Stone & Masonry Cleaning

Heritage facades naturally accumulate atmospheric pollution, biological growth, dirt, staining and mineral deposits. Cleaning can substantially improve the appearance of a building, but the method must be carefully matched to the material.

Sandstone, limestone, bluestone and historic brick all respond differently to water, pressure and cleaning agents. Excessive pressure can remove the protective surface of the stone, open its pores and make it more vulnerable to future weathering.

Our masonry cleaning services use controlled, low-pressure and specialist chemical systems designed to remove contaminants without unnecessarily damaging the underlying material.

Depending on the building, cleaning may address:

  • Mould, moss, algae and lichen
  • Atmospheric and traffic-related staining
  • Carbon and pollutant deposits
  • Dirt embedded within porous stone
  • Organic staining
  • Residue remaining after paint removal
  • Localised salt or mineral deposits

Before broader cleaning begins, test areas are used to determine the safest and most effective treatment. The aim is not to make historic masonry look artificially new, but to remove harmful or visually disruptive deposits while retaining the building’s natural patina and material character.

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FAQs

Commonly Asked Questions

Does Authentic Stone undertake small masonry cleaning jobs?

Authentic Stone specialises in full-facade and large-scale heritage stone and masonry cleaning rather than small patches or isolated sections. Cleaning only part of a facade can produce visible differences in colour and finish while leaving surrounding staining or deterioration untreated. Our projects are generally undertaken as part of a complete restoration program and may include stone cleaning, paint stripping, heritage repointing and chimney works where required. Property owners seeking minor cleaning work may contact us for a referral to a suitable tradesperson.

Will cleaning make heritage stone look new again?

The purpose of heritage masonry cleaning is not to make an old building look artificially new. A well-considered cleaning process removes harmful or visually disruptive deposits while retaining the natural variations, weathering and patina that contribute to the building’s character. Some staining, historic repairs and colour differences may remain after cleaning, particularly where they have become part of the masonry surface. Test areas help establish a realistic result before the full facade is treated.

What types of staining can be removed from heritage masonry?

Professional masonry cleaning can address many common forms of staining, including mould, algae, moss, lichen, atmospheric pollution, traffic residue, organic marks and some mineral deposits. The success of the treatment depends on the cause of the stain, how deeply it has penetrated and the condition of the stone or brick beneath it. Salt deposits, persistent damp staining and discolouration caused by previous repairs may require further investigation, as cleaning the surface alone will not resolve an ongoing moisture or drainage problem.

Is pressure washing safe for heritage sandstone and brickwork?

High-pressure washing is generally not suitable for soft or deteriorated heritage masonry because it can erode the stone surface, damage brick faces and remove weakened mortar from the joints. Excessive pressure may also drive water deeper into porous walls, potentially contributing to dampness and salt movement. Heritage masonry should instead be cleaned using carefully controlled low-pressure water, specialist chemical treatments and manual techniques selected for the material and type of staining. Test areas are normally completed before broader cleaning begins.

What is heritage stone and masonry cleaning?

Heritage stone and masonry cleaning is the careful removal of dirt, biological growth, atmospheric staining, pollutants and surface deposits from older stone, brick and mortar. Unlike standard exterior cleaning, heritage masonry cleaning must account for the porosity, hardness and condition of the original materials. Authentic Stone uses controlled cleaning methods suited to sandstone, bluestone, limestone and heritage brickwork, with the aim of improving the facade’s appearance without removing historic texture, damaging mortar joints or accelerating future deterioration.