Atlas Silicone Render Grey 25kg – Self-Cleaning Facade Finish

Product Overview

Professional-grade grey atlas silicone render is a high-performance thin-coat decorative finish designed for modern External Wall Insulation (EWI) systems and advanced masonry protection. Formulated with premium siloxane resins and reinforced with dispersed microfibers, this grey silicone render provides a flexible, crack-resistant barrier that compensates for the thermal stresses common in the UK climate. Offering exceptional vapour permeability and integrated self-cleaning properties, it is the ideal specification for urban facades and contemporary residential projects requiring a durable, through-coloured finish. This atlas silicone render grey 25kg UK variant is optimized for consistent texture and long-term UV stability, maintaining its sophisticated tone without the need for traditional masonry paint.

Key Benefits

• Nanotechnology Self-Cleaning: Advanced siloxane binders reduce surface tension, allowing rainwater to wash away environmental pollutants and dust.
• Enhanced Elasticity: Microfiber reinforcement ensures the render layer moves with the building, significantly reducing the risk of hairline cracks.
• Superior Bio-Protection: High pH resistance and low water absorption create an environment hostile to algae, fungi, and mould growth.
• UV & Colour Fastness: High-quality grey pigments are integrated throughout the material, preventing fading even on exposed, south-facing elevations.
• Optimal Breathability: Classified as V1 (High) vapour permeability, it allows moisture to escape from the building fabric to prevent internal damp.
• Versatile Application: Optimized for both manual trowel application and professional machine spraying for maximum site productivity.

Technical Specifications

Property	Value
Base Material	Siloxane Resins, Mineral Fillers, Pigments
Grain Size	1.5 mm / 2.0 mm (Spotted Texture)
Coverage	Up to 10 m² per 25kg tub (~2.5 kg/m²)
Density	Approx. 1.7 kg/dm³
Adhesion to Substrate	Min. 0.35 MPa
Vapour Permeability	V1 (High) per EN 15824
Water Absorption	W3 (Low) per EN 15824
Standard Compliance	EN 15824:2017 / BBA Certified Systems

Application & Compatibility

• Substrates: Suitable for application over reinforced basecoats on Graphite EPS, Mineral Wool, and XPS insulation boards.
• Surface Preparation: Substrates must be structural sound, clean, and dry. Application must follow a cured layer of quartz primer.
• Mandatory Priming: For guaranteed adhesion and colour depth, use Atlas Cerplast or Ceresit CT16 in a matching shade.
• System Integration: Fully compatible with Atlas and Ceresit EWI system components including fibreglass reinforcement mesh.
• Limitations: Not suitable for application on horizontal surfaces or areas below the Damp Proof Course (DPC) where heavy splashing occurs.

Installation Notes

Substrates must be primed at least 24 hours prior to rendering to regulate suction. The material should be mixed using a low-speed mechanical stirrer to achieve a uniform consistency. To ensure a professional finish without lap marks, elevations must be completed in a single "wet-on-wet" operation, requiring sufficient labour to maintain the edge. Avoid application during direct intense sunlight, high winds, or when rain is expected within the first 24 hours. For winter applications in temperatures between 0°C and +5°C, the use of a professional setting accelerator is mandatory to protect the fresh render.

Is This Product Right for Your Project?

• Choose this product if: You require a contemporary grey aesthetic with high crack resistance and low maintenance for a standard residential or commercial facade.
• Consider alternatives if: You are working on a high-rise building requiring non-combustible A1 mineral-based insulation and render; in such cases, consult our mineral wool collection.

Frequently Asked Questions

Does the grey colour fade over time?

No. This is a through-coloured product, meaning the pigment is mixed throughout the render. It is highly UV-stable and will not peel or flake like traditional exterior paint.

Can I apply this over an old rendered wall?

Yes, provided the existing render is structurally sound, clean, and not "bossed." You must apply a reinforced basecoat layer with mesh before applying the silicone topcoat for a crack-free result.

How many tubs do I need for a standard 3-bedroom semi?

A typical 80m² elevation requires approximately 8 to 9 tubs of 25kg render, assuming a standard 1.5mm grain size. We recommend ordering 5% extra for detailing and site waste.

For professional results, pair this finish with our silicone render primers and ensure your schedule is protected by using Atlas Eskimo accelerator during UK winter months. Browse our full range of premium silicone renders for additional texture options.