Summaries of Indian Standards for Building Materials

Scope Summary from IS SP Part 21

• Clause 4.3 (Dimensions): Refer to Table 1 for standard dimensional data of structural elements.

• Clause 10.0 (Masses): Mass values are detailed in Tables 1 to 4 for different profiles and sizes.

• Clause 2.1 (Designation Table): Lists standard designations with dimensions (e.g., 110(5), 100(4), 80(4.5), etc.), where numbers denote size and thickness in mm.

• Clause 8.0 (Dimensions Table): Provides dimensions for various sizes (e.g., 175, 200, 225 mm) with corresponding thickness options (3.65 to 12.5 mm).

Key Tables Extract (Dimensions & Thickness)

Usage Notes:

• Use Table 1 for selecting dimensions based on designation.
• Masses for design calculations are in Tables 1-4.
• Thickness and width combinations guide structural element selection.

flowchart LR
  A[Designation] --> B[Refer Table 1 for Dimensions]
  B --> C[Select Thickness & Width from Clause 8.0 Table]
  C --> D[Check Masses in Tables 1-4]
  D --> E[Use for Structural Design]

This concise scope helps in selecting standard sizes and thickness

Key Specifications for Materials and Grades (IS SP Part 21)

1. Chemical Composition (Ladle Analysis) — Table 1

2. Tensile Properties — Table 2

3. Chemical Composition (Product Analysis) — Clause 3.2

Permissible Variation (Max %):

IS SP Part 21: Dimensions and Tolerances

Based on Clauses 2.3, 2.7, 2.8, and 2.9, the key points for Dimensions and Tolerances are:

1. Standard Shapes and Sizes

• Standardized cross-sectional shapes (e.g., channels, angles, beams) with specified nominal dimensions.
• Dimensions include depth (d), width (b), thickness (t), and length (L).

2. Dimensional Tolerances

• Tolerances define permissible deviations from nominal sizes.
• Typical tolerances for structural steel sections:

3. Tolerance on Angles and Straightness

• Angular tolerance: ±1° to ±2° depending on section size.
• Straightness tolerance: deviation ≤ 1/1000 of length.

4. General Notes

• Tolerances ensure interchangeability and fit.
• Manufacturing processes influence achievable tolerances.

Summary Table of Dimensional Tolerances:

flowchart LR
    A[Nominal Dimension] --> B[Manufacturing]
    B --> C[Dimensional Tolerance Applied]
    C --> D[Final Product Dimension]
    D --> E[Fit & Interchangeability]

This ensures structural steel members conform to IS standards for safe and reliable construction.

IS SP Part 21: Key Physical & Mechanical Requirements

1. Mechanical Properties (Clause 1.2, Table 2)

2. Physical Properties of Low Density Particle Boards (Clause 6.2, Table 1)

3. Rubber Types Mechanical Properties (Clause 3.4, Table 2)

| Polymer Type | Tensile Strength (MPa, Min) | Elongation at Break (%) Min | |-----------------------|-----------------------------

IS SP Part 21: Testing Methods - Key Formulas, Tables & Specs

1. Tensile Test (Clause 9.1)

• Refer Table 2 for tensile strength requirements.
• Tensile strength = Load at failure / Cross-sectional area.

2. Bitumen Properties (Clause 3.1)

• See Table 1 for bitumen specifications.
• Testing methods per IS 1203, 1205, 1208, 1212, 1216 (1978 editions).

3. Deflection Under Test Load (Clause 5.1)

4. Thermal Conductivity (Clause 5.2)

• Max 0.08 W/mºK.

5. Sound Absorption (Clause 5.3)

IS SP Part 21: Performance Criteria Summary

1. Deflection Under Test Load (Clause 5.1)

• Deflection limits depend on Type, Size, Thickness, Test Load, and Test Span.
• Example limits:

2. Thermal Conductivity (Clause 5.2)

• Maximum thermal conductivity: 0.08 W/mºK

3. Sound Absorption (Clause 5.3)

• Minimum sound absorption coefficient for 25 mm thickness with rigid backing:

4. Weight of Slab (Max) by Thickness

5. Dimensions (Clause 4.3)

• Refer to Table 1 for detailed dimensional specifications.

