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IS 7922:1987 is the Indian Standard (BIS) for recommendations for modular coordination in the building industry: vertical co-ordination. This standard provides recommendations for vertical dimensional coordination in the building industry, forming a key part of the modular coordination system. It establishes a system based on a basic module of 100 mm (1M) to standardize storey heights, floor-to-ceiling heights, and dimensions of components like doors and windows. The goal is to facilitate the use of prefabricated components and streamline the architectural design and construction process.
Recommendations for modular coordination in the building industry: Vertical co-ordination
Overview
Status
Current
Usage level
Frequently Used
Domain
Architectural — Planning, Housing and Pre-fabricated Construction
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! This standard is the conceptual foundation for setting up vertical grids and levels in architectural drawings and BIM models.
! Adherence to these modular principles is critical for projects involving prefabrication or system formwork to minimize on-site alterations and waste.
! While the standard gives preferred dimensions, always cross-check with local building bye-laws which may specify different minimums (e.g., minimum ceiling height).
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
International Equivalents
Similar International Standards
ISO 21723:2019ISO (International Organization for Standardization)
HighCurrent
Building construction — Modular coordination — Module
Defines the basic module (100 mm) and principles of modular coordination, which are foundational to IS 7922.
ISO 6512:1982ISO (International Organization for Standardization)
HighWithdrawn
Building construction — Modular co-ordination — Storey heights and room heights
Provided specific recommendations for vertical dimensions like storey and room heights, directly matching the scope of IS 7922.
BS 6750:1986BSI (British Standards Institution), UK
HighWithdrawn
Specification for modular co-ordination in building
A comprehensive national standard from the same era, establishing an almost identical system of modular coordination.
EN 15822:2010CEN (European Committee for Standardization)
MediumCurrent
Modular co-ordination for building - Co-ordinating sizes and preferred sizes
Specifies rules for deriving coordinating and preferred sizes for buildings and components based on the 100 mm module.
Key Differences
≠IS 7922:1987 is an aged standard that has not been revised, whereas the primary international standards have been updated (e.g., ISO 21723:2019) to consolidate older, fragmented documents into a more streamlined framework.
≠The Indian Standard is highly prescriptive, providing a specific list of preferred floor-to-floor heights (e.g., 2700 mm, 3000 mm, 3300 mm). International standards tend to state the principle (e.g., 'use multiples of 3M') rather than an exhaustive list.
≠IS 7922 is part of a fragmented series of Indian standards for modular coordination, whereas the ISO has consolidated many related topics (basic module, principles, rules) into single, more comprehensive standards.
Key Similarities
≈The fundamental basis for all standards is the basic module 'M' of 100 mm.
≈Both IS 7922 and its international counterparts (like the historic ISO 6512) recommend 3M (300 mm) as the primary multi-module for vertical dimensions, especially for storey heights.
≈The concept of using the finished floor level as the primary vertical controlling line (reference plane) is a shared and fundamental principle for dimensioning.
≈The methodology for coordinating dimensions is identical: storey height is a primary dimension, and clear room height is derived by subtracting the floor zone thickness, ensuring all elements fit within the modular grid.