Recommendations for co-ordination of dimensions in buildings-Arrangements of building components and assemblies, Part 1: Functional group 1 Structures

IS 7564 Part 1 (1974) — Introduction & Scope Summary

Scope (Clause 1.1)

• Applies to Functional Group 1 - Structure, including:
  • Foundations
  • Floors (solid, hollow core, ribbed, joisted, built-up)
  • Roofs (solid, hollow core, ribbed, joisted, built-up, shell)
  • Floor and roof beams, roof trusses, arches
  • Columns, load-bearing walls
  • Staircases, ramps, raker beams

Key Concept (Clause 3.1)

• Uses "co-ordination of dimensions" to align building components so they function together efficiently.
• Coordination is needed only when components perform a joint function.

Recommended Co-ordinating Dimensions (Clause 4.1, Table 1)

• Dimensions categorized as Length, Width, Height, Depth/Thickness.
• Grading system: A, C, etc., indicating importance or type of dimension control.
• Example for Foundations: Thickness = 1 unit (others not specified).
• For Floors and Roofs: Length, Width, and Thickness are coordinated as per assembly type.
• Cross-references to other functional groups are provided for integration.

Example Extract from Table 1 (Functional Group 1 - Structure)

Notes:

• The standard aligns with international practices (BSPD 6432 Parts 1 & 2).
• Dimensions marked ✓ are recommended for coordination.
• Grading "A" indicates primary coordination dimensions; "C" secondary or accessories.

flowchart LR
    A[Functional Group 1 - Structure

IS 7564 Part 1 - Scope & Key Specifications

• Scope:
  Defines co-ordinating dimensions for building components/assemblies in Functional Group 1 - Structure to ensure dimensional compatibility for construction.

• Key Concept:
  "Co-ordination of dimensions" means correlating sizes of multiple components to function together without conflict.

• Grading:
  Components are graded (A, C, etc.) based on precision and function.

• Table 1 Highlights (Recommended Co-ordinating Dimensions):

• Notes:
  • ✓ = Coordinating dimension applies.
  • Depth/thickness often critical for structural integrity.
  • Cross references to other functional groups ensure integration.

Definitions:

• Basic Size (Clause 2.9): Reference size fixing limits of size.
• Grading (Clause 3): Quality/precision classification of components.

Summary Diagram of Co-ordination Concept:

graph LR
A[Component 1] -- Length, Width, Depth --> B[Component 2]
B -- Dimension Compatibility --> C[Functional Assembly]
C --> D[Structural Integrity & Function]

This standard aligns with international practices (e.g., BSPD 6432) to promote dimensional harmony in structural components.

IS 7564 (Part 1) - 1974: Key Definitions & Specifications

1. Definitions (Clause 2.0)

• The standard defines terms specifically for building components and assemblies.
• Example:
  • Basic Size (Clause 2.9): The reference size from which size limits are determined.

2. Co-ordinating Dimensions (Clause 4.1 & Table 1)

• Specifies recommended dimensions for building components in Functional Group 1 - Structure.
• Dimensions include Length, Width, Height, Depth/Thickness.
• Components are graded (A, C, etc.) indicating their precision or function.

3. Sample Extract from Table 1 (Functional Group 1 - Structure)

(✓ indicates recommended dimension control)

4. Grading of Components

• A: High precision components (e.g., slabs, joists)
• C: Accessories or reinforcement bars with less stringent dimensional control

Summary:

• Use Basic Size as reference for tolerances.
• Refer Table 1 for dimension coordination by component type and grading.
• Dimensions controlled mainly: Length, Width, Depth/Thickness; Height often not controlled.
• Grading guides manufacturing precision and functional importance.

flowchart LR
    A[Basic Size] --> B[Dimension Limits]
    B --> C[Component Grading (A, C)]
    C --> D[Recommended Dimensions]
    D --> E{Functional Group 1 - Structure}
    E --> F[Foundation, Floors, Roofs, Beams]

For detailed dimensions and cross references, consult Table 1 of IS 7564 Part

IS 7564 Part 1: Grading & Coordinating Dimensions of Components and Assemblies

1. Grading of Components (Clause 3.1)

• Grade A: Essential dimensional coordination (critical components/assemblies).
• Grade B: Dimensional coordination needed in some cases.
• Grade C: No dimensional coordination required.

2. Basic Size (Clause 2.9)

• Reference size fixing limits of size for components.

