Rust on a Colorbond roof should be assessed before paint or sealant is applied. The cause can involve coating damage, trapped moisture, contamination, unsuitable contact or installation details, and the remedy depends on the finding.
Inspect the area and nearby details
Note whether corrosion appears at a cut edge, fastener, lap, penetration or area where debris collects. Do not walk on the roof to investigate; photograph from the ground or ask a roofer to inspect.
Check material compatibility
Dissimilar materials and metal swarf can contribute to corrosion in some situations. Ask the contractor to consider adjacent materials, drainage and any recent cutting or installation work.
Choose a repair that treats the cause
A suitable repair may involve cleaning, replacing a component or addressing a detail rather than only covering rust. Ask for the proposed preparation, compatible product and future maintenance advice in writing.
Describe the roof concern to an independent professional.
Request a connection and discuss the property, quote and any next steps directly with the contractor.
Related services and suburbs
This article provides general information only. Roof conditions, safety risks, approvals and suitable work vary between properties; ask an appropriately qualified professional to assess your roof.