Owens Corning

mineral wool with Fire and sound protection

THERMAL COMFORT & SOUND CONTROL

Thermafiber® Fire & Sound Guard® Plus is the first hybrid mineral wool batt insulation that offers thermal performance, noise control, and fire resistance for residential and commercial construction applications. These mineral wool insulation batts can be used for both interior and exterior walls, floors, and ceilings.

This trusted insulation maintains the fire, sound, and thermal performance and is available formaldehyde-free. Owens Corning is known for while supporting sustainable building practices at a competitive price.

Key benefits of these mineral wool batts:

  • Fire Resistant – Non-combustible
  • Mold and Mildew Resistant – Non-corrosive
  • Easy Installation – Lightweight, flexible, & easy to cut
  • Energy Efficient – Helps reduce heat loss and improve comfort
  • Sound Absorption – Limits noise transfer for quieter spaces
  • Code Compliant – NFPA 101 Class A-rated & ASTM-tested

Packages of Thermafiber® Fire & Sound Guard® Plus

Performance attributes

Crafted to assist with thermal comfort, these mineral wool insulation batts help regulate indoor temperatures for improved energy efficiency and comfort. This non-combustible mineral wool fire insulation is tested to meet fire safety standards, including compliance with ASTM C665. It also functions as mineral wool sound insulation, creating a quieter environment and helping to reduce noise transmission between rooms. In addition to fire and sound insulation, these mineral wool batts are moisture—and mold-resistant (tested per ASTM C1338), contributing to long-term performance.

Thermal comfort icon

Thermal comfort

Fire resistant & Non-combustible icon

Fire Resistant & Non-Combustible

Acoustic control icon

Acoustic Control

Mold resistant icon

Mold resistant

Technical Information

STANDARDS, CODE COMPLIANCE

  • NFPA 101, Class A-rated interior finish
  • ASTM C665, Mineral Fiber Thermal Insulation for Buildings, Type 1 Compliant


pHYSICAL PROPERTIES

Property

Test Method

Value

Corrosion of Steel, Aluminum, and CopperASTM C665Complies
Non-CombustibilityASTM E136Complies
Non-CombustibilityCAN/ULC S114Complies
Water Vapor PermeanceASTM E96

Unfaced, 50 perms as tested
Foil-Faced, 0.02 perms as tested

Water Vapor SorptionASTM C1104Sorption less than 1% by volume
Surface Burning CharacteristicsASTM E84

Unfaced, Flame Spread 0
Smoke Developed 0

Foil-Faced, Flame Spread 25
Smoke Developed 0

Surface Burning CharacteristicsCAN/ULC S102

Unfaced, Flame Spread 0
Smoke Developed 0

Fungi ResistanceASTM C1338Complies

applications

This mineral wool batt insulation is ideal for walls, ceilings, floors, and basements, supporting thermal efficiency, sound control, and fire resistance. In interior acoustics applications, it helps reduce noise transfer in walls, ceilings, and floors, making it an excellent choice for multi-family housing, offices, and other sound-sensitive environments. Its fire-resistant properties also make it a strong solution for fire-rated assemblies, such as stairwells, shaft walls, and multi-story ceilings and floors in light commercial and residential construction. This insulation offers versatile thermal, fire, and sound protection performance across various building applications.


  • Basements
  • Ceilings
  • Floors
  • Interior Acoustics
  • Interior Acoustics > Ceilings
  • Interior Acoustics > Floors
  • Interior Acoustics > Interior Walls
  • Walls

Contact Us

Even though we’re a global company, we’re always ready to answer your questions. Call to speak with an Owens Corning representative.