3. Coordinating Dimensions (Clause 4.1 & Table 1)

• Dimensions considered: Length, Width, Height, Depth/Thickness.
• Coordination applies mainly to Grade A components.
• Examples from Table 1 for Functional Group 1 - Structure:

4. Key Notes

• Grade A components require strict dimensional control.
• Grade C components like reinforcement bars and fixing accessories do not require coordination.
• Net sizes of formwork are derived from component sizes.

Summary Table for Grading and Dimensions

flowchart TD
    A[Components/Assemblies] --> B{Grading}
    B -->|A| C[Essential Coordination]
    B -->|B| D[Partial Coordination]
    B -->|C| E

IS 7564 Part 1 - Co-ordinating Dimensions of Building Components (Functional Group 1 - Structure)

The key recommendations for co-ordinating dimensions focus on Length, Width, Height, and Depth/Thickness of various structural elements to ensure modular coordination and ease of assembly.

Key Points from Table 1 (Clause 4.1):

Grading:

• A: Primary coordinating dimensions
• C: Secondary or fixing accessories, generally no coordinating dimensions

Summary:

• Length and Width are the primary coordinating dimensions for most assemblies.
• Height is generally not coordinated except in specific cases.
• Depth/Thickness is critical for foundations, slabs, and beams.
• Use modular increments for Length and Width to facilitate assembly.

Practical Use:

• Design structural components with standard modular sizes for Length and Width (e.g., multiples of 600 mm or 1200 mm).
• Maintain consistent depth/thickness for foundations and slabs.
• Coordinate formwork and reinforcement bars as per the grading (usually

IS 7564 Part 1: Application of Modular Coordination to Structural Elements

Key Points from Clause 4.1 & Table 1 (Functional Group 1 - Structure)

• Modular Coordination aims to correlate dimensions of building components to ensure compatibility and functional assembly.
• The building is divided into 5 functional groups, with Group 1 covering Structural Elements.

Recommended Coordinating Dimensions for Structural Elements (Functional Group 1):

Grading:

• A: Primary coordinating dimensions (length, width, depth/thickness)
• C: Non-coordinated or accessory components

Notes:

• Net sizes of formwork panels are derived from component sizes.
• Coordinating dimensions help in modular design, reducing wastage and improving interchangeability.
• Cross-references to other functional groups ensure integration with external envelope, internal subdivision, and services.

Summary Table of Coordinating Dimensions

Conceptual Diagram:

IS 7564 (Part 1) - Recommendations for Foundations: Key Points

• Scope: Coordination of dimensions for structural elements including foundations.
• Foundation Grading: Grade C (as per Table 1).
• Co-ordinating Dimensions for Foundations:
  • Depth/Thickness: Recommended dimension is 1 unit (standard modular coordination unit).
  • Length, Width, Height: Not specifically coordinated in this table.
• Purpose: Ensures compatibility with other building components for efficient construction.

Summary Table Extract (Foundations)

Additional Notes:

• The modular coordination unit (often 100 mm or 1 module) is used to standardize dimensions.
• Foundation thickness is critical for structural stability and must align with modular coordination for integration with superstructure elements.
• For detailed design (load calculations, soil bearing capacity), refer to IS 6403, IS 2911 series.

flowchart TD
    A[Foundation] --> B[Grade C]
    B --> C[Depth/Thickness = 1 module]
    A --> D[Length, Width, Height: Not specified]
    C --> E[Ensures dimensional coordination with other components]

For foundation design, IS 7564 focuses on dimensional coordination rather than structural design formulas. Use this for planning and modular layout.

IS 7564 Part 1 - Recommendations for Floors and Roofs

Key Points from Clause 4.1 and Table 1:

• Functional Group 1 covers structural elements: foundations, floors, roofs, beams, trusses, columns, walls, stairs, ramps.
• Co-ordinating dimensions (length, width, height, depth/thickness) are standardized for assemblies/components to ensure modularity and compatibility.

Floors (Assembly: A grading)

Roofs (Assembly: A grading)

Notes:

• Selected means dimension is standardized/coordinated.
• Unselected means dimension is not standardized.

IS 7564 (Part 1) - Recommendations for Beams and Trusses

Key Points from Clause 4.1 & Table 1:

• The standard provides recommended coordinating dimensions for structural elements (beams, trusses, etc.) to ensure functional integration.
• Applies to foundations, floors, roofs, floor & roof beams, roof trusses, columns, walls, staircases, ramps, and raker beams.
• Dimensions are categorized as Length, Width, Height, Depth/Thickness with grading A (primary), C (secondary), or 1,4 (special).