Summary Diagram: Deflection Criteria

graph LR
A[Type & Size] --> B[Test Load & Span]
B --> C[Max Deflection Limit]
C --> D[Performance Compliance]

For

IS SP Part 21: Marking and Identification Key Points

Designation System (Clause 2.1):
The product is identified by a five-block code separated by asterisks *:
Block 1* Block 2* Block 3* Block 4* Block 5*

• Block 1: IS specification number (e.g., IS SP Part 21)

• Block 2: Product general description
  Format: PC + number of layers + cross-section type + surface texture
  Example: PC2NP (Polycarbonate, 2 layers, hollow N-profile, polished surface)
  Refer Table 1 for codes.

• Block 3: Material and surface properties (4 letters)
  1st: Light stabilization (L/X/O)
  2nd: Coating (H/U/O)
  3rd: Transparency (T/R/Q/O)
  4th: Colour (C/N/O)
  Example: LHQC = Light stabilized, Hard coating, Transparent, Coloured
  Refer Table 2.

• Block 4: Four digits representing:

  1. Weight per sq. m (kg/m²)
  2. Dart drop impact (J)
  3. Light transmission (%)
  4. Flammability rating
     See Table 3 for code mappings.

• Block 5: Additional specific performance (optional)
  Codes:

  • V = vandalism resistance
  • F = forced entry resistance
  • B = bullet resistance
  • E = explosion resistance
    Format: Letter + digit indicating resistance level (see Tables 4-7).

Important Tables Summary

IS SP Part 21: Preservative and Protective Treatments – Key Points

1. Types of Preservatives & Modes of Treatment (Clause 12.0, Table 5)

2. Penetration Depth of Preservatives (Clause 5.2, Table 3)

*Incision of ~15 mm recommended on structural members for absorption.

3. Retention Recommendations for Structural Members (Clause 5.1)

• Structural members & shell members:
  • 12 kg/m³ with CCA or ACC
  • 16 kg/m

IS SP Part 21: Installation and Application Guidelines - Key Formulas & Tables

1. Deflection Under Test Load (Clause 5.1)

Maximum allowable deflection for various sheet types, sizes, and thicknesses under specified test loads and spans:

2. Physical & Material Requirements (Table 3)

IS SP Part 21: Sampling and Inspection - Key Points

1. Product Analysis Tolerances (Table 2)

2. Defect Classification (Clause 2.2.3)

3. Permissible Defects & Blemishes (Table 1)

• Warpage: ≤ ±2% on all planes or 10 mm (whichever is less)
• Spots & Blisters: Max 6 (general), max 8 (service space)
• Bubbles, Pinholes, Specks: Max 3 in one pottery, max 10 total on visible surfaces
• Polishing Marks & Exposed Bodies: Max 4

4. Workmanship & Finish

• Finished materials must be free from defects detrimental to usage.
• Defects in the first and last 1 m of coil length are ignored.

Summary Diagram of Inspection Flow

flowchart TD
    A[Sampling] --> B[Product Analysis]
    B --> C{Within Permissible Variation?}
    C -- Yes --> D[Check Defects]
    C -- No --> E[Reject / Reprocess]
    D --> F{Defects Acceptable?}
    F -- Yes --> G[Accept Material]
    F -- No --> E

This ensures material quality meets IS standards for chemical composition and surface integrity.

IS SP Part 21: Packaging and Storage Key Points

Clause 4.3 - Covering Strength

• Covering must be strong enough to withstand normal handling, storage, and use without damage.

Packaging Specifications (Corrugated Bitumen Roofing Sheets)

Table 2: Weight of Sheets

Storage Recommendations

• Store sheets flat and dry to prevent deformation.
• Avoid exposure to direct sunlight or moisture to maintain bitumen quality.
• Use adequate support to prevent sagging or bending.
• Cover stacks with strong, weather-resistant materials.

Physical Requirements (Table 3 Summary)

IS SP Part 21: Safety and Environmental Considerations

Key Specifications & Tables:

• Clause 2.1 Table (Designation & Thickness in mm):
  This table lists material thicknesses and designations (e.g., 110(5), 80(4.5)) relevant for structural safety. The numbers represent thickness in mm and corresponding strength/designation.

• Clause 10.0:
  Refer to Tables 1 to 4 for mass values essential for load and safety calculations.

