Superior Product Quality

Experience the best in SWI products.

Flexible Partnership

Adapting to your needs at every stage.

Industry Leadership

40+ years in the EWI industry

01942 717 100

Superior Product Quality

Experience the best in SWI products.

Flexible Partnership

Adapting to your needs at every stage.

Industry Leadership

40+ years in the EWI industry

A1 Direct Fix Steel Frame Stone Wool Mineral Render System

The Direct Fix Steel Frame System allows installation of A-rated systems to a sheathed steel frame substrate. Eliminating the need for a cavity and cavity fire-stopping behind the A1 Stone Wool insulation. Suitable for various projects like schools, student accommodations, and high-rise reclads, it has been popular since its 2022 launch.

Wetherby’s A1 EWI render system achieves the highest European fire classification, A1 to the BS EN 13501-1 standard. Thermal benefits come from Wetherby A1 Stone Wool Insulation coated in Wetherby K&A A1 Scrim Adhesive, ensuring strong adhesion with mineral-based components.

Finishing with Wetherby Heck ED Mineral Render and Heck Silicone Paint enhances breathability and offers a range of colors. Commonly used on high-rise buildings for premium fire performance, it is also adaptable to low-rise buildings and non-traditional structures, making it a versatile choice for safety-conscious specifiers.

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Colour Availability

We have a comprehensive range of 100 standard colours that are available for our Silicone Paint, used to overcoat Mineral Render. With a variety of vibrant and durable options, our silicone renders are designed to enhance the aesthetic appeal and longevity of your projects. Discover our extensive colour range by downloading our brochure below.

0500N

1000N

1050R90B

3040B50G

2050Y90R

1030Y20R

Colour Card

Download Thin Coat Render Colour Selection

Download

Wetherby A1 Stone Wool Mineral Render System Components

Benefits of our A1 Stone Wool Mineral Render System

The A1 Stone Wool Mineral Render System is a revolutionary solution, designed to elevate your projects. This advanced insulation system provides many benefits going beyond traditional methods, offering unmatched performance, sustainability, and cost-effectiveness.

Suitable for high-rise buildings – No height restrictions

Available in a Variety of Colours

Breathable

A1 Fire Rating

Reduced Drying Time

A1 Systems Brochure

Download Our SA1 Systems Brochure

Download

Technical Information

Specifying an External Wall Insulation system that is suitable for your project can be a challenging practice. Our technical team are on hand to provide detailed job specific specifications and any technical assistance you may require.

Fire Classification
Design Life
Impact Resistance
Hygrothermal / Freeze / Thaw Testing
Sheathing Board
Stone Wool Thermal Values Conductivity
Lambda value
Thicknesses Available
Finish Options

A1 to EN 13501-1
30 years
Category II
Pass
Fibre Cement Board (BS EN 12467)
CPB (BS EN 12467 / BS EN 634-2)
Ply (BS EN 313-1)
OSB (BS EN 300)
0.036 W/(m²k)
50mm+ = 0.036
30-40mm = 0.038
30mm – 250mm
Mineral Render with Silicone Paint, available in a wide range of colours

The information contained within this website is intended for general guidance only. To obtain the most accurate and up-to-date design solutions tailored to your specific needs, please contact the Wetherby team directly.

Typical U-Values

Wetherby Stone Wool insulation offers a 0.036 W/(mK) K value, requiring just 100mm thickness to meet UK refurbishment property U-value standards in the majority of cases.

Technical Data

*Some new build insurers such as NHBC, Premier Guarantee and LABC insist on a drainage cavity on new build housing projects. Therefore a Wetherby cavity rail system would be the best solution. Please see the links below to view suitable Wetherby cavity rail systems.

Product Information

At the core of our Stone Wool Silicone Render system lies Rockwool insulation, providing outstanding thermal performance, unparalleled breathability and superior acoustic properties in comparison with other insulants on the market. Stone Wool is classified as A1 non-combustible as an individual product.

Outstanding thermal and acoustic properties
Non combustible
Easily cut and shaped
Can be installed to flat & curved surfaces
Open cell structure allows the façade to breath

Wetherby Mineral Render tackles is an ideal product to apply in adverse weather conditions. Its chemical reaction enables drying in damp and high humidity, independent of atmospheric conditions. The standard off-white finish can be transformed with the application of silicone paint as a final top coat, which is included within the fire classification.

Dry’s independently of humidity
Highly breathable
High water-resistance
Easy application
Wide colour range available using WBS Silicone FF paint

Case Studies

Discover real-world examples where challenges were met with innovative solutions, and obstacles transformed into opportunities.

Kingsway House, Warrington

Gala House, Nottingham

Bath Court, Birmingham

Mountford House

Related EWI Systems

We have developed a range of EWI systems ideal for use with various construction methods, view the other systems.

Contact the Team at Wetherby Wall Systems

We understand that embarking on a construction project is a significant endeavor, and we’re here to support you every step of the way.

If you have any inquiries, require additional information, or would like to discuss your specific project needs, please don’t hesitate to reach out. Our dedicated team of experts is ready to listen, collaborate, and provide tailored solutions.

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A1 Direct Fix Steel Frame Stone Wool Mineral Render System