Sandstone cleaning and sealing in North Narrabeen

A typical North Narrabeen garden holds more sandstone than it first appears. There are retaining walls holding up the front lawn, a run of steps from the street, a paved area by the back door and often a low wall or edging along the boundary. On the beach-facing parts the stone turns pale and gritty, and grains come away when you run a hand across it. On shady parts, especially near the lagoon, it goes dark with algae and mould and becomes slippery on wet mornings. Our technicians map these areas on the first visit and run small trials, so the treatment for each face is settled before the main clean begins.

Salt-affected stone is handled gently because its surface is already weakened. We brush away loose salt and sand while the stone is dry, then use fresh water and a mild cleaner to dissolve what remains, rinsing at low pressure. Where growth is the issue, a biocide is applied and given time, and the dead growth is then worked loose with soft brushes before a gentle rinse. Old patches of cement render or paint on walls are noted and discussed rather than stripped in the same visit, because removing them can call for a restoration approach. Throughout the job, wash water is caught at the base of each wall or stair and taken away.

Not every surface in a North Narrabeen garden should be sealed. Paving and steps that take foot traffic and salty air usually do better with a breathable penetrating sealer, which slows the entry of salt and grime while letting moisture out. Retaining walls, with damp soil behind them, are normally left unsealed so water can evaporate through the face. Low-lying paths that stay wet much of the year may also be poor candidates, since sealer cannot bond to damp stone. We explain these calls on site, show you trial patches in natural and enhancing finishes, and record the product and date for future reference.