Recommendations for modular coordination - principles and rules
1983 Edition

IS 10600:1983 (aligned with ISO 2848-1974) establishes the scope and fundamental specifications for modular coordination in building projects. The basic module (M) is defined as 100 mm, serving as the core unit for dimensional harmony. Multimodules are integral multiples of this basic module (e.g., 2M = 200 mm, 3M = 300 mm) and are applied to minimize the variety of component sizes, following ISO 1006 guidelines. Non-modular dimensions, such as certain thicknesses, can be coordinated using fractional parts of the basic module but must not define multimodules or planning modules. A reference system comprising points, lines, and planes facilitates precise location of components in both design and onsite measurement contexts.

IS 10600 corresponds with ISO 2848-1974, emphasizing modular coordination applicable to building components. It ensures dimensional consistency for straightforward assembly and component interchange. This standard is applicable to the planning, design, and manufacture of building elements, promoting standardized dimensions that reduce waste and enhance compatibility. Typical dimensions include the basic module of 100 mm, half modules of 50 mm, and larger multiples used in modular grids for floor plans, facades, and structural components.

IS 10600 adopts definitions from ISO 1791 and ISO 2848, defining modular coordination as a system that standardizes building component dimensions based on a fundamental unit (M = 100 mm). The modular grid is a layout system comprised of multiples of this module, facilitating design and manufacturing uniformity. Component sizes are expressed as integral multiples of M, with tolerances aligned to ISO 2848:1974.

The primary aim of modular coordination under IS 10600 is to harmonize building dimensions, streamlining design, manufacturing, and construction operations. The basic module (1 M = 100 mm) forms the dimensional foundation, with multimodules reducing size variations. Functional or economic considerations may necessitate non-modular sizes coordinated via submodules (fractions of M), though multimodules remain strictly multiples of M. A reference system of points, lines, and planes ensures consistency in layout and onsite measurement.

Key concepts include the basic module of 100 mm, multimodules as its integral multiples, and the accommodation of non-modular dimensions for specific functional or economic reasons using fractional submodules. The reference system of points, lines, and planes is fundamental for defining component size and location during design and construction phases, fostering dimensional coordination and reducing complexity.

IS 10600 specifies the basic module as 100 mm, serving as the core dimension. Multimodules, which are standardized multiples of this basic unit, help decrease the number of coordinating sizes, enhancing design and construction efficiency. Modular grids spaced by multimodules may vary directionally, aligning with basic module lines but permitting offsets where functionally beneficial. Non-modular sizes, particularly thicknesses, are coordinated using submodules but do not define multimodule sizes.

The standard acknowledges that not all building component sizes conform strictly to modular increments due to functional or economic factors. Non-modular thicknesses can be coordinated with simple fractional submodules of the basic module (e.g., half or quarter of 100 mm). However, multimodules and planning modules must always be based on full multiples of the basic module. The reference system aids precise positioning and measurement on site.

The reference system consists of controlling planes, lines, and zones that define spatial locations within the modular grid. Controlling planes act as key reference surfaces, with controlling zones being the spaces between these planes occupied by building elements such as walls and floors. This system ensures a modularly coordinated framework for placing components, facilitating standardized design and assembly.

The modular space-grid is a three-dimensional array of planes spaced by the basic module or multimodules, which may differ along the X, Y, and Z axes. This spatial framework provides a consistent reference for positioning building components, enabling accurate design and construction.

Modular grids are two-dimensional projections of the three-dimensional space grid, with grid lines spaced at the basic module or its multiples. Multiple modular grids can be superimposed and displaced relative to each other to accommodate different design requirements, ensuring continuous and clear referencing for all construction activities.

This grid is formed by parallel lines spaced at the basic module interval, establishing a uniform framework for laying out building components. The three-dimensional modular space grid extends this concept into spatial planes aligned along the principal directions of the building.

Multimodular grids feature lines spaced at integer multiples of the basic module, potentially differing in each horizontal direction. These grids generally coincide with the basic module grid lines but may be displaced to accommodate architectural or structural considerations, providing flexibility while maintaining modular coordination.

Modular grids can be interrupted in zones to accommodate dividing elements such as walls or shafts. Interruptions may be modular, aligning with grid increments, or neutral zones allowing for non-standard spacing. Additionally, modular grids can be displaced relative to each other in one or both directions to optimize coordination and functional layout.

The controlling reference system is composed of controlling planes serving as primary reference surfaces, controlling zones representing the spaces between these planes occupied by structural and architectural components, controlling lines depicted on drawings, and controlling dimensions that define distances between planes. This system facilitates standardized placement, sizing, and assembly of building elements.

IS 10600 establishes rules for determining preferred component sizes and controlling dimensions. Components are positioned within coordinating spaces bounded by reference planes that include allowances for joints and tolerances. Preferred sizes use general series of multimodular dimensions to reduce variability and simplify manufacturing and assembly. Components may be aligned boundary-wise or axially relative to modular lines, enhancing modular coordination and construction efficiency.