Chalk

This sieved chalk is a high-purity calcium carbonate aggregate, specifically processed for the demanding requirements of heritage conservation and traditional lime-based masonry.

Unlike standard sharp sands, our sieved chalk offers a softer, more porous alternative that mimics the historic "chalk-lime" mortars found in regional vernacular architecture. It is the ideal choice for creating authentic, breathable mortars, renders, and plasters that protect the integrity of friable masonry.

• High Purity: Clean, high-calcium chalk ensures chemical compatibility with both NHL (Natural Hydraulic Lime) and traditional lime putties.
• Enhanced Breathability: The natural porosity of the chalk particles improves moisture movement within the mortar joint, reducing the risk of freeze-thaw damage to historic brick or flint.
• Authentic Aesthetic: Provides the characteristic "creamy" or "off-white" flecked appearance synonymous with traditional regional finishes.
• Precision Graded: Sieved to ensure consistent performance and workable "fatty" textures.