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

A2 Steel Frame Stone Wool Silicone Render System

The Wetherby Direct Fix Steel Frame System has been developed to allow the installation of A-rated Wetherby systems to a sheathed steel frame substrate. The direct fix application allows the system to be directly mechanically fixed with adhesive (where required) removing the need for a cavity and the cavity fire-stopping behind the A1 Stone Wool insulation. Suitable for use on a variety of project types such as schools, student accommodation and high-rise reclad projects, the system has proven incredibly popular since its launch in 2022.

Our A2-s1,d0 Stone Wool Silicone Render EWI system delivers durability, energy efficiency, and aesthetics. Engineered for the UK climate, it features Wetherby Silicone Render 4S for seamless integration with stone wool insulation, ensuring breathability and performance. Combining stone wool’s insulation with silicone’s weatherproofing, Wetherby sets a sustainable construction standard.*

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Colour Availability

Our Stone Wool Silicone Render System is available in various colours across Silicone, Acrylic, Four Seasons, and 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

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Approved Finishes

Our Stone Wool Silicone Render System comes in a variety of finishes, below is an example of textures available.

1.0MM K

1.5MM K

2.0MM K

3.0MM K

Wetherby Stone Wool Silicone Render System Components

Benefits of our Stone Wool Silicone Render System

The Stone Wool Silicone 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

Available in a Variety of Textures

Flexible Finish

A2 Fire Rating

Heck 4 Season Application

Thin Coat Systems Brochure

Download Our Thin Coat 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

A2-s1, d0 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
Silicone Render available in a variety of finishes, each with a 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 Four Seasons (4S) Silicone Render confidently tackles the UK climate’s challenges, excelling in lower temperatures. It creates a formidable shield against rain damage, reducing wash-offs significantly. With a myriad of additional benefits, it stands as the premier choice for enduring performance in any weather condition.

Rapid rainproof status
High humidity resistance
Algae and mold prevention
Wide application range
Exceptional water-repellent qualities
Extended application window

Case Studies

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

Apollo Apartments, Bristol

Premier Inn, St Helier

Croxley Danes School

Bath Court, Birmingham

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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A2 Steel Frame Stone Wool Silicone Render System