ISO 4172:2024

Overview

ISO 4172:2024 - Technical product documentation (TPD) - Construction documentation - Drawings for the assembly of prefabricated structures defines general requirements for preparing construction drawings used for the field assembly of prefabricated structures in building and civil engineering works. The third edition updates normative references, clarifies drawing hierarchy and levels, and aligns presentation rules with related TPD and BIM standards to promote consistent, unambiguous assembly documentation.

Key Topics

• Types of drawings and hierarchy: specifies required documents such as general arrangement drawings, assembly drawings, component drawings, detail drawings, component schedules / parts lists, and specifications.
• Presentation rules: guidance on views, scales and presentation consistent with ISO 7519 to ensure readable assembly information.
• Application of lines: prescribes line types and usage (references ISO 128-2 line numbers) for outlines, visible/hidden edges and simplified single-line representations.
• Dimensions and tolerances: references presentation of dimensions (ISO 129-1), limit deviations (ISO 6284) and GPS dimensional tolerancing (ISO 14405), supporting accurate on-site assembly.
• Designation and documentation data: rules for naming, simplified designations and title-block data fields (ISO 7200) so components, assemblies and drawings are traceable.
• Information flow & BIM/CAD compatibility: encourages coordination with ISO 7519 and BIM principles to structure product information across the supply chain.

Applications and Who Uses It

ISO 4172:2024 is intended for professionals creating or using construction documentation for prefabricated structures, including:

• Architects and structural designers producing assembly and general arrangement drawings.
• Engineers and detailers preparing component and detail drawings with tolerances.
• Manufacturers and fabricators using parts lists and component schedules for production and quality control.
• Contractors and site assemblers relying on clear assembly drawings for on-site erection.
• BIM/CAD managers integrating TPD into digital workflows to ensure consistent information delivery.

Practical benefits include improved clarity of assembly instructions, reduced on-site errors, streamlined prefabrication workflows, and better interoperability between CAD/BIM and fabrication teams.

Related Standards

Key normative references (as cited in ISO 4172:2024) include:

• ISO 129-1 (dimensions and tolerances)
• ISO 128-2 (line types)
• ISO 7519 (presentation principles for arrangement/assembly drawings)
• ISO 7200 (title-block data fields)
• ISO 6284, ISO 7573, ISO 10209, ISO 6707-1, ISO 14405

Adopting ISO 4172 supports consistent, standardized construction documentation for prefabricated structures and enhances communication across the design-to-assembly supply chain.