Otterbein NHL 3.5 is a high-purity Natural Hydraulic Lime manufactured from a carefully selected single-source limestone deposit in Germany. With a balanced binder strength and excellent vapour permeability, it is ideal for a wide range of applications including lime rendering, pointing, bedding, and general masonry work—particularly in solid wall construction and heritage buildings.
Free from cement and synthetic additives, Otterbein NHL 3.5 provides a stronger set than NHL 2, while maintaining the flexibility and breathability essential in conservation and eco-friendly building projects.
Key Benefits
✅ Optimal Strength & Flexibility – Stronger than NHL 2, but still gentle enough for use in traditional and solid wall buildings.
✅ Highly Vapour Permeable – Allows walls to "breathe", reducing the risk of trapped moisture and internal damp.
✅ Durable & Weather Resistant – Suitable for external renders, exposed pointing, and moderately exposed locations.
✅ Excellent Workability – Smooth, cohesive mix ideal for trowel or hand application on-site.
✅ Pure Natural Lime – No cement, additives, or blending—ensuring reliable performance and compatibility with traditional materials.
✅ Consistent German Quality – Manufactured under strict quality controls for conservation-grade reliability.
Applications
🔹 External Lime Renders & Harling – Offers strength and durability while maintaining breathability.
🔹 Pointing & Bedding Mortars – Suitable for stone, brick, or block in both modern and historic construction.
🔹 General Masonry Repair – Ideal for repointing solid walls and repairing traditional mortars.
🔹 Scratch & Float Coats – Used as base coats in breathable lime plaster systems before applying fine finish coats.
