How to Maintain & Clean Sandstone Pavers

How to Maintain and Clean Sandstone: A Practical Guide

Natural sandstone is a durable, long-lasting material that graces some of Australia's oldest buildings. With proper care, your sandstone pavers, tiles, walls and features will look beautiful for decades — even improving with age. This guide covers everything you need to know about sealing, cleaning, stain removal and yearly maintenance for sandstone in Sydney's climate.

Sealing Your Sandstone

Sealing is the single most important step in sandstone maintenance. A quality sealer protects the stone from water penetration, staining and weathering without changing its natural appearance.

When to Seal

• After installation — seal new sandstone once the mortar or bedding has fully cured (typically 28 days). Ensure the stone is completely dry before applying sealer.
• Re-sealing — reseal every 2 to 5 years, depending on the sealer used and the level of exposure. High-traffic areas and pool surrounds may need more frequent resealing.

Types of Sealer

• Impregnating sealers (penetrating) — these soak into the stone and protect from within, without changing the stone's appearance or creating a surface film. This is the most popular choice for outdoor sandstone pavers and outdoor tiles.
• Enhancing sealers — these penetrate the stone and slightly deepen the colour, bringing out the natural grain and warmth. Ideal if you want to enrich the stone's appearance.
• Topical sealers — these create a surface coating. While they offer strong protection, they can peel, become slippery when wet and trap moisture. Generally not recommended for outdoor sandstone.

How to Apply Sealer

• Clean the stone thoroughly and allow it to dry completely (at least 24 to 48 hours of dry weather).
• Apply sealer with a paint roller, brush or low-pressure sprayer, following the manufacturer's directions.
• Apply two coats, allowing the first coat to dry before applying the second.
• Avoid sealing in direct sunlight or extreme heat, as this can cause the sealer to dry too quickly and not penetrate properly.
• Allow the sealer to cure fully before exposing the area to foot traffic or water.

Regular Cleaning

Routine cleaning keeps your sandstone looking its best and prevents the build-up of dirt, moss and organic matter that can cause staining if left unchecked.

Weekly / Fortnightly

• Sweep or blow — remove leaves, debris and loose dirt regularly. This is especially important in autumn when leaf litter can stain light-coloured stone.
• Rinse — a quick hose-down removes surface dust and keeps the stone fresh.

Monthly / Quarterly

• Mop or scrub — use warm water and a pH-neutral stone cleaner. Avoid acidic cleaners (vinegar, citrus-based products) and strongly alkaline cleaners, as these can damage the stone surface.
• Check for moss and algae — in shaded, damp areas, moss and algae can develop. Address this early with a gentle stone-safe algae remover before it becomes established.

What NOT to Use on Sandstone

• Pressure washers at high settings — high-pressure water can erode the stone surface. If you must use a pressure washer, use a wide fan nozzle at low pressure (no more than 1,500 PSI) and keep the nozzle at least 300mm from the surface.
• Acid-based cleaners — hydrochloric acid, muriatic acid and acidic bathroom cleaners will etch and damage sandstone.
• Wire brushes — these scratch and damage the stone surface. Use a soft-bristled brush instead.
• Bleach — household bleach can discolour sandstone and damage sealers. Use stone-specific cleaners instead.

Stain Removal Guide

Despite sealing, stains can sometimes occur. Here is how to deal with common stains on sandstone:

Organic Stains (Leaves, Berries, Food)

These often appear as brown or dark patches. Apply a poultice of baking soda mixed with water (or hydrogen peroxide for stubborn stains) to the affected area, cover with plastic wrap and leave for 24 hours. The poultice draws the stain out of the stone. Rinse and repeat if necessary.

Oil and Grease Stains

Common around barbecue areas. Blot excess oil immediately (do not rub). Apply an absorbent material like cornflour or talcum powder and leave overnight. For set-in oil stains, use a commercial stone oil stain remover or a poultice of baking soda and acetone.

Rust Stains

Caused by metal furniture, tools or fixtures left on the stone. Use a commercial rust remover specifically designed for natural stone. Never use general-purpose rust removers, as they often contain acids that damage sandstone.

Efflorescence (White Salt Deposits)

White, powdery deposits can appear on new sandstone as salts migrate to the surface during the drying process. This is natural and typically resolves on its own within the first year. Brush off dry deposits with a stiff broom. Persistent efflorescence may indicate a moisture issue beneath the stone.

Yearly Maintenance Checklist

Once a year — ideally in spring — carry out a thorough maintenance inspection:

• Inspect joints — check mortar joints or sand-filled joints for erosion or cracking. Re-point or re-sand as needed.
• Check sealer — sprinkle water on the stone surface. If water beads up, the sealer is still effective. If water soaks in, it is time to reseal.
• Deep clean — give the entire surface a thorough clean with a stone-specific cleaner.
• Inspect drainage — ensure water drains away from the stone surface properly. Pooling water can cause staining and moss growth.
• Trim vegetation — keep garden beds, tree roots and climbing plants away from sandstone surfaces. Root pressure can lift pavers, and foliage creates damp, shaded conditions that encourage moss.
• Check for damage — look for cracked, chipped or loose pavers and repair or replace them promptly.

Maintaining Sandstone Walls and Blocks

Sandstone block walls and cladding require less maintenance than horizontal paving surfaces, as they are not subject to foot traffic or pooling water. However, they still benefit from:

• Gentle washing every year or two to remove dust and cobwebs
• Checking mortar joints for deterioration
• Removing any plant growth (ivy, moss) that can trap moisture against the stone
• Sealing if the wall is in an exposed location

Need Help?

If you have questions about maintaining your sandstone, contact Stone Front on . We can recommend appropriate sealers and cleaning products for your specific stone and application. Browse our complete guide to sandstone pavers or sandstone flooring guide for more detailed product information.