Trass is a natural pozzolanic material derived from volcanic deposits, widely used as an additive in lime mortars, renders, and plasters to enhance strength, durability, and moisture resistance. When mixed with lime, Trass undergoes a hydraulic reaction, improving setting characteristics and reducing shrinkage while maintaining high breathability.
Key Benefits:
✅ Enhances Strength & Durability – Increases compressive strength and reduces shrinkage, making lime mortars more robust and long-lasting.
✅ Improves Water Resistance – Reduces capillary water absorption, enhancing resistance to weathering and damp conditions.
✅ Maintains Breathability – Ensures high vapour permeability, making it ideal for historic and conservation projects.
✅ Reduces Efflorescence – Minimizes lime leaching and salt migration, helping to prevent surface staining.
✅ Compatible with Natural Binders – Works effectively with hydrated lime, hot lime, and natural hydraulic lime (NHL).
Applications:
🔹 Traditional Lime Mortars & Renders – Used to modify lime-based mixes for masonry, pointing, and rendering.
🔹 Limecrete Flooring & Screeds – Enhances the performance of limecrete floors by increasing hydraulic properties.
🔹 Heritage & Conservation Projects – Ideal for historic restoration where breathability and compatibility with existing materials are essential.
