TECHNICAL STANDARD
ISO 12944-3
Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 3: Design considerations
ISO
2017 (ISO confirms published; revision in development)
Current
WHAT DOES THIS STANDARD COVER?
Addresses design considerations for steel structures intended to receive protective paint systems, including details that can affect application, inspection, maintenance and corrosion performance.
WHY IS IT RELEVANT?
Relevant when reviewing steelwork details that may restrict surface preparation, coating application or later inspection and maintenance. The design of the substrate can affect whether a specified coating system can be applied and inspected effectively.
KEY INSPECTION CONSIDERATIONS
Review edges, joints, welds, drainage, access and other details where coating application or future inspection may be difficult, against the applicable project documents.
WHAT THE STANDARD SHOULD NOT BE USED TO ASSUME
Do not assume that choosing a protective paint system alone resolves poor steelwork detailing or makes all areas accessible for coating inspection.
PRACTICAL INSPECTION APPLICATION
Use during design and specification review to flag areas where preparation, coating and subsequent inspection or maintenance may be impractical.
RELATED TECHNICAL STANDARDS
RELATED TECHNICAL TOPICS
steelwork design; protective coating systems; access for inspection; corrosion protection; maintenance
RELATED PIL GUIDANCE
A pre-condition coating survey brings visual inspection, testing, sampling and access planning together to support evidence-based maintenance decisions.
RELATED EXPERTISE
Coating Inspection; Condition Surveys; Technical Consultancy
ABOUT THIS TECHNICAL SUMMARY
Paint Inspection Ltd provides this information to help inspectors, engineers, asset owners and contractors understand the practical relevance of commonly referenced protective coatings standards. This page is PIL technical guidance and does not reproduce or replace the published standard. Users should refer to the current published standard, project specification, coating manufacturer requirements and other applicable contract documents when establishing project requirements or acceptance criteria.
PIL TECHNICAL ASSISTANT
Ask the PIL Technical Assistant about this standard and related coating inspection topics.
ASK THE TECHNICAL ASSISTANT →
OFFICIAL STANDARD
PIL technical summaries are intended to explain the inspection relevance of industry standards and do not replace the published document.
STATUS AND SOURCE VERIFICATION
Verified 4 November 2026 against ISO publisher record: ISO 12944-3:2017, Edition 2, published and confirmed in 2023. ISO lists a revision in development. https://www.iso.org/standard/64835.html