What is PSI (pounds per square inch)?

PSI stands for pounds per square inch and measures the force of water pressure exerted by a pressure washing machine. In Myrtle Beach, where salt spray and moisture create heavy buildup on homes and commercial properties, understanding PSI matters because it determines whether a pressure washer will clean surfaces effectively without causing damage.

Residential pressure washers typically operate between 1,500 and 3,000 PSI. This range works well for cleaning vinyl siding, wood decks, driveways, and patios where the material is vulnerable to etching, splintering, or gouging if hit with excessive force. Pushing too much pressure into softer materials can strip paint, crack stucco, or strip away wood grain permanently.

Commercial and industrial equipment runs 3,000 PSI and higher, sometimes exceeding 4,200 PSI. This pressure suits concrete surfaces, commercial storefronts, fleet equipment, and heavily soiled industrial sites that demand more aggressive cleaning power.

The nozzle tip, spray pattern, and distance from the surface all work together with PSI to determine actual cleaning impact. A pressure washer at 2,000 PSI held close to wood creates different results than the same machine kept at distance. For Myrtle Beach properties, selecting the right PSI level prevents costly repairs from pressure damage while still removing salt deposits, mold, mildew, and algae that thrive in the coastal environment.