Meet Owens Corning Thermafiber Fire & Sound Guard Plus mineral wool insulation—a durable, fire-resistant, and quietly effective solution for thermal comfort and sound control in both homes and light commercial spaces. Designed for interior and exterior walls, ceilings, basement walls, and crawl spaces, it delivers dependable performance with a touch of practical wit. Note: If you require delivery to ID, MT, OR or WA, pricing and delivery may vary, so be sure to select the correct zone.

Key Features & Design

• Material — Thermafiber® Fire & Sound Guard® Plus mineral wool insulation. Non-combustible, moisture-resistant, non-corrosive, non-deteriorating, and mold-resistant for long-lasting peace of mind.
• Applications — Ideal for interior and exterior walls, ceilings, basement walls, and crawl spaces. Your walls deserve a sturdy, all-weather hero.
• Thermal & Acoustic Performance — Energy-saving thermal insulation with exceptional sound absorption to keep conversations private and budgets sensible.
• Fire Resistance — Fire-resistant protection adds a reliable layer of safety to living and working spaces.
• Ease of Installation — Easy to cut with a serrated knife, then measure, squeeze, insert, and let it expand to a snug fit. It’s not glamorous, but it gets the job done—and quickly.

Available Sizes & Coverage

• 3.5" x 15" x 47" — 39.2 sq ft per bag; 8 batts per bag; Application: Wood
• 3.5" x 16" x 48" — 42.67 sq ft per bag; 8 batts per bag; Application: Steel
• 3.5" x 23" x 47" — 60.06 sq ft per bag; 8 batts per bag; Application: Wood
• 3.5" x 24" x 48" — 64 sq ft per bag; 8 batts per bag; Application: Steel

Installation & Fit

• Measure & Cut — Fire & Sound Guard® Plus 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 joists.
• Squeeze & Insert — Fire & Sound Guard® Plus insulation is flexible and pliable; simply squeeze the sides to compress the insulation and insert into the desired wall.
• Release & Expand — Once in place, Fire & Sound Guard® Plus insulation naturally expands to fill in the space, creating a snug, custom fit.

Product Applications

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