
  • Exterior Walls
  • Basement Walls
  • Exposed Floors (not shown)

Download our Product and Installation Guide for a step-by-step guide on various product applications.

UltraBatt™ Consumer Data Sheet
UltraBatt™ Technical Data Sheet
Thermafiber® UltraBatt™ Specification
Thermafiber® Testimonials
Thermafiber FAQs

The semi-rigid batts are denser than traditional batts, making them easy to cut and install, with a secure cavity fit.

Thermafiber® Video


Measure & Cut: UltraBatt™ insulation is easy to cut with a serrated knife for custom fitting around electrical boxes, pipes, duct-work, wiring, or between non-standard studs and joist.

Squeeze & Insert: UltraBatt™ insulation is flexible and pliable; simply squeeze the sides to compress the insulation and insert into the desired wall.

Release & Expand: Once in place, UltraBatt™ insulation naturally expands to fill in the space, creating a snug, custom fit.

UltraBatt Product Image

UltraBatt™ insulation is available in a variety of sizes and R-values for your project.

Standard Sizes



Thermafiber UltraBatt Coverage Charts

Assembly STC & Fire Resistance Ratings

Contact our technical team for assistance with selecting acoustic and fire rated assemblies on your next project.