What is the value of the basic module 'M' in India?

The basic module 'M' is defined as 100 mm (Clause 2.4).

What is Modular Coordination (MC)?

It is a dimensional coordination system based on the basic module 'M', used to dimension building components and the building itself to reduce complexity and improve interoperability (Clause 2.15).

What is a multimodule?

A multimodule is a standardized larger unit which is a direct multiple of the basic module (e.g., 3M = 300 mm). They are used for coordinating larger components and spaces (Clause 2.21).

Why is this code important for BIM?

The principles of modular grids and standardized component dimensions defined here are core to creating efficient, clash-free, and manufacturable BIM models.

IS 4993

: 1983

Glossary of terms relating to modular coordination

CurrentSpecializedTerminologyBIMArchitectural · Planning, Housing and Pre-fabricated Construction

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This standard provides a comprehensive glossary of terms related to modular coordination in the building industry. It establishes the fundamental principles and definitions, such as the basic module (100 mm), multimodules, and various types of grids and dimensions. The goal is to promote standardization of building components for easier design, manufacturing, and assembly.

Glossary of terms relating to modular coordination

Quick Reference Values

Basic Module (M)100 mm

Preferred Horizontal Multimodules3M, 6M, 12M, 15M, 30M, 60M

Preferred Vertical Multimodules3M, 6M

Tolerance for manufacturing (general)±1 mm to ±3 mm

Practical Notes

The fundamental principle of this code is the use of a basic module 'M' which is internationally and nationally accepted as 100 mm.

This code is the theoretical foundation for all design and manufacturing based on prefabrication and system building in India.

Though an old code (reaffirmed 2018), its principles are highly relevant for modern methods like BIM, off-site manufacturing, and DfMA (Design for Manufacturing and Assembly).