For Beams and Trusses (Structural Floor and Roof Beams):

• "Yes" means dimension coordination is recommended for that parameter.
• Beam depth/thickness is critical for structural performance and coordination.

General Recommendations:

• Use standard modular sizes for components to facilitate easy assembly and integration.
• Maintain dimensional tolerances to ensure fit and function.
• Coordinate beam and truss sizes with adjoining structural elements (columns, slabs).

Typical Beam Depth Formula (for design reference):

[ d = \frac{L}{10} \text{ to } \frac{L}{15} ] Where:

• (d) = effective depth of beam
• (L) = span length

Visual Summary (Mermaid Diagram):

graph TD
    A[Structural Components] --> B[Beams]
    A --> C[Trusses]
    B --> D[

IS 7564 (Part 1) - Key Recommendations for Columns and Load Bearing Walls

1. Scope (Clause 1.1)

• Covers coordinating dimensions for structural elements including columns and load bearing walls.
• Ensures functional integration with foundation, floors, roofs, beams, etc.

2. Coordinating Dimensions (Table 1 Highlights)

• Columns and Load Bearing Walls fall under Functional Group 1 - Structure.
• Dimensions to be coordinated with adjoining elements like foundations, floors, and beams.
• Typical dimension parameters:
  • Length & Width: As per structural design and modular coordination.
  • Height/Depth/Thickness: Based on load requirements and architectural constraints.
• Recommended to use modular increments (e.g., multiples of 50 mm or 100 mm) for ease of construction and material optimization.

3. General Specifications

• Column size should align with beam and slab sizes for smooth load transfer.
• Load bearing walls thickness must consider structural loads and architectural openings.
• Use standard grading for components:
  • Grade A: Primary structural members (columns, beams)
  • Grade C: Accessories and reinforcements

4. Practical Notes

• Refer to IS 456 for detailed design formulas (e.g., axial load capacity, slenderness limits).
• Ensure cross-referencing with other functional groups for services and finishes.

Example: Column Load Capacity (IS 456)

[ P_{u} = 0.4 f_{ck} A_c + 0.67 f_y A_s ] Where:

• (P_u) = Ultimate load capacity
• (f_{ck}) = Characteristic compressive strength of concrete
• (A_c) = Area of concrete
• (f_y) = Yield strength of steel
• (A_s) = Area of steel reinforcement

flowchart TD
    A[Foundation] --> B[Column]
    B --> C[Beam]
    C --> D[Slab]
    B --> E[Load Bearing Wall]
    E --> F[Roof]

Summary: IS 7564 (Part 1) emphasizes modular coordination of column and load bearing wall dimensions with other structural components to ensure functional and structural integrity. Use standard grading and modular sizes for efficient design and construction.

IS 7564 Part 1 (1974) — Recommendations for Staircases, Ramps, and Raker Beams

Key Points:

• The code provides co-ordinating dimensions for structural elements including staircases, ramps, and raker beams under Functional Group 1 - Structure.
• Dimensions cover length, width, height, and thickness/depth for components to ensure modular coordination.

Staircases & Ramps (General Recommendations):

• Width: Should allow comfortable passage; typical minimum width is 900 mm for residential, 1200 mm for public buildings.
• Riser Height: Recommended between 150 mm to 175 mm.
• Tread Depth: Minimum 250 mm for comfortable footing.
• Slope of Ramps: Usually between 1:12 to 1:15 for accessibility.
• Headroom: Minimum 2.1 m clearance.

Raker Beams:

• Used to support stair flights; coordinate thickness and depth with slab and beam sizes.
• Depth typically matches the floor beam depth for structural continuity.
• Thickness depends on load and span, generally 150 mm to 300 mm.

Coordination Table (Excerpt Style):

“Selected” means these dimensions are coordinated with adjoining components.

Summary Diagram of Staircase Components:

flowchart TD
    A[Landing] --> B[Riser (150-175 mm)]
    B --> C[Tread (min 250 mm)]
    C --> D[Raker Beam (supports stairs)]
    D --> E[Floor Beam]
    A --> F[Headroom (min 2.1 m)]

Note: For detailed dimensional coordination, refer to Table 1 of IS 7564 Part 1 for exact modular sizes and cross-references to other functional groups like finishes and services.

