NHL (Natural Hydraulic Lime)

Unlike hydrated lime, NHL sets through a hydraulic reaction with water, while also continuing to carbonate with exposure to air. This allows it to develop strength while retaining the flexibility and breathability that lime-based construction is valued for.

NHL is particularly useful where the building needs to manage moisture naturally. Lime mortar allows moisture to move through the joints and evaporate, helping to protect traditional brick and stonework.

Common uses include:

• Traditional brick and stone masonry
• Repointing and mortar work
• Rendering and plastering
• Restoration and conservation work
• Older and historic buildings
• Internal and external applications

Why choose NHL?

• Breathable – helps moisture escape through the masonry
• Flexible – accommodates natural movement in traditional buildings
• Durable – develops strength over time
• Traditional – suitable for conservation and restoration work
• Versatile – available in different strengths for different applications

NHL is available in different grades, such as NHL 2, NHL 3.5 and NHL 5. The correct grade depends on the type of masonry, exposure and application, so choosing the appropriate lime is important.