Why Pressure Washing Can Ruin Sandstone
Sandstone looks tough, but a standard pressure washer set-up can strip its surface and speed up erosion. Here's why a gentler method matters.
Sandstone is made of compacted sand grains held together by a natural binder. A pressure washer on too high a setting, held too close, or fitted with the wrong nozzle can blast that binder away, leaving the surface rougher, more porous, and more prone to staining than before.
Over time this shows up as a pitted, sandy-textured surface, faded colour, or grout lines and joints that erode faster than the stone around them.
A soft-wash approach — lower pressure, a wider fan, and the right dwell time for the cleaning solution to lift dirt and organic growth on its own — gets the same clean result without stripping the stone.
If your sandstone is already showing signs of surface erosion, resealing after cleaning helps slow further wear and gives the colour some of its depth back.
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