Overview
EN ISO 8560:2019 - Technical drawings: Representation of modular sizes, lines and grids is a CEN-adopted ISO standard that specifies rules for showing modular sizes (basic module M = 100 mm), modular lines and modular grids on construction and technical drawings. Primarily intended for design drawings, the standard also permits adding modular information to production drawings to help with manufacturing, orientation and location. EN ISO 8560:2019 supersedes earlier editions and is aligned with ISO/TC 10 guidance for construction documentation.
Key topics and requirements
- Basic module: The standard uses the basic module M = 100 mm (see ISO 1006).
- Designation of sizes: Modular sizes are indicated using symbols such as n × M, M, multimodules like 3 M, 6 M, 12 M, and combinations (e.g., 10 × 3 M).
- Line types:
- Modular and multimodular lines are shown with continuous lines; the smallest interval is drawn with a continuous thin line.
- Modular lines in axial positions may be shown as chain lines where clarity is needed.
- Identification circles (thin-lined) can terminate multimodular grid lines and may contain a reference designation.
- Terminations and dimensioning: Terminations for modular zones follow the same rules as single sizes as per ISO 129-1.
- Modular grids:
- Grids with varying intervals can be differentiated by line weight (thin for smallest, thicker for larger intervals).
- The standard defines conventions to indicate grid interval sizes, modular vs non-modular zones, changes in grid direction, and grid displacement.
- Combining sizes: Rules and examples are provided for combining modular sizes and work sizes on the same drawing.
- Normative presentation: Drawings using modular sizes must conform to ISO 128‑1 and ISO 129‑1, and should note when modular sizing is used.
Applications and users
EN ISO 8560:2019 is practical for:
- Architects, structural and building services designers preparing construction drawings
- CAD technicians and drafters standardizing drawing presentation
- Manufacturers, fabricators and contractors who use modular information for orientation, manufacturing or site layout
- Project managers and BIM coordinators who need consistent modular coordination across disciplines
Benefits include improved modular coordination, easier interpretation of repetitive dimensions, and clearer communication between design and production teams.
Related standards
Relevant references quoted by EN ISO 8560:2019:
Keywords: EN ISO 8560:2019, modular sizes, construction drawings, modular grid, basic module M = 100 mm, technical drawings, modular lines, CAD.