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Pressure Washers for Building Exteriors
How Much Pressure Is Safe for Each Surface?
Match pressure to the material: 3,000-plus PSI for concrete and brick, but a wider tip and lower pressure, or soft washing with detergent, for siding, stucco, and painted surfaces. High pressure cracks stucco and forces water behind siding, so the tip angle and distance matter as much as the machine rating. A 25 to 40 degree tip spreads force over more area on delicate surfaces, and an adjustable soft-wash nozzle lets you apply cleaner at low pressure and rinse at higher pressure without swapping tips.
Can You Pressure Wash Siding and Stucco Without Damage?
Yes, with care. Use a wide tip, more distance, and lower pressure, or soft-wash with a cleaning solution and rinse gently. Test a small area first and angle the spray downward so you do not drive water up behind the siding into the wall cavity. For mildew, let a detergent or bleach-based house wash dwell for several minutes and rinse rather than blasting it, since pressure only spreads spores while the chemical is what actually kills them.
What About Runoff from Exterior Washing?
Wash water from building exteriors can carry paint, mildew treatment, and sediment into storm drains, which stormwater rules regulate. Review the EPA stormwater discharge guidance and local requirements, and capture runoff where the job or the detergent calls for it. Simple berms, drain covers, and a wet vacuum are usually enough on a mid-size building, and planning them in keeps a routine wash from becoming a compliance problem.
Related: Pressure Washers · Hot Water Pressure Washers · Pressure Washers for Concrete · Gas Pressure Washers
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