Rockwool FRONTROCK PLUS 100mm EWI Mineral Wool - 1.8m2 pack
What is ROCKWOOL Frontrock Plus?
ROCKWOOL Frontrock Plus is a premium, non-combustible stone wool insulation board specifically engineered for External Wall Insulation (EWI) and ETICS (External Thermal Insulation Composite Systems). Offering an outstanding thermal conductivity of 0.035 W/m·K and an A1 Euroclass fire rating, these dual-density boards provide exceptional thermal efficiency, superior acoustic damping, and ultimate fire safety for both residential and commercial facades
Key benefits
Ultimate Fire Safety: Euroclass A1 non-combustible rating. It will not burn, contributing to a safer building envelope.
Exceptional Thermal Performance: A low thermal conductivity (lambda) of 0.035 W/m·K significantly lowers heating bills and improves energy efficiency.
Superior Acoustic Insulation: The dense stone wool structure dramatically reduces external noise pollution, ensuring a quieter indoor environment.
Highly Vapour Permeable: Fully breathable materials allow moisture to pass through the external walls, preventing damp, mould, and condensation build-up.
Dimensionally Stable: Will not shrink, expand, or sag over time, preventing thermal bridging and ensuring long-lasting performance.
Eco-Friendly: Made from naturally occurring volcanic rock, highly durable, and fully recyclable.
Transform Your Facade with ROCKWOOL Frontrock Plus
Upgrading your building's exterior requires materials you can trust. ROCKWOOL Frontrock Plus is the industry-leading solution for external wall insulation (EWI). Designed for seamless integration into modern ETICS applications, this high-performance stone wool board acts as a robust shield against the unpredictable UK weather.
Why Choose Stone Wool for External Walls?
Unlike standard foam or EPS boards, ROCKWOOL Frontrock Plus offers a multi-benefit approach. Not only does it meet the strictest UK building regulations for thermal efficiency, but it also acts as a sound barrier for homes situated near busy roads or urban centres. Furthermore, its inherent breathability means your building's fabric remains dry, protecting the structural integrity of your property for decades to come.
Perfect for both new builds and the retrofitting of existing residential properties, Frontrock Plus boards are easy to cut, shape, and install, accommodating a wide variety of facade finishes and render systems.
Technical Specifications:
| Feature | Specification / Value | Standard |
| Material | Stone Wool (Rock Mineral Wool) | - |
| Thermal Conductivity (λ) | 0.035 W/m·K | EN 12667 |
| Reaction to Fire | Euroclass A1 (Non-combustible) | EN 13501-1 |
| Tensile Strength (TR) | TR10 kPa | EN 1607 |
| Compressive Strength | CS(10)20 kPa | EN 826 |
| Thickness Tolerance | Class T5 | EN 823 |
| Short-Term Water Absorption | ≤ 1.0 kg/m² | EN 1609 |
| Long-Term Water Absorption | ≤ 3.0 kg/m² | EN 12087 |
Q&A's:
Q: Can ROCKWOOL Frontrock Plus be used on any building? A: Yes, Frontrock Plus is highly versatile and is suitable for insulating the external walls of single-family homes, multi-storey residential blocks, and commercial buildings using certified ETICS/EWI systems.
Q: Is Frontrock Plus waterproof? A: While it is not designed to be left permanently exposed to the elements without a render finish, the boards have excellent water-repellent properties (short-term water absorption ≤ 1.0 kg/m²) and are highly vapour permeable, meaning they won't trap moisture.
Q: Do I need special tools to cut ROCKWOOL Frontrock Plus? A: No. The stone wool boards can be easily cut to size on-site using a standard insulation knife or a fine-toothed saw, making installation straightforward around windows, doors, and architectural details.
Q: Is ROCKWOOL Frontrock Plus safe for high-rise buildings? A: Absolutely. With a Euroclass A1 non-combustible fire rating, Frontrock Plus will not burn or contribute to the spread of fire. This makes it fully compliant with stringent UK building regulations for facades on buildings of any height, including high-rise residential blocks over 11 metres and 18 metres.
Q: How is Frontrock Plus fixed to the external wall? A: The boards are typically installed using a combination of highly engineered adhesive and mechanical fixings (such as insulation anchors). The exact fixing pattern will depend on the specific ETICS/EWI system you are using, the substrate, and the wind load calculations for your location.
Q: Will installing external stone wool insulation cause dampness inside my home? A: No, quite the opposite. Because Frontrock Plus is highly vapour permeable (often referred to as 'breathable'), it allows water vapour to travel through the external walls and escape outside. This helps to prevent interstitial condensation, damp, and black mould from forming inside the property.
Q: Does Frontrock Plus help with reducing traffic noise? A: Yes, significantly. The dense, multi-directional fibrous structure of ROCKWOOL stone wool naturally traps sound waves. Using it as part of an EWI system provides exceptional acoustic insulation, dramatically reducing airborne external noises like heavy traffic, aeroplanes, or urban street noise.
Q: What types of render can be applied over Frontrock Plus? A: Frontrock Plus acts as an excellent, dimensionally stable substrate for a wide variety of thin-coat render systems. To maintain the breathability of the entire wall structure, it is highly recommended to pair it with vapour-permeable finishes, such as silicone, silicate, or mineral renders.
Q: How long will ROCKWOOL Frontrock Plus last once installed? A: Stone wool is incredibly durable and dimensionally stable. It does not shrink, warp, or sag over time, nor is it affected by changes in temperature or humidity. When properly installed as part of a certified EWI system, the insulation will last for the lifetime of the building without a drop in thermal performance.
Q: Is ROCKWOOL Frontrock Plus an environmentally friendly choice? A: Yes. It is manufactured from naturally occurring and abundant volcanic rock (basalt) and recycled materials. It can be fully recycled at the end of its lifespan, and the energy it saves over the lifetime of a building vastly outweighs the energy used in its production.
Q: Why choose ROCKWOOL Frontrock Plus over EPS (polystyrene) boards? A: While EPS is widely used, ROCKWOOL Frontrock Plus offers three distinct advantages: it is entirely non-combustible (Euroclass A1 vs EPS's Euroclass E), it provides superior acoustic soundproofing, and it is fully breathable, making it a safer and more holistic choice for improving your building's overall fabric.
EWI