A rust-protection specification should identify the environment, surface preparation and complete coating system. A visible coat of paint alone does not show that the specified treatment has been applied.
Before fabrication and finishing
Tell the designer and fabricator where the steel will be used and whether later access will be possible. Resolve connections and inaccessible surfaces as part of the detail. Use SteelConstruction.info’s corrosion-protection guidance for the specification context rather than a universal paint thickness from an online article.
Keep the system compatible
Where the project includes fire protection, verify compatibility between the preparation, primer, intermediate coatings and assessed fire-protection product. Follow the specified manufacturer’s instructions for application conditions and repair. Substituting a visually similar product can change the system.
Inspect and record
Ask who checks preparation and coating application, how transport or installation damage is repaired, and what records are supplied. Retain product names, relevant documents and maintenance instructions with the project pack.
If an existing beam is corroded, an engineer must assess its condition before cosmetic treatment is assumed to solve the problem. Our weight and deflection calculators do not assess corrosion loss or residual structural resistance.
Structural work requires a chartered structural engineer and the applicable Building Control approval. This educational article has not received an independent engineering review.