TECHNICAL STANDARD
CM 431
Maintenance painting of steelwork
National Highways / DMRB
Version 0.1.0 — issued 30 September 2025
Under Review
WHAT DOES THIS STANDARD COVER?
A National Highways document concerning the development of maintenance-painting schemes and specifications for highway steelwork.
WHY IS IT RELEVANT?
Useful context when reviewing highway steelwork maintenance painting, condition-survey findings and coating-specification development. This record is not a statement of an approved current project requirement.
KEY INSPECTION CONSIDERATIONS
For relevant highway steelwork work, establish the controlling project documents, the recorded substrate condition and the specified coating-system requirements before drawing inspection conclusions.
WHAT THE STANDARD SHOULD NOT BE USED TO ASSUME
The official publisher record confirms CM 431 Version 0.1.0 as PUBLISHED and Revision 0 (December 2019) as superseded in September 2025. PIL technical interpretation remains Under Review; confirm project-specific requirements with the responsible authority.
PRACTICAL INSPECTION APPLICATION
Use this record as framework context when reviewing maintenance-painting proposals for highway steelwork. Confirm the applicable current source and project documentation with the responsible authority.
RELATED TECHNICAL TOPICS
Highways; steelwork; maintenance painting; condition survey; coating specification
RELATED EXPERTISE
Condition Surveys; Coating Inspection; 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.
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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
Official Standards for Highways publisher record verified 27 Sep 2026: CM 431 Version 0.1.0, issued 30 September 2025, status PUBLISHED. The publisher timeline records Revision 0 (December 2019) as superseded in September 2025. Publisher terms permit reuse of information, excluding logos, under the Open Government Licence: https://www.standardsforhighways.co.uk/terms-and-conditions.