Client's case

E Hitchcock – Godalming

Mrs Hitchcock’s 13 year old Indian Sandstone Patio and linked pathways had lost all their original colour. On inspection, the area was covered in black spots, which had become an infestation. When joined by the white spots (white fungi), and a layer of green algae, the result was a dull, lifeless, patio, which became a “death trap” when wet.

Although pressure washing removed some of the dirt, it did not touch the black spots, merely accentuating their appearance. Relying on pressure only, will damage the stone. Sandstone is sedimentary; it cures in layers and splits in layers – pressure washing vibrates the surface, delaminating the layers. Similarly, acid should not be allowed anywhere near the surface of Sandstone, as it will permanently damage the surface.

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