Outdoor Power Washing Mold Removal

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Mold can grow on almost any surface. Stains and discoloration from mold growth can be unsightly on hard surfaces such as brick, concrete and patios. Mold growth can also cause damage to soft, porous surfaces such as decking and wood siding. Remove mold from outdoor surfaces easily with a power washer.

Power-Washing Equipment Options

  • Choose a machine and nozzle appropriate for the type of surface where mold is growing. Power-washing machine pressures range from 1,200 to 50,000 PSI. (Of course, the higher PSI ratings are much too powerful for home applications, used for bridges and other industrial work.) Select a power-washing machine with a PSI between 1,200 to 1,500 for mold removal on surfaces such as wood and plastic siding or other softer surfaces. Remove mold on surfaces such as decks and asphalt with a machine with a PSI between 1,500 and 2,000. Remove mold on hard surfaces, such as concrete and pavers, with a machine with a PSI between 2,000 and 3,500.

    Select a nozzle orifice size that is appropriate for the chosen machine. If the nozzle orifice size is too large, the water will be less pressurized. If the nozzle orifice is too small, the pressure may put too much strain on your machine and cause damage on the surface being cleaned from the higher pressure.

    Choose the appropriate nozzle spray angle for the surface where the mold is growing. Nozzles are available in a range from 0 degrees, which is a blasting nozzle appropriate for concrete, to 40 degrees, which is appropriate for washing cars, boats and siding. The nozzle chosen for mold removal will be determined by the type of surface being cleaned. Choose a 15 degree nozzle for solid surfaces and a 25 degree nozzle for softer surfaces.

Process to Remove Mold

  • After selecting the appropriate machine, nozzle orifice size and nozzle angle for your mold removal project, remove the mold from almost any surface easily without chemicals. Wear goggles to prevent eye injuries as well as a mask to avoid breathing mold spores.

    Start cleaning horizontal surfaces by working in small sections from one end to the other. Spray the water so that it moves away from areas that are already clean. Rinse again when the mold has been removed to reduce the risk of any mold remaining on the surface. When power-washing mold from vertical surfaces, wet the entire surface, start from the top and work in sections to the bottom. After removing mold with a power washer, allow the area to dry thoroughly to reduce mold regrowth.

Prevention

  • Eliminate or slow future mold growth with regular cleaning with a scrub brush and gentle cleansers. Increased air flow will minimize moisture in the area, which will have a dramatic effect on reducing mold growth.

References

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