Sandstone cleaning and sealing in Bayview

A Bayview waterfront property can contain most kinds of sandstone work in one block. At the bottom there is often a sea wall and a set of landing steps, then a lawn or terrace, then retaining walls and stairs climbing to the house, and sometimes more terraces above. The lower stonework shows a tide line with weed and a crust of salt, the middle sections grow algae where sprinklers and shade keep them wet, and the upper levels collect leaves and tannin. Our technicians record each of these zones, trial a suitable cleaner in each, and give you a scope that sets out what will be cleaned, what will be sealed and what is best left alone.

On the sea wall and steps, we brush away loose weed and salt first, then use cleaners that suit stone near water and rinse with fresh water at low pressure. Products are not used on surfaces that sit below the normal high-tide line. Higher up, mould and algae are sprayed and then left alone for a while, so the treatment reaches the roots, before gentle brushing and a soft rinse. Tannin shadows get a targeted treatment or a poultice. Each level gets its own bund, and a wet vacuum lifts the water off before gravity can take it to the next terrace or into Pittwater. If we see cracked or undermined blocks, we stop and tell you, since that is structural.

Sealing decisions in Bayview depend on height above the water. Around the house and pool, terraces and steps are worth sealing with a breathable impregnator, which resists salt and makes leaf stains easier to remove. Sea walls and the lowest, splash-prone courses are generally not sealed, because constant wetting from behind and below means a sealer would trap moisture and fail. Retaining walls holding soil are also left to breathe. We let the stone dry fully before sealing, which on the humid western side of the peninsula may take longer than expected, and we record the products and areas treated so maintenance can be planned.