Funcosil SNL is a high-performance, silane-based water repellent specially formulated for historic and mineral building materials. It provides long-lasting, invisible protection against driving rain and moisture ingress while fully preserving the breathability of the substrate. Ideal for the conservation of natural stone, brick, render, and lime-based mortars, Funcosil SNL is BBA-approved and widely trusted in heritage and eco-renovation projects.
Key Features
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Deep Penetrating Silane Formulation – Bonds chemically with the substrate for long-term effectiveness
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100% Vapour Open – Allows trapped moisture to escape while blocking liquid water
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Invisible Finish – No sheen or surface film, maintaining the natural appearance of the material
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Reduces Efflorescence & Algae Growth – By preventing moisture penetration, it limits conditions for salts and biological growth
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Ideal for Breathable Walls – Complements lime renders, stonework, and mineral paints without sealing the surface
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BBA Certified – Independently tested and approved for long-term use on masonry surfaces
🏛️ Suitable Substrates
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Lime render
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Lime pointing and lime mortars
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Natural stone (limestone, sandstone, granite, etc.)
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Mineral renders and porous brickwork
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Previously silicate-painted façades
Funcosil SNL is especially well-suited for older buildings, heritage sites, and eco-renovation projects where maintaining breathability is critical.
Application Guidelines
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Apply to clean, dry substrates using a brush, roller, or low-pressure sprayer
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Ensure full saturation for maximum penetration – a "wet-on-wet" method is recommended
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Do not apply in rainy conditions or below +5°C
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Typical consumption: 0.5 L/m² depending on porosity
Always conduct a test area to assess absorption and visual impact prior to full application.
Funcosil SNL – Frequently Asked Questions
Is Funcosil SNL compatible with lime-based materials?
Yes. It is specifically designed for use with lime render, lime pointing, and natural stone – making it ideal for heritage and breathable construction.
Will it affect the appearance of the building?
No. Funcosil SNL leaves no visible film or sheen and maintains the natural look of the material.
How long does the protection last?
Typically 10+ years depending on exposure and substrate condition.
