First, we want our customers to know the differences between soft washing and power washing. Both are techniques for washing houses, and both may use the same pressure washing equipment. The general consensus is that soft washing will use water pressurized at anything up to 500 psi. In power washing, it can be pressurized at anywhere from 1,000 to 3,000 psi.
As a basis for comparison, water pressure in the average home plumbing system is between 45 psi and 60 psi. Between 1,300 and 1,600 psi, water can strip the finish from a deck or degrease heavy-duty equipment. At such high pressures, water can obviously do damage to a property; it can chip paint, remove strips out of wood and damage the mortar between bricks. It will also degrade concrete patios and driveways, causing numerous small holes, or “pits,” to appear across the surface.