Steel Frame Cavity Rail Stone Wool Silicone Render

Steel Frame Cavity Rail Stone Wool Silicone Render System

The Wetherby Stone Wool Silicone Render Cavity Rail system is an ideal solution for steel frame substrates requiring a drainage cavity between the sheathed steel frame and insulation.

The cavity is ‘partially ventilated’ meaning the effect on the through wall U-value is minimal, with small drainage holes in the base track allowing any moisture to escape from the system. New build insurers such as the NHBC, Premier Guarantee and LABC insist on a cavity on new build projects, making the Wetherby Cavity Rail system an ideal solution.

The unique Wetherby RagRail helps to simplify the installation of this
system and combined with the Stone Wool and Silicone Render system, achieves an A2-s1,d0 fire rating to BS EN 13501-1, allowing installations to a building of any height. The Wetherby Silicone Render is available in a wide range of colours, making it an ideal choice for designers seeking a high impact and durable finish.

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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.

Colour Card

Download Thin Coat Render Colour Selection

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Wetherby Steel Frame Cavity Rail Stone Wool Silicone Render System Components

Benefits of our Steel Frame Cavity Rail Stone Wool Silicone Render System

The Steel Frame Cavity Rail 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

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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	A2-s1, d0 to EN 13501-1
Design Life	30 years 60 year option
Impact Resistance	Category I
Hygrothermal / Freeze / Thaw Testing	Pass
Sheathing Board	Fibre Cement Board (BS EN 12467) CPB (BS EN 12467 / BS EN 634-2) Ply (BS EN 313-1) OSB (BS EN 313-1)
Cavity Options	WBS RagRail – Metal Cavity Spacer Rail Timber Batten – Low Rise Only
Stone Wool Thermal Values Conductivity	0.036 W/(m²k)
Thicknesses Available	60mm – 250mm
Finish Options	Silicone Render available in a wide 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.

Technical Data

Technical Drawing Set

Our technical drawings are currently being updated. To request the latest version contact; Technical Helpline 0800 1073299 or technical@wbs-ltd.co.uk

Operations & Maintenance Manual

Our O&M manuals are currently being updated. To request the latest version contact; Technical Helpline 0800 1073299 or technical@wbs-ltd.co.uk

BBA Certification 09-4625 PS5

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Specification with NBS

NBS Source

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.

Huddersfield Road, Galashiels

The Links, Porthcawl

Holywell Extra Care Home

City Heights Student Accommodation

Aberystwyth Football Club

Related EWI Systems

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

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Stone Wool Silicone Render System for a Timber Frame Substrate

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Stone Wool Brick Slip System for a Timber Frame Substrate

Contact the Team at Wetherby Building 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.