Yes — soft washing is the only appropriate cleaning method for colorbond roofs. Pressure washing strips the factory coating and voids manufacturer warranties. Here's exactly why.
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Colorbond steel is Australia's most popular roofing material and one of the most commonly misunderstood in terms of cleaning requirements. If you own a colorbond roof and you're researching cleaning options, the most important thing to understand is this: high-pressure washing on colorbond roofing is genuinely harmful and will void your manufacturer warranty. Soft washing — which uses chemical solutions at very low pressure — is specifically the correct and only appropriate cleaning method for colorbond roofs. This isn't a marketing claim: it's consistent with Bluescope Steel's own recommendations for maintaining their colorbond products.
Colorbond steel is coated with a multi-layer factory-applied paint system — typically a primer, a topcoat and a clear finish — that provides its weather resistance and its distinctive appearance. This coating system is engineered for weather exposure, not mechanical pressure. High-pressure washing can: strip and lift the paint coating; cause microscopic cracking in the coating that allows moisture penetration; leave visible pressure marks; and expose the Zincalume steel substrate to corrosion. All of these effects are irreversible.
Bluescope Steel (manufacturer of Colorbond) recommends cleaning with mild detergent and low-pressure water. High-pressure washing is explicitly contrary to their care guidelines and typically voids product warranties. When we clean colorbond roofs, we use pH-balanced cleaning solutions at 50 to 100psi — a fraction of what pressure washers operate at — which is consistent with manufacturer recommendations.
Our soft wash treatment for colorbond uses a chemical solution appropriate for the coating, applied at very low pressure. It removes biological growth (moss, algae, lichen), salt deposits and general grime from the surface without any mechanical force on the coating. The result is a clean roof with the factory coating completely intact.
Colorbond in coastal environments — Redlands, Moreton Bay, the Gold Coast — is exposed to salt-laden air that deposits on the roof surface and, combined with biological growth, creates an acidic environment that accelerates coating degradation. Regular soft wash cleaning removes both the growth and the salt deposits, significantly extending the life of the coating.
Yes — soft washing at low pressure with appropriate cleaning solutions is the correct and recommended cleaning method for colorbond roofs. It cleans effectively without damaging the factory paint coating.
High-pressure washing on colorbond is contrary to Bluescope Steel's care recommendations and typically voids product warranties. Always use low-pressure cleaning methods on colorbond.
High-pressure washing can strip the factory paint coating from colorbond, leave pressure marks, cause micro-cracks in the coating that allow moisture penetration, and expose the steel substrate to corrosion. The damage is permanent.
Every 12 to 24 months in most SEQ positions. Coastal properties and those in heavily shaded positions may benefit from annual cleaning.
Serving Redlands and all of South East Queensland. We reply within 2 hours, Mon–Sat.
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