Sandstone care in Beacon Hill

Beacon Hill takes its name from a trigonometric beacon built by the Department of Lands in 1881. At the summit, about 150 metres above sea level, Governor Phillip Lookout off Warringah Road looks across eastern Sydney, west to the Blue Mountains and north to the Central Coast. Red Hill, at the northern end of the suburb, overlooks the eastern parts of Garigal National Park. Most houses were built in the 1950s and 1960s, and many streets, such as Kokoda Crescent and Goroka Place, are named after places where Australian troops served. Sandstone appears as front and retaining walls, garden steps, paths and paving, rock gardens and pool surrounds.

Height and bush shape Beacon Hill's stone problems. On the upper slopes, wind dries stone quickly but also deposits dust and grit, and lichen thrives on exposed wall caps and outcrops. Toward Red Hill and Garigal, gardens back onto bush that drops leaves and bark, leaving tannin stains on paving and pool coping. South-facing walls and side paths can stay in shade most of the day, letting mould and moss establish. Many homes from the 1950s and 1960s have sandstone that has been cleaned before, sometimes with pressure washers or acid, and that stone often shows furrowed surfaces or orange staining that complicates the next clean.

Our research turned up no conservation area for Beacon Hill, though Aboriginal rock carvings are recorded north of Red Hill. Before restoring older stone, find out from council or the Warringah LEP 2011 whether your lot is a listed item. If natural rock on your property carries engravings, we leave it untouched. Most Beacon Hill homes are freestanding, so strata rules rarely apply, but townhouse complexes do have shared paths and walls that need approval from the owners corporation. Wherever we work, wash water is recovered rather than sent to stormwater, which carries it untreated to creeks and waterways. Machines run only during the hours the NSW noise rules allow.

From Double Bay to Beacon Hill is about 35 to 45 minutes off-peak, on our estimate, crossing the Spit and then taking Warringah Road. Frontages on Warringah Road need care with parking and footpath safety, so we arrive early and set barriers. On residential streets access is usually simple. Our technicians start by checking for signs of earlier harsh cleaning, since stone that has been pressure-washed or acid-washed needs gentler treatment and a careful trial. Leaf litter is cleared before cleaning, plants are protected, and run-off is contained and recovered. On windy hilltop days we postpone sealing, because gusts dry the product unevenly and blow dust onto the wet surface.