Opis
Atlas Silicone-Silicate Render 25kg – Hydrophobic & Breathable Finish
Product Overview
Professional-grade atlas silicone-silicate render 25kg UK is an advanced hybrid thin-coat finish that combines the best properties of organic siloxane resins and inorganic silicate binders. Engineered for facades where maximum vapour permeability is non-negotiable, this hydrophobic crack resistant render UK provides a high-performance "breathable" shield for building envelopes. It is the ideal specification for cellular concrete (AAC) substrates, historical renovations, and high-humidity environments like kitchens or swimming pool enclosures. Reinforced with dispersed microfibers, it creates an elastic, durable layer that effectively compensates for thermal stress while maintaining the self-cleaning advantages of a pure silicone system.
Key Benefits
- Extreme Vapour Permeability: Classified as V1 (High), allowing moisture to escape freely from the building fabric.
- Dual-Binder Strength: Hybrid technology ensures superior bonding to mineral substrates and high mechanical resistance.
- Microfiber Reinforcement: Integrated fibres act as a structural skeleton to prevent hairline cracks and surface chipping.
- Low Water Absorption: W3-class hydrophobicity protects the insulation layer from driving rain and moisture ingress.
- Algae & Fungi Protection: Specific acid-alkaline reaction prevents biological growth, keeping the facade clean in damp UK conditions.
- UV Stable Colours: Advanced pigments and automated dosing guarantee long-term colour vibrancy without fading.
Technical Specifications
| Property | Value |
|---|---|
| Base Material | Organic/Inorganic Hybrid (Siloxane & Silicate) |
| Density | Approx. 1.7 kg/dm³ |
| Grain Size | 1.5 mm / 2.0 mm (Spotted Texture) |
| Vapour Permeability | V1 (High) per EN 15824 |
| Water Absorption | W3 (Low) per EN 15824 |
| Adhesion to Substrate | Min. 0.35 MPa |
| Coverage | Up to 10 m² per 25kg tub (~2.5 kg/m²) |
| Standard Compliance | EN 15824:2017 / BBA Certified System Component |
Application & Compatibility
- Primary Substrates: Best suited for cellular concrete (Aerated Concrete), standard masonry, and mineral basecoats.
- System Integration: Part of a certified EWI system when used over graphite EPS or mineral wool boards.
- Mandatory Priming: Must be applied over a cured layer of Atlas Cerplast quartz primer to ensure chemical bonding.
- Use-Case: Perfect for renovation projects where old masonry requires high breathability to prevent internal damp.
Installation Notes
Substrates must be structural sound, clean, and primed 24 hours before application to regulate suction. Mix the material using a low-speed mechanical stirrer to achieve a uniform consistency. To avoid visible join lines, always work in a "wet-on-wet" manner across entire elevations. For applications during winter or in high humidity, we recommend adding a setting accelerator to ensure rapid early rain resistance. Do not apply in direct intense sunlight or high winds, as this may cause premature drying and surface cracking.
Is This Product Right for Your Project?
- Choose this product if: You are rendering over aerated concrete blocks or renovating an older property that requires maximum breathability and crack resistance.
- Consider alternatives if: You are working on a standard masonry project with a limited budget; in such cases, our pure silicone render variants may provide a more cost-effective finish.
Frequently Asked Questions
Can this render be applied by machine?
Yes. The 1.5mm grain version is specifically optimized for professional machine application, which significantly speeds up the rendering process on large elevations.
Does it need painting?
No. This is a through-coloured render. The pigment is integrated throughout the material, meaning it will never peel, flake, or require repainting like traditional masonry paint.
Is it suitable for timber-frame buildings?
Yes, provided it is applied over a suitable render carrier board and a reinforced basecoat layer with mesh.
For more technical data and professional tools, browse our full rendering supplies menu. Access the full Technical Data Sheet for detailed mixing ratios and site safety information.