• Clause 4.3 (Dimensions):
  Dimensions for components are standardized in Table 1 ensuring compatibility and safety.

• Clause 3.1 (Openings - Doors, Windows, Ventilators, Fixed Lights):
  Specifies standard sizes and types (e.g., 6 HS 20 for doors, 5 HF 6 for fixed lights) crucial for ventilation, emergency exits, and environmental control.

Safety & Environmental Design Considerations:

• Material Thickness & Strength: Use the thickness/designation table (Clause 2.1) to select materials ensuring structural integrity under environmental loads.

• Mass & Load Calculations: Use Tables 1-4 (Clause 10.0) for accurate mass estimation to design safe supports and foundations.

• Ventilation & Lighting: Standardized sizes (Clause 3.1) ensure adequate natural ventilation and lighting, reducing energy consumption and improving safety.

Example: Material Selection Check

flowchart TD
    A[Material Selection] --> B[Check Thickness (Clause 2.1)]
    B --> C[Calculate Mass (Tables 1-4)]
    C --> D[Design Openings (Clause 3.1)]
    D --> E[Ensure Safety & Environmental Compliance]

Summary: Use Clause 2.1 for material thickness, Clause 10.0 for mass, and Clause 3.1 for openings to ensure safety and environmental standards in design per IS SP Part 21.

IS SP Part 21: Key References and Specifications

• Masses: Refer Tables 1 to 4 for mass properties of materials/components. These tables provide standard weights essential for load calculations.

• Materials: Clause 6.3 directs to details on materials, including specifications, grades, and properties. This is crucial for selecting appropriate materials in design.

• Wall Thickness: Clause 5.2 specifies wall thickness requirements. Refer Tables 3, 4, and 5 for thickness values based on design parameters like pressure, diameter, and material grade.

Typical Table References (Summary):

Important Formula (Example for Wall Thickness):

[ t = \frac{P \times D}{2 \times \sigma \times E + P} ]

• t = required wall thickness
• P = design pressure
• D = outside diameter
• σ = allowable stress
• E = joint efficiency

For detailed design, always cross-check with the exact tables and clauses mentioned in the standard.

IS SP Part 21 - Key Annexures & Tables Summary

1. Masses Reference

• Clause 10.0: Refer to Tables 1 to 4 for masses of different components.

2. Timber Designation & Properties (Clause 2.1)

| Designation (Density in kg/m³) | Examples: 110(5), 100(4), 90(3.15), 80(4.5), 70(2.5), 60(3.15), 50(2), 45(3.15), 40(2), 35(2), 30(2), 25(1.6) |

• Numbers indicate density and strength class.

3. Joinery Sizes (Clause 3.1 - Doors, Windows, Ventilators, Fixed Lights)

• Door sizes: e.g., 6 HS 20, 8 HS 20, 10 HS 20, 12 HS 20
• Window sizes: e.g., 5 HS 9, 10 HS 9, 15 HS 9
• Ventilators and fixed lights follow similar size codes (HT, HC, HF).

4. Dimensions of Doors, Windows, and Ventilators (Clause 4.1, Table 1)

Additional Notes:

• Classification and permissible moisture content for timber are specified in annexures.
• Seasoning and preservation guidelines for timber are provided for durability

IS SP Part 21: Definitions & Terminology - Key Tables & Specifications

1. Dimensions & Diameters (Clause 4.3 & 5.1)

• Refer Table 1 for Specified Inside Diameters (ID) and tolerances:

(Full table in the standard; tolerances vary with size)

2. Masses (Clause 10.0)

• Mass values for components are listed in Tables 1 to 4 (refer to the standard for specifics).

3. Designation (Clause 2.1)

• Designations given as Diameter (mm) (Thickness in mm), e.g., 110 (5), 80 (4.5), 25 (1.6).

Summary:

• Nominal Diameter (DN) defines pipe size.
• Inside Diameter (ID) has specified ranges with tolerances.
• Thickness and designation are standardized.
• Masses are tabulated separately.

For detailed design, always cross-check exact values from IS SP Part 21 tables.

flowchart LR
    A[Nominal Diameter DN] --> B[Inside Diameter Range (ID)]
    B --> C[Tolerance on ID]
    A --> D[Designation: Diameter (Thickness)]
    A --> E[Mass Tables 1-4]

This diagram shows relationships between key parameters.