What is the symbol for a basic module (1M) grid line?

A thin continuous line with a small circle at its end containing the grid reference (Clause 3.1).

How is a structural floor level indicated?

Using a solid black triangle pointing downwards, placed next to the level dimension (Clause 4.1).

What symbol is used to identify a non-modular component?

An arrow pointing to the component with the letter 'N' enclosed in a circle (Clause 5.3).

How are multimodular grid lines represented?

By a long-dashed dotted line with a small circle at its end (Clause 3.2).

IS 11775

: 1986

Recommendations for modular co-ordination: notations and symbols for modular drawings

CurrentSpecializedGuidelinesBIMArchitectural · Planning, Housing and Pre-fabricated Construction

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This standard provides recommendations for a unified system of notations and symbols for use in modular drawings. It aims to standardize the graphical language for modular grids, levels, components, and joints to ensure clarity and consistency in construction documents, particularly for prefabricated and system-built projects.

Recommendations for modular co-ordination: notations and symbols for modular drawings

Practical Notes

This standard is the graphical 'language' for the principles of modular coordination outlined in IS 11774.

Essential for architects and drafters working on prefabricated or system-built projects to ensure clear communication with manufacturers and site teams.

The concepts of standardized grids and component symbols are foundational to modern BIM workflows, making this standard conceptually relevant even today.