ROCKWOOL stone wool insulation commercial installation

Stone Wool Insulation Since 1937

ROCKWOOL Stone Wool — Thermal, Acoustic & Fire Insulation

Engineered from volcanic basalt rock, ROCKWOOL insulation delivers non-combustible fire resistance, superior acoustic performance, and market-leading thermal efficiency — in a single product system.

Euroclass A1 Non-Combustible NRC up to 1.05 λ from 0.033 W/(m·K) EUCEB Certified

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ROCKWOOL stone wool insulation product cross-section

Fire Resistance Tested at 1,000°C+ — Euroclass A1

Thermal Performance λ as low as 0.033 W/(m·K)

Acoustic Insulation NRC 0.95–1.05 certified

Sustainable Origin Made from volcanic basalt — recyclable

Applications Across Sectors

Where Does ROCKWOOL Stone Wool Perform?

From high-rise commercial towers to industrial process plants, data centers to healthcare facilities — ROCKWOOL insulation systems are specified by engineers and architects who demand measurable performance.

Commercial

Office buildings, hotels, retail

Residential

Homes, apartments, retrofits

Industrial

Process plants, warehouses

Healthcare

Hospitals, clinics, labs

Data Centers

Server halls, cooling zones

Infrastructure

Tunnels, bridges, transit

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Product Systems

ROCKWOOL Insulation Product Range

Each product system is independently tested and third-party certified for thermal resistance, fire performance, and acoustic attenuation — with documented technical data sheets available on request.

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Thermal

COMFORTBATT® Stone Wool Batts

Friction-fit semi-rigid batts for wood and steel frame walls, floors, and ceilings. R-15 to R-23 per standard thickness. Water-repellent treatment standard.

Thermal + Fire

COMFORTBOARD™ 80 Rigid Boards

High-density rigid exterior insulation boards for continuous insulation applications. λ = 0.036 W/(m·K). Tested per ASTM E84 flame spread index ≤ 5.

Acoustic

SAFE'N'SOUND® Acoustic Batts

3.5" and 5.5" batts engineered for interior partition walls. STC 52 tested system. NRC 1.05. Recommended by acoustic engineers for music studios, hotels, and multi-family residential.

Fire Protection

ROCKWOOL FirePro™ Structural Systems

Certified passive fire protection for structural steel columns and beams. Tested to EN 13381-4 and ASTM E119. Provides up to 240 minutes of rated fire resistance.

Facade

CONROCK® Exterior Wall System

High-density facade insulation slabs with hydrophobic treatment for EIFS and rainscreen cladding applications. Wind load rated. Compatible with major cladding systems.

ROCKWOOL flat roof insulation installation

Roofing

TOPROCK® Flat Roof Insulation

Dual-density stone wool boards for flat and low-slope roof decks. Upper layer density ≥ 160 kg/m³ for foot traffic. Tested per ASTM D1621 compressive resistance ≥ 80 kPa.

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Volcanic basalt rock — raw material for ROCKWOOL stone wool

Sustainability & Environmental Performance

Insulation from Earth.
Performance for Generations.

ROCKWOOL stone wool begins as abundant volcanic basalt rock and returns to earth at end-of-life. Our closed-loop manufacturing processes and energy payback period of less than 6 months for a full building lifetime make stone wool insulation a net-positive environmental choice.

Net-Zero Manufacturing Roadmap by 2030

Investment in electric kiln technology and green energy sourcing targets Scope 1 & 2 carbon neutrality across all 38 global production sites.

6-Month Energy Payback Period

Life cycle analysis confirms the embodied carbon in stone wool insulation is offset within 6 months of building operation — compared to a 50-year building lifetime.

EUCEB Certified — Biosolubility Verified

All ROCKWOOL stone wool fiber is EUCEB (European Certification Board for Mineral Wool Products) certified, verifying biosoluble composition and human safety standards per WHO guidelines.

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Specified by Professionals

What Engineers & Architects Are Saying

We specified ROCKWOOL COMFORTBOARD 80 for a 28-story residential tower in Chicago. The continuous exterior insulation eliminated thermal bridging that would have cost us 0.4 R-value per unit — a significant impact on energy code compliance. The third-party test data made specification approval straightforward.

Marcus Renfield, PE

Envelope Performance Engineer — Trident Building Science LLC

The SAFE'N'SOUND acoustic batts reduced STC transmission by 9 points compared to the standard cavity fill we'd previously used. We tested it in a multi-family mid-rise project — 48 units, zero complaints about party wall sound after six months of occupancy. That doesn't happen without serious material performance.

Diana Holt

Principal Architect — Meridian Residential Design Group

For our pharmaceutical manufacturing client, fire-rated passive protection was non-negotiable. ROCKWOOL FirePro provided documented 180-minute steel column fire resistance — tested to EN 13381-4. The technical support team had site-specific load calculations ready within three days of our first inquiry.

Tomas Wiesner

Senior Fire Safety Engineer — Proaxis Industrial Consultants

Common Questions

Technical FAQ — ROCKWOOL Stone Wool Insulation

ROCKWOOL stone wool is manufactured from volcanic basalt rock melted at approximately 1,600°C and spun into fine fibers. Unlike fiberglass (made from silica sand), stone wool has a higher melting point, which is the basis for its non-combustibility classification under EN 13501-1 Euroclass A1. Stone wool also tends to offer higher acoustic NRC values (0.95–1.05) compared to fiberglass batts at equivalent density. Both materials require no vapor barrier in most above-grade wall assemblies, but stone wool has documented lower moisture absorption rates per ASTM C1104.

ROCKWOOL COMFORTBATT achieves approximately R-3.0 to R-3.3 per inch, depending on product line and installation condition. COMFORTBOARD 80 rigid board achieves R-3.0 per inch. For a standard 2×6 wall (5.5" cavity), COMFORTBATT delivers R-23; a 1.5" layer of COMFORTBOARD 80 adds R-4.5 as continuous exterior insulation. Actual R-value in field conditions depends on installation quality and thermal bridging mitigation. We recommend consulting our technical data sheets for ASTM C518 and ASTM C177 test conditions.

ROCKWOOL stone wool is classified as non-combustible under EN 13501-1 Euroclass A1 — the highest classification for fire performance. In North America, products meet the ASTM E136 test standard for non-combustibility. The term "fireproof" is technically discouraged in fire engineering (no material is absolutely fireproof under all conditions), but stone wool does not ignite, does not contribute to fire spread, and does not produce toxic fumes during standard building fire scenarios. Passive fire protection products (FirePro series) carry rated fire resistance tested to EN 13381-4 and ASTM E119.

In most above-grade wall assemblies in moderate climate zones (ASHRAE Climate Zones 1–4), a vapor barrier is not required with ROCKWOOL stone wool. The hydrophobic treatment ensures bulk water resistance (ASTM C1104 — moisture absorption less than 1% by volume). In cold climates (Zones 5–8) or below-grade applications, a vapour control layer may be required by code depending on wall assembly design. ROCKWOOL does not retain moisture when wetted and will return to full performance once dry — unlike fiberglass, which can lose R-value with moisture exposure.

Spray polyurethane foam (SPF) offers higher R-value per inch (R-6 to R-7 for closed-cell vs R-3.0–3.3 for stone wool batts). However, SPF is combustible and typically requires a thermal/ignition barrier, adding cost. Stone wool does not require this barrier, is non-combustible, provides equivalent acoustic performance, and has a documented lower global warming potential (GWP) based on Environmental Product Declarations (EPDs). For projects with fire-compartmentalization requirements, stone wool is often the preferred specification choice. ROCKWOOL can provide comparative life cycle analysis upon request.