Recommendations for modular co-ordination: basic module and submodular increments (Equivalent to ISO 1006 and ISO 651: 1982)
1986 Edition

Overview of IS 10316: Scope & Fundamental Specifications

Scope (Clause 1.1)

• Establishes the basic module (M) and sub-modular increments for modular coordination in construction.
• Pertains to components, parts, and the construction process.
• Suggests preferred modular increment values to unify sizing.

Basic Module & Sub-Modular Increments (Clause 4.2.6 & Table 1)

• Only a single sub-modular increment is to be applied per project (Clause 4.2.5).
• "L" marks limit values.

SI Units & Terminology (for clarity)

• Length measured in metres (m)
• Force in newtons (N) = 1 kg·m/s²
• Pressure in pascals (Pa)

IS 10316: Key Definitions and Symbols

1. Basic Module (M):

• The primary unit for modular coordination in construction.
• Recommended values for M include: 20, 25, 40, 50, 60, 75, 80, 100, 120, 125, 140, 150, 160, 175, 180, 200, 220, 225, 240, 250, 260, 275, 280, 300 mm.

2. Sub-Modular Increments:

• Used to divide the basic module into smaller units.
• Three priority levels:
  • First: M/2
  • Second: M/4
  • Third: M/8 (or M/S as per Table 1)

3. SI Units and Symbols:

• Base units: metre (m), kilogram (kg), second (s), ampere (A), kelvin (K), candela (cd), mole (mol).
• Supplementary units include plane angle (radian) and solid angle (steradian).

4. Derived Units:

Diagram: Modular Coordination Structure

graph LR
    A[Basic Module (M)] --> B[First Preference: M/2]
    A --> C[Second Preference: M/4]
    A --> D[Third Preference: M/8 (M/S)]
    B --> E[Preferred Values]

IS 10316: Prescribed Values for Modular Units

1. Basic Module and Sub-Divisions (Clause 4.2.6)

• Basic Module (M): The core measurement unit.
• Sub-Modular Increments: Portions of M designated for specific dimensional preferences.

2. Preferred Numeric Values (Table 1)

IS 10316: Essential Information on Basic Module (M)

Definition (Clauses 3.1 & 4.1)

• The basic module (M) is the principal measurement unit utilized in modular coordination, serving as the dimensional reference for building components.

Basic Module Values & Subdivisions (Clause 4.2.6 & Table 1)

• Sub-modular increments are fractional parts of M:
  • First preference: M/2
  • Second preference: M/4
  • Third preference: M/S (S represents a chosen divisor)

Remarks

• "L" signifies limit values.
• Units conform to SI standards.

IS 10316: Overview of Sub-Modular Increments

• The basic module (m) represents the core dimensional unit in modular coordination.
• Sub-modular increments are fractional segments of the basic module used for enhanced dimensional granularity.

Definition (Clause 2.2)

Sub-modular increment = fraction × basic module (m)

Important Points (Clauses 3.2 & 4.2.1)

• Sub-modular increments enable dimensions smaller than the basic module.
• These increments adhere to globally accepted standard values.
• Applied when detailed sizing beyond the basic module is necessary.

Common Sub-Modular Fractions (from Fig. 1 and practice):

Expression:

[ \text{Sub-Modular Increment} = \frac{m}{n} \quad \text{where } n = 2, 3, 4, 5, ... ]

Illustration

flowchart LR
    A[Basic Module (m)] --> B[Sub-Modules]
    B --> C[1/2 m]
    B --> D[1/3 m]
    B --> E[1/4 m]
    B --> F[1/5 m]

Sub-modular increments support precise dimensioning aligned with modular coordination principles as per IS 10316.

IS 10316: Instructions for Applying Modular Coordination

Fundamental Concepts:

• Basic Module (M): Central dimensional unit.
• Sub-Modular Increments: Fractional portions of M used for more detailed sizing.

Clause 4.2.6 - Preferred Sub-Divisions (Table 1)

• "L" marks limit values.
• The primary preferred increment is M/2, followed by M/4 and then M/S (S as specified divisor).

SI Units & Terminology:

• Length (m), Mass (kg), Time (s), Force (N = kg·m/s²), Pressure (Pa = N/m²), etc.
• Consistent application of SI units is recommended.

Recap:

• Employ the basic module (M) as the dimensional base.
• Select a single preferred sub-modular increment per project.

IS 10316: Core Principles of Dimensional Coordination

Central Ideas:

• Basic Module (M): The standard length unit ensuring uniformity among building parts.
• Work Size vs Coordinating Size:
  Work size equals coordinating size minus allowances for joints and tolerances (Clause 3.3).

Modular Coordination Framework:

• Design is simplified by utilizing multiples of the basic module (M).
• Structural components are sized as whole or fractional multiples of M.
• This enhances prefabrication, reduces costs, and ensures interchangeability.

Typical Values:

Dimensional Formula:

• Coordinating Size = n × M (n integer)
• Work Size = Coordinating Size − (joints + tolerances)

Practical Implementation:

• Design doors, windows, panels in multiples of M.
• Use sub-modular increments for precision.

flowchart LR
    A[Basic Module (M)] --> B[Coordinating Size = n × M]
    B --> C[Work Size = Coordinating Size − Joint & Tolerance]
    C --> D[Dimensioned Building Components]
    D --> E[Facilitates Prefabrication & Cost Savings]

References:

• ISO 1005-1973 (Basic Module)
• ISO 6514-1982 (Sub-Modular Increments)

This system promotes dimensional consistency and rational design in construction.

