What is the basic module (M) that forms the basis of modular coordination?

The basic module 'M' is 100 mm. All other preferred dimensions are multiples or sub-multiples of this value.

What is the purpose of a planning grid?

A planning grid is a reference system of orthogonal lines used to locate and coordinate the position and size of building elements, spaces, and components (Clause 6).

How does modular coordination relate component size to grid size?

The component's 'work size' is derived from the modular grid space, subtracting allowances for joints and manufacturing tolerances, ensuring components fit within the grid (Clause 5.3).

IS 6408

: 2000

Recommendations for Modular Co-ordination in Building Industry: Tolerances, Part 1: Glossary of Terms

CurrentSpecializedGuidelinesBIMArchitectural · Planning, Housing and Pre-fabricated Construction

Download PDF BIS Portal Google

This standard provides a comprehensive glossary of terms related to tolerances, deviations, and accuracy within the framework of modular co-ordination in the building industry. It aims to establish a common vocabulary for designers, manufacturers, and erectors to ensure clear communication and precision in specifications for prefabricated components and system building. This part (Part 1) is foundational for the entire IS 6408 series on tolerances.

Recommendations for Modular Co-ordination in Building Industry: Tolerances, Part 1: Glossary of Terms

Quick Reference Values

Basic Module (M)100 mm

Recommended Horizontal Multi-module3M (300 mm)

Secondary Horizontal Multi-module6M (600 mm)

Recommended Vertical Multi-module1M (100 mm)

Typical Joint Thickness Range0 to 20 mm

Practical Notes

The core principle is to design on a 'planning grid' based on the 100mm module (M), which governs the placement of structural elements and components.

A clear distinction must be made between 'grid dimensions' (controlling dimensions) and 'component work sizes', with the difference accommodating joints and tolerances.

Effective implementation requires adoption from the very beginning of the conceptual design phase and consistent application across all project disciplines (Architectural, Structural, MEP).