What PSI is needed to wash a house?

What PSI is needed to wash a house?

Most house exteriors are safely and effectively cleaned in the 1,500–2,500 PSI range, with the exact number depending heavily on the siding material. Vinyl siding and painted wood need less pressure than most people assume, typically 1,300–1,600 PSI, to avoid forcing water behind panels or stripping the finish. Brick and stucco can generally tolerate somewhat higher pressure, up to around 2,500 PSI, since they’re more durable materials. Roofs are the major exception — professionals avoid pressure washing roofing entirely, using soft washing instead to prevent stripping protective shingle granules. Rather than defaulting to the highest pressure available, match the PSI to your specific siding material, since using too much on delicate surfaces is one of the most common and costly mistakes homeowners make when washing a house themselves.