Limestone - Stone Care Guide

Limestone Stone Care Guide

Properties, maintenance, and expert advice for limestone surfaces

Hardness3/10 Mohs
PorosityHigh
Acid SensitiveYes - avoid acid products
Frost ResistantNo - seal for outdoor use
Slip Risk (wet)Medium

About Limestone

Limestone is a sedimentary rock formed over millions of years from the accumulation of marine organisms - shells, coral, and skeletal fragments - on ancient sea floors. Composed primarily of calcite (calcium carbonate), it has a warm, natural appearance that ranges from creamy whites and pale yellows to deep greys and even blues.

As a calcareous and relatively porous stone, limestone requires careful handling. Like marble, it is highly sensitive to acids - even diluted cleaning products containing citric acid or hydrochloric acid can cause irreversible etching. Its high porosity means it absorbs liquids quickly, so spills need immediate cleanup and protective sealing is a must.

Limestone has been used in architecture for millennia, from the Egyptian pyramids to European cathedrals. Today it is valued for its soft, natural aesthetic in both interior and exterior applications. In outdoor settings, it weathers gracefully but requires regular sealing and protection from biological growth.

Characteristics

  • Sedimentary rock (calcium carbonate)
  • Calcareous - highly acid-sensitive
  • High porosity
  • Warm, natural tones
  • Contains fossil impressions

Common Uses

  • Interior flooring
  • Wall cladding
  • Bathroom surfaces
  • Garden terraces
  • Windowsills
  • Fireplace surrounds

Popular Varieties

  • Jura Limestone (Germany, beige-grey)
  • Portland Stone (England, cream)
  • Solnhofen (Germany, fine-grained)
  • Burgundy Stone (France, warm tones)
  • Belgian Limestone (blue-grey)
  • Comblanchien (France, compact)

Care Essentials

  • Never use any acidic products - even mild acids cause permanent damage
  • Seal thoroughly after installation - essential due to high porosity
  • Apply two coats of impregnator on very porous varieties
  • Clean spills immediately to prevent staining
  • Use only pH-neutral maintenance cleaners

Common Problems

  • Acid etching (extremely common in kitchens)
  • Deep staining from absorbed liquids
  • Efflorescence on outdoor installations
  • Algae and moss growth outdoors
  • Frost damage if not properly sealed

Recommended Products for Limestone

Need personalised advice?

Use our Lithofinder to find the right product for your specific limestone problem, or chat with our stone care expert.