Roof soft washing is the only cleaning method we’ll use on Colorbond steel, terracotta tiles, and any coated or painted roof surface. These materials have factory-applied finishes that high-pressure water strips, scratches, or compromises — and once that coating is damaged, you’re looking at premature corrosion and a warranty claim that won’t go anywhere. We apply professional-grade surfactant solutions at 200–500 PSI that do the heavy lifting chemically, not mechanically. The solution penetrates beneath the visible growth and kills mould, algae, and lichen colonies at the root system, which is why soft-washed roofs stay cleaner for longer than pressure-washed ones. We’ve seen too many Colorbond roofs in Brisbane with scour marks from pressure washers — once those scratches are in the Activate coating, they don’t come out.
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Service Overview
Roof soft washing is the only cleaning method we’ll use on Colorbond steel, terracotta tiles, and any coated or painted roof surface. These materials have factory-applied finishes that high-pressure water strips, scratches, or compromises — and once that coating is damaged, you’re looking at premature corrosion and a warranty claim that won’t go anywhere. We apply professional-grade surfactant solutions at 200–500 PSI that do the heavy lifting chemically, not mechanically. The solution penetrates beneath the visible growth and kills mould, algae, and lichen colonies at the root system, which is why soft-washed roofs stay cleaner for longer than pressure-washed ones. We’ve seen too many Colorbond roofs in Brisbane with scour marks from pressure washers — once those scratches are in the Activate coating, they don’t come out.
What's Included
Our roof soft washing service covers the entire roof surface — sheets or tiles, ridge capping, hip ridges, valleys, barges, and all flashings. We pre-treat heavy growth areas with a concentrated surfactant application and allow proper dwell time before the main wash. All roof penetrations (vents, skylights, whirlybirds, antenna mounts) are cleaned around carefully. Gutters are flushed after the wash to clear all runoff and debris. We include a full roof condition inspection as standard — cracked tiles, loose ridge capping, deteriorated pointing, and flashing failures are documented and reported to you in writing with photos.
Surfaces We Clean
Roof soft washing is specifically designed for surfaces that cannot tolerate high-pressure water. That includes all Colorbond and Zincalume steel roofing (including the older Colorbond Ultra and current Colorbond Matt finishes), glazed and unglazed terracotta tiles, painted concrete tiles, cement-fibre sheeting, and heritage slate. We also soft wash architectural metal roofing like Lysaght Klip-Lok and Stramit Speed Deck profiles where the standing seam and clip fixings need careful handling. Each surface gets a tailored chemical dilution — terracotta glaze is more chemically sensitive than Colorbond’s polyester coating, so the mix is adjusted accordingly.
Our Method (Soft Wash / Pressure Wash)
Safety setup comes first — harness systems, anchor points, and edge protection as required by the roof pitch and layout. We do a full walk-over inspection noting growth type, severity, and any existing damage. Heavy moss and lichen patches get a pre-soak with concentrated surfactant to start breaking down the root systems. The main wash applies our surfactant blend across the entire roof at low pressure using wide fan nozzles, working from the ridge down. After a 10–20 minute dwell period, we rinse thoroughly with clean water at low pressure, again working top to bottom. Gutters get a final rinse to clear any wash runoff.
Why Brisbane Properties Need This
Brisbane’s humidity and warmth make Colorbond and tile roofs a target for biological growth that other Australian cities simply don’t see at the same rate. South-facing roof planes can develop visible algae within 6 months of cleaning in the right conditions. The salt air corridor from Moreton Bay through to the inner suburbs adds another layer of stress — salt deposits attract moisture and accelerate organic colonisation on roof surfaces. Roof soft washing removes this growth without compromising the protective coatings that your roof relies on to resist Brisbane’s intense UV exposure and corrosive coastal air. It’s maintenance that actually protects your investment rather than degrading it.
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Roof soft washing is the only cleaning method we’ll use on Colorbond steel, terracotta tiles, and any coated or painted roof surface. These materials have factory-applied finishes that high-pressure water strips, scratches, or compromises — and once that coating is damaged, you’re looking at premature corrosion and a warranty claim that won’t go anywhere. We apply professional-grade surfactant solutions at 200–500 PSI that do the heavy lifting chemically, not mechanically. The solution penetrates beneath the visible growth and kills mould, algae, and lichen colonies at the root system, which is why soft-washed roofs stay cleaner for longer than pressure-washed ones. We’ve seen too many Colorbond roofs in Brisbane with scour marks from pressure washers — once those scratches are in the Activate coating, they don’t come out.
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Frequently Asked Questions
What is roof soft washing?
Roof soft washing uses low-pressure water (200–500 PSI) combined with biodegradable surfactant solutions to clean roof surfaces without damaging protective coatings. The chemicals do the cleaning work, not water pressure. It’s the manufacturer-recommended method for Colorbond steel and the safest approach for terracotta and painted tiles. The surfactant kills growth beneath the surface, so results last significantly longer than a pressure wash.
Is soft washing safe for Colorbond roofs?
Yes — roof soft washing is the only method BlueScope recommends for cleaning Colorbond. High-pressure washing scratches the Activate coating and voids warranty coverage. We keep pressure under 500 PSI and use surfactants that are compatible with Colorbond’s polyester top coat. We’ve cleaned hundreds of Colorbond roofs across Brisbane without a single coating damage issue.
How long does a roof soft wash last in Brisbane?
Most Brisbane roofs stay clean for 12 to 24 months after a professional soft wash, depending on shade, orientation, and proximity to vegetation. Adding a biocide treatment after the soft wash can extend this to 3 to 5 years by preventing regrowth at a biological level. South-facing roof planes in heavily shaded areas will always be the first to show regrowth, but even these benefit from the deeper clean that soft washing provides.
Can you soft wash a concrete tile roof?
Yes, and we often do for routine maintenance on concrete tiles with light to moderate growth. However, if your concrete tiles have heavy moss or thick lichen buildup, pressure washing is more effective at removing the bulk before a soft wash or biocide treatment finishes the job. We’ll assess your concrete tile roof and recommend the best approach — sometimes a combination of both methods gives the best result.
Do I need to be home during roof soft washing?
Not necessarily, as long as we have access to an outdoor tap and clear access around the house. We do prefer a quick walk-around with you before we start so we can point out any areas of concern and confirm the scope. If you can’t be there, we’ll send you the before-and-after photos and condition report by email the same day. Call us on 1300 580 435 to arrange a time that works for you.