IS 7564 Part 1 (1974) – Integration with Other Functional Groups: Key Points

1. Functional Groups Overview (Clause 2.2)

• Group 1: Structure
• Group 2: External envelope
• Group 3: Internal subdivision
• Group 4: Services and drainage
• Group 5: Fixtures, furniture, and equipment

2. Co-ordinating Dimensions (Clause 4.1 & Table 1)

• The code provides recommended coordinating dimensions (length, width, height, depth/thickness) for structural components to ensure seamless integration with other functional groups.
• Dimensions are graded (A, C, etc.) indicating precision or importance.
• Cross-references to other groups ensure compatibility (e.g., floors coordinate with internal subdivision and services).

3. Example Extract from Table 1 (Structural Elements)

4. Practical Use

• Use these coordinating dimensions as nominal sizes for structural components.
• Ensures modular coordination and compatibility with architectural, service, and finishing elements.
• Facilitates standardization and reduces conflicts during construction.

Summary Diagram of Functional Group Coordination

graph LR
  A[Functional Group 1: Structure] --> B[Functional Group 2: External Envelope]
  A --> C[Functional Group 3: Internal Subdivision]
  A --> D[Functional Group 4: Services & Drainage]
  A --> E[Functional Group 5: Fixtures & Equipment]

IS 7564 Part 1: Tolerances and Allowances Key Points

Definitions:

• Basic Size (Clause 2.9): Reference size fixing limits of size.
• Co-ordinating Space (Clause 2.7): Space allocated to a component including tolerances and joint clearances.

Grading of Components (Clause 3.1):

• Grade A: Essential dimensional coordination.
• Grade B: Sometimes requires coordination.
• Grade C: No dimensional coordination required.

Recommended Co-ordinating Dimensions (Clause 4.1, Table 1):

Notes:

• Grade A components have strict dimensional controls on length, width, and thickness.
• Grade C components (e.g., reinforcement bars) have no coordination requirements.
• Thickness/depth is often the critical dimension for foundations and slabs.

Summary Table for Co-ordinating Dimensions (Excerpt):

This ensures dimensional compatibility and functional assembly in building structures.

flowchart TD
    A[Basic Size] --> B[Co-ordinating Space]
    B --> C{Component Grading}
    C -->|A| D[Strict Dimensional Control]
    C -->|B| E[Partial Control]
    C -->|C| F[No Dimensional Control]
    D --> G[Length, Width, Thickness]
    F --> H[

IS 7564 Part 1 (1974) — Key References & Specifications

• Scope: Co-ordinating dimensions for Functional Group 1 - Structure (foundations, floors, roofs, beams, columns, walls, stairs, etc.)

• Cross References to Related Standards:

  • BSPD 6432 Part 1 & Part 2 (British Standards on coordination of building dimensions)
  • Other Indian Standards on modular co-ordination (series of IS 7564)

• Key Table: Recommended Co-ordinating Dimensions (Table 1)

• Notation:

  • ✓ = Coordinating dimension applicable
  • "-" = Not applicable
  • Grades A, C indicate quality/accuracy levels

• Purpose:
  Establish dimensional correlation between components to ensure functional integration.

Summary Diagram of Functional Group 1 Components Coordination

graph TD
  A[Foundation (Grade C)] --> B[Floors (Grade A)]
  B --> C[Roof (Grade A)]
  B --> D[Structural Beams (Grade A/C)]
  C --> D
  D --> E[Concrete Reinforcement (Grade C)]

Use this as a guide for dimensional coordination and cross-reference with BSPD 6432 and related IS standards for detailed modular co-ordination.

IS 7564 Part 1 (1974) - Annexures & Illustrations Summary

Key Specification:

Clause 4.1 covers Recommended Co-ordinating Dimensions for building components in Functional Group 1 - Structure.

Table 1: Co-ordinating Dimensions of Structural Components

• Grading: A (Primary), C (Secondary)
• Dimensions marked "Selected" indicate key coordinating dimensions for modular coordination.
• Depth/Thickness is critical for foundations, slabs, beams, and formwork.

Usage Notes:

• Net sizes of formwork are derived from component sizes.
• Coordination ensures modular compatibility and reduces construction errors.
• Cross references link structural components to architectural and services groups.

flowchart TD
    A[Foundation] --> B[Floors]
    B --> C[Roof]
    C --> D[Structural Beams]
    D --> E[Formwork]
    E --> F[Concrete Reinforcement]
    style A fill:#f9f,stroke:#333,stroke-width:2px
    style F fill:#bbf,stroke:#333,stroke-width:2px

For detailed dimensions, refer to **Table 1 in IS 756