Cast stone products are valued for their beauty and resilience, enhancing both buildings and landscapes. However, like any building material, cast stone products require proper care to maintain their appearance and longevity. Read our guide to learn more about effective care for cast stone and how to keep it looking pristine.
Principles of Cast Stone Care
Before exploring specific cleaning methods, it’s essential to understand a few guiding principles for architectural cast stone care. Cast stone behaves similarly to natural stone, meaning cleaning can sometimes reveal minor colour variations from weathering. These changes are usually subtle and can be managed with gentle cleaning.
Another key consideration is that dirt build-up on cast stone products is generally harmless unless it causes decay or stains. If you notice underlying deterioration, consult a professional. As with any cleaning, test your method on a small, hidden area before moving to visible sections.
Dry Brushing
Dry brushing is often the first step in cast stone maintenance. Use a stiff bristle or fibreglass brush to remove light deposits like dust. Avoid metallic brushes, which can damage the surface of architectural cast stone. This simple method preserves the original texture and colour of the stone without causing wear.
Water Washing
Water washing is an effective way to clean cast stone products, as most surface dirt is water soluble. All you need is a bucket, a brush, and a low-pressure hosepipe. Avoid high-pressure hoses, which can damage the stone surface or mortar joints. For tougher stains, add a mild detergent like sugar soap to the water, and rinse thoroughly afterwards. Be cautious not to saturate the cast stone, as excessive water can cause staining or efflorescence, where salts reappear as white spots.
Using Chemical Cleaners
Chemical cleaning can tackle more persistent stains, such as salt deposits on architectural cast stone. Diluted hydrochloric acid or proprietary cleaners are effective but follow manufacturer instructions closely. Chemical cleaners can sometimes alter the stone’s colour or texture, so treat entire areas for a uniform appearance. Always pre-wet the surface of cast stone products with water before applying any acid-based cleaners to prevent the stone from absorbing too many chemicals, which could cause damage.
Preparing and Finishing Cast Stone Cleaning
Before cleaning, remove any moss or dirt build-up on precast stone with a soft brush. Protect nearby areas with plastic sheeting, and lightly spray the cast stone with water to prevent over-saturation. After cleaning, let the cast stone dry and check the results. If needed, repeat the process until you achieve the desired look. Rinse thoroughly with water, and absorb any excess moisture to prevent staining.
At Shropshire Brick & Stone Ltd, we’re architectural cast stone suppliers and installers, who craft a wide range of precast stone products, including window cills and porticos, tailored to your construction needs. For more information or to discuss your next project, contact our team today!
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