For cleaning your house’s driveway, use 2,500 to 3,000 psi. For vinyl sidings, decks, or glass, do not exceed 1,500 psi. Use 500 to 600 psi for softwood.
To clean concrete floors, use at least 3,000 psi and 4 gallons per minute.
Manufacturer’s Instructions and Testing
Read the manufacturer’s instructions on cleaning different materials. Test a small area first before washing the whole surface.
Material Specifics
Aluminum siding can handle 1,200 to 1,500 psi. Higher pressures may damage thin aluminum.
For patios and roofs use 500 to 1,000 psi to avoid damage.
The recommended range for houses is 1,500 to 3,000 psi. Start low and gradually increase as needed. Concrete and brick may need more, while wood and paint need less.
Cleaning Frequency
In general, wash house exteriors thoroughly once a year. Add more as needed.
Using the wrong psi can lead to interior and exterior damage from temperature loss and water seepage.