Sandstone care in North Curl Curl

North Curl Curl is bounded by Curl Curl Lagoon and Greendale Creek to the south, Harbord Road to the west and Headland Road to the north, with the Tasman Sea on its eastern edge. The suburb is largely the southern face of Wingala Hill, so streets climb steadily from the playing fields and community garden north of the lagoon toward the headland. North Curl Curl Beach lies under the cliffs of Dee Why Head, and its 25-metre rockpool near the end of the headland can only be reached by the coastal walk at high tide. Homes are mostly houses on sloping blocks, and sandstone shows up in retaining walls, terraced gardens, stairs and paving.

Two exposures meet on Wingala Hill. Homes on the upper, east-facing streets catch onshore wind carrying fine salt off the ocean, which settles on terraces and pool areas and works into the stone through dew. Over time this shows as a sandy surface and white bloom on walls that face the sea. Lower down, near the lagoon and playing fields, the air is damper and the stone dries more slowly, so algae and mould spread on shaded paths and walls. The slope means water runs through retaining walls after rain, carrying salts and iron that can stain the face. Lichen colonises wall caps across the hill, and most gardens show a little of everything.

No heritage conservation area for North Curl Curl appeared in our research. That does not rule out individual listings, so before any restoration beyond routine cleaning, see whether your lot appears in the heritage schedule of the Warringah LEP 2011, which covers this former Warringah area, or ask Northern Beaches Council. Clause 5.10 is what triggers consent for work on heritage items. For units and townhouses, shared driveways, stairs and walls normally sit with the owners corporation. The lagoon and beach are downhill from almost every property, and polluting waters is an offence under NSW environment law, so all wash water is recovered rather than let into the street.

We estimate 35 to 45 minutes off-peak between Double Bay and North Curl Curl, over the Spit Bridge and then along Harbord Road or Pittwater Road. Steep driveways are common on the hill, so we confirm where the van can sit and how far equipment needs to be carried. Our technicians work from the highest level down, setting containment at each step of the garden so water cannot run onto the next terrace or the street. On ocean-facing terraces we watch the forecast and schedule sealing for a still, dry day, because an onshore breeze leaves salt on freshly treated stone. Shaded lower walls may need an extra drying day before sealing.