Help protect your home from fire.

Discover why fire-resistant insulation is essential for home hardening, where to install it for maximum protection, and which ROCKWOOL solutions defend every area of your home.

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It's just insulation, until it helps protect your home from fire

ROCKWOOL stone wool insulation doesn't just regulate temperature, it helps protect from fire, sound, and moisture, and is the only thermal insulation certified by the California Office of the State Fire Marshal.

Made from volcanic rock, our fire-resistant insulation withstands temperatures above 1,800°F without contributing to flame spread or producing toxic smoke, giving your home built-in fire protection.

Key benefits of ROCKWOOL stone wool insulation:

Fire-resistant: Won't burn or release toxic gases, helping slow fire spread
Moisture-repellent: Helps prevent mold and mildew growth and rot due to moisture
Sound-absorbing: Creates quieter, more peaceful living spaces
Durable performance: Maintains shape and performance for the life of your home
Sustainable: Stone wool is made from one of the world’s most abundant resources and is endlessly recyclable

Active vs. passive fire protection: Why you need both

While active fire protection systems like smoke detectors, fire extinguishers, and sprinkler systems alert you to danger and suppress flames, passive fire protection like noncombustible insulation, fire-resistant façade systems, and fire-rated doors works silently in the background.

Our fire-resistant products help slow fire spread through your home's structure, compartmentalizing risk and enhancing overall fire safety. Together, active and passive fire protection create a comprehensive safety system—but only passive protection is working 24/7 without maintenance or monitoring.

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Home hardening: Using fire-resistant materials

Home hardening means preparing your property to withstand fire threats before they arrive—whether from wildfires, neighboring structure fires, or interior incidents. It's about creating multiple layers of protection using fire-resistant materials and smart design choices that work together to defend your home.

Understanding fire's attack patterns

Effective home hardening starts with understanding that fire can attack from any direction:

Embers landing on your roof
Radiant heat threatening exterior walls
Flames spreading through interior spaces

By choosing noncombustible insulation like ROCKWOOL stone wool for all critical areas—roof, walls, and floors—you create a comprehensive fire protection system.

Combined with fire-resistant roofing, ember-resistant vents, and careful management of landscaping and vegetation, stone wool insulation delivers thermal and fire control measures that help protect your home when fire threatens.

Where fire protection matters most in your home

Fire doesn't follow a single path—it can threaten from outside, spread through interior spaces, or travel between floors. That's why comprehensive fire safety means insulating at every critical point, creating multiple assemblies that work together to slow fire spread and protect your home's structure.

First line of defense: Fire-resistant roofs and attics

Your roof is your home's first line of defense against airborne embers and external fire threats that can travel from neighboring properties or wildfire zones.

ROCKWOOL offers noncombustible insulation to support overhead protection. Comfortbatt® installed in attic spaces helps create fire-resistance from within, while Comfortboard® can be applied to roof exteriors for continuous insulation above the deck.

Edited Randy Rand roofing photo - Siga removed

Contain the threat: Fire-resistant interior walls, floors and ceilings

Once fire enters a home, interior walls and floors become critical containment zones for fire safety.

ROCKWOOL Safe'n'Sound® is specifically designed for these interior applications, compartmentalizing fire risk by slowing spread between rooms and floors. Install this fire-resistant insulation in walls around:

Bedrooms and sleeping areas
Furnace rooms and mechanical spaces
Electrical panels
Between floors and ceilings

Shield from the outside: Fire-resistant exterior walls

Your exterior walls are your home's protective shell against wildfires, neighboring structure fires, and other external threats.

ROCKWOOL Comfortboard® and Comfortbatt® create a noncombustible layer that aids in defending against exterior fire sources while helping to prevent interior fires from breaking through. This continuous exterior insulation provides passive fire protection while delivering superior moisture management and thermal performance.

First time using this, and I am impressed with the sound barrier it provides. The peace of mind knowing that it helps slow fires is also a great benefit… Will definitely recommend to others.

Tina

Homeowner

Choose ROCKWOOL products for every part of your home—engineered to deliver fire-resistant performance where it matters most.

Interior walls, floors and ceilings

Safe'n'Sound®

ROCKWOOL Safe'n'Sound® is a stone wool batt insulation designed for superior fire resistance and acoustic performance in interior wall cavities, floors and ceilings in both wood and steel frame construction.

Attic & exterior wall cavities

Comfortbatt®

ROCKWOOL Comfortbatt® is a stone wool batt insulation designed for thermal performance in exterior wall cavities, exposed floors, basements/crawlspaces and attic applications in both wood and steel framing.

Exterior walls and roof

Comfortboard®

ROCKWOOL Comfortboard® is a rigid stone wool insulation board engineered for continuous insulation applications. It's designed to be used in above-grade walls, below-grade foundation walls, under concrete slabs and in pitched roof applications.

Frequently asked questions about fire-resistant insulation

What's the difference between fire-resistant and fireproof?

Do I need fire-resistant insulation if I have smoke detectors and sprinklers?

Is ROCKWOOL insulation required by building codes for fire safety?

Can I retrofit my existing home with fire-resistant insulation?

What are Wildland-Urban Interface (WUI) zones and why do they require special building considerations?

WUI zones are areas where residential development meets wildland vegetation, creating higher wildfire exposure risk. These areas require special building considerations because they face threats from embers, radiant heat, and direct flame contact. Building codes in WUI zones emphasize fire-resistant materials, defensible space, and home hardening strategies to reduce ignition risks and improve structural survival rates during wildfire events.