IS 10316: Application in Design and Project Planning

1. Basic Module & Sub-Divisions (Clause 4.2.6 & Table 1)

• Basic Module (M): Principal unit for modular coordination.
• Sub-Modular Increments: Divisions of M for detailed dimensioning.

• Only one sub-modular increment should be uniformly applied per project (Clause 4.2.5).

2. SI Units and Definitions

• Length in metres (m)
• Force in newtons (N = kg·m/s²)
• Pressure/stress in pascals (Pa = N/m²)
• Energy in joules (J = N·m)
• Power in watts (W = J/s)

Design Summary:

• Choose a preferred sub-modular increment (preferably M/2).
• Utilize increments from Table 1 for component sizing.
• Maintain modular coordination to streamline construction and minimize errors.

flowchart LR
    A[Basic Module (M)] --> B[Sub-Modular Increments]
    B --> C1[First Preference: M/2]
    B --> C2[Second Preference: M/4]
    B --> C3[Third Preference: M/S]
    C1 --> D1[50, 100, 150, 200, 250, 300 mm]
    C2 --> D2[25, 75, 125, 175, 225, 275 mm]
    C3 --> D3[20, 40, 60, 80, 120, 140, 160, 180, 220, 240, 260, 280 mm]

IS 10316: Ensuring Compatibility in Prefabricated Building Components

This standard stresses the importance of modular coordination using a basic module (M) and sub-modular increments to guarantee dimensional harmony.

Highlights:

• Basic Module (M): Controls sizes of building parts.
• Sub-Modular Increments: Enable finer adjustments for enhanced fitting and assembly.

Table 1: Preferred Sub-Modular Increments (Clause 4.2.6)

• "L" indicates limit values.
• Work sizes differ from coordinating sizes to allow for joints and tolerance (Clause 3.3).

Specifications:

• Use M/2 as the primary increment.
• Employ M/4 or M/8 for finer dimensioning when necessary.
• Adhere to SI units (meters, millimeters).
• Modular coordination promotes cost savings and prefabrication efficiency.

Conceptual Diagram: Modular Coordination

graph LR
A[Basic Module (M)] --> B[Sub-Module M/2]
A --> C[Sub-Module M/4]
A --> D[Sub-Module M/8]
B --> E[Prefabricated Components]
C --> E
D --> E
E --> F[Assembly with Tolerance Allowances]

Consult IS 10316 Table 1 for selecting appropriate modular increments to facilitate assembly and compatibility.

IS 10316: International Alignment in Modular Coordination

Core Concepts:

• Modular coordination standardizes building dimensions via a basic module (M) to streamline component design and minimize costs.
• IS 10316 corresponds with ISO 1005-1973 (basic module) and ISO 6514-1982 (sub-modular increments).

Basic Module and Sub-Module Preferences

• "L" marks limit values.
• Utilize increments M/2, M/4, or M/S for detailed dimensioning.

SI Units for Modular Coordination

Summary

• Modular coordination simplifies design by adopting multiples and subdivisions of the basic module (M).
• Sub-modular increments (M/2, M/4, M/S) provide customization.
• Aligns Indian standards with international ISO norms for global interoperability.

flowchart LR
    A[Basic Module (M)] --> B[First Preference: M/2]
    A --> C[Second Preference: M/4]
    A --> D[Third Preference: M/S]

IS 10316: Restrictions Pertaining to Sub-Modular Increments

Essential Points:

• Basic Module (M): The core length unit.
• Sub-Modular Increment: Fractional portions of M used to refine dimensions (Clause 2.2).

Limitations:

• Only a single type of sub-modular increment (M/2, M/4, or M/8) must be consistently employed throughout a project (Clause 4.2.5).
• Sub-modular increments are prohibited for establishing distances between modular reference planes (Clause 4.2.2).

Preferred Values (Table 1):

• "L" indicates limit values.

SI Units Reference:

• Length (m), Force (N = kg·m/s²), Pressure (Pa = N/m²), etc. as per the SI unit clause.

flowchart LR
    A[Basic Module (M)] --> B[Sub-Modular Increment]
    B --> C{Select One Increment Type}
    C --> D[M/2 (Primary Preference)]
    C --> E[M/4 (Secondary Preference)]
    C --> F[M/8 (Tertiary Preference)]
    A --> G[Modular Reference Planes]
    G -.->|Sub-Modular Increments Not Allowed| B

Summary: Adopt a single sub-modular increment type throughout design; avoid using sub-increments for grid spacing; adhere to Table 1 preferred values.

IS 10316: Notational System for Modular Coordination

Principal Definitions:

• Basic Module (M): The foundational measurement unit.
• Sub-Modular Increment: A fractional segment of M for refined dimensional control.

Sub-Modular Increments (Clause 4.2.6 & Table 1):

Note: "L" denotes limit values in tables.

Selected SI Units and Symbols:

Summary:

• Employ the basic module (M) as the primary dimension.
• Utilize sub-modular increments (M/2, M/4, M/8) for finer detailing.
• Follow SI units and symbols consistently.

flowchart LR
    A[Basic Module (M)] --> B[First Preference (M/2)]
    A --> C[Second Preference (M/4)]
    A --> D[Third Preference (M/8)]
    B --> E[Common Sizes: 50, 100, 150...]
    C --> F[Common Sizes: 25, 75, 125...]
    D --> G[Common Sizes: 20, 40, 60...]