Clay roofing country tiles, half round and flat tiles -Specification

IS 13317: Scope - Key Specifications & Tables for Clay Country Roofing Tiles

Scope: Covers dimensions, classification, and conformity criteria for half round and flat clay roofing tiles.

1. Tile Dimensions (Clause 6.1, Table 2 & 7.5.1)

Additional dimensions (a, b, c, d, e) for laying patterns are provided for precise fitting.

2. Classification (Clause 4.1, Table 1)

3. Conformity Criteria (Clause 7.5)

• Lot accepted if all testing criteria (dimensions, water absorption, breaking load) meet specified limits.
• Rounding off values per IS 2:1960 rules.

Summary Diagram: Tile Dimensions and Classification

graph TD
A[Clay Roofing Tiles] --> B[Half Round Tile]
A --> C[Flat Tile]

B --> B1[Size I: 200x105/

IS 13317 - Referenced Standards: Key Specifications & Tables

1. Tile Dimensions (Clause 6.1, Table 2)

2. Detailed Dimensions (Clause 7.5.1)

3. Conformity Criteria (Clause 7.5)

• Lot conformity depends on satisfying conditions in Clauses 7.5.2 to 7.5.5.
• Sample sizes and acceptance criteria detailed in Table 3 (not fully provided here).

4. Testing & Quality Control

• Breaking load strength measured as per Fig. 2 (2B Upper Bearing setup).
• Final test results rounded per IS 2:1960 rules.
• Products with BIS Standard Mark comply with inspection, testing, and quality control.

Summary Diagram: Tile Dimensions Overview

graph TD
    A[Tile Type] --> B[Half Round Tile]
    A --> C[Flat Tile]
    B --> B1[Size I: 200x105x85 mm]
    B --> B2[Size II: 250x

IS 13317: Definitions & Key Specifications for Clay Country Roofing Tiles

1. Definitions Reference

• Clause 3.1: Definitions as per IS 2248:1991 apply to this standard.

2. Tile Classification (Table 1, Clause 4.1)

• Individual breaking load is slightly less than average (e.g., 0.35 kN for Class AA Half Round).

3. Tile Dimensions (Table 2 & Clause 6.1)

4. Detailed Dimensions (Clause 6.1)

IS 13317: Classification of Clay Country Roofing Tiles

1. Classification (Clause 4.1)

Tiles are classified into two types and two classes:

2. Dimensions (Clause 6.1)

Summary

• Class AA tiles have stricter water absorption and breaking load requirements than Class A.
• Tiles are available in two sizes (I and II) with specified length and width.
• Breaking load is critical for durability; water absorption affects weather resistance.

flowchart TD
    A[Clay Country Roofing Tiles]
    A --> B[Half Round Tile]
    A --> C[Flat Tile]
    B --> B1[Class AA: Abs ≤ 19%, Load Avg ≥ 0.40 kN]
    B --> B2[Class A: Abs ≤ 24%, Load Avg ≥ 0.30 kN]
    C

IS 13317: General Quality Requirements for Country Roofing Tiles

Key Specifications (Clause 6.1 & 7.5)

1. Tile Dimensions (Table 2 & Clause 6.1)

2. Detailed Dimensions (Clause 7.5.1)

3. Sampling and Acceptance Criteria (Clause 7.3)

4. Tile Classes (Clause 4.1)

• Tiles are classified into Class AA and Class A based on quality.

Summary:

• Tiles must conform to

IS 13317 - Dimensions and Tolerances for Country Tiles

Key Dimensions (Table 2)

Tolerances (Clause 6.2)

• Length and width tolerances: ±5% of the specified dimensions.

Additional Specifications

• Maximum corner gap when placed on a plane surface: 8 mm (Clause 5.3).
• Cross-section must ensure structural rigidity.

Summary Formula for Tolerance Limits:

[ \text{Tolerance} = \pm 0.05 \times \text{Dimension} ]

Example: For a 200 mm length tile, tolerance = ±10 mm.

flowchart LR
    A[Tile Dimensions] --> B[Length & Width]
    B --> C{Tolerance ±5%}
    C --> D[Max Gap at Corners ≤ 8 mm]
    D --> E[Structural Rigidity Ensured]

This ensures tiles fit well with minimal gaps and maintain strength.

IS 13317: Sampling and Criteria for Conformity

1. Sampling Plan (Clause 7.3)

• If defective tiles ≤ permissible number, lot conforms.

2. Dimensions of Tiles (Clause 6.1 & 7.5.1)

3. Criteria for Conformity (Clause 7.5)

• Lot is conforming if all conditions in Clauses 7.5.2 to 7.5.5 are met:
  • Dimensions within tolerance
  • Visual quality
  • Physical properties
  • Number of defective tiles ≤ permissible limit

Summary Diagram: Sampling Decision Flow

flowchart TD
    A[Start: Lot Size Known] --> B{Lot Size}
    B -->|≤2000| C[Sample 22 Tiles]
    B -->|2001-5000| D[Sample 35 Tiles

IS 13317 - Strength Requirements for Clay Country Roofing Tiles

Key Strength Criteria (Clause 7.5.4 & Table 1)

• All individual breaking load test results must exceed the individual minimum.
• The average of six tests must exceed the average minimum.

Breaking Load Test Setup (Clause 8.2, Annex B)

• Specimen is loaded until failure using a standard bearing setup (see FIG. 2 in IS 13317).
• Load is applied centrally on the tile to determine breaking load.

Summary:

• Minimum breaking load depends on tile type and class.
• Testing involves 6 specimens; both individual and average loads must meet criteria.
• Ensures quality and durability of roofing tiles under load.

flowchart TD
    A[Test 6 Specimens] --> B{Each Specimen Breaking Load}
    B --> |≥ Individual Min| C[Pass Individual Criteria]
    B --> |< Individual Min| D[Fail]
    C --> E[Calculate Average]
    E --> |≥ Average Min| F[Pass Overall Strength]
    E --> |< Average Min| G[Fail]

This ensures compliance with IS 13317 strength requirements for clay roofing tiles.

IS 13317: Non-Compliance with Tests — Key Points

1. Breaking Load Test (Clause 8.2)

• Tiles must meet breaking load values as per Table 1 (Annex B procedure).
• Breaking load ensures mechanical strength compliance.

2. Criteria for Conformity (Clause 7.3, Table 7.5)

• If defective tiles exceed permissible limits, the lot is non-compliant.

3. Tile Dimensions (Clause 6.1, Table 2)

Summary:

• Test samples and defect limits per lot size control acceptance.
• Breaking load tests ensure strength.
• Dimensional checks per Table 2 ensure size conformity.

flowchart TD
    A[Lot of Tiles] --> B{Sample Size per Lot}
    B -->|Within Permissible Defects| C[Lot Accepted]
    B -->|Exceeds Permissible Defects| D[Lot Rejected]
    A --> E[Breaking Load Test]
    E -->|Meets Criteria| C
    E -->|Fails| D

Use these tables and clauses for quality control and acceptance criteria per IS 13317.

IS 13317 - Marking Specifications for Roofing Tiles

Clause 10.1: Marking Requirements

• Each roofing tile must be legibly and indelibly marked with the source of manufacture.
• Marking area shall not exceed 5% of the tile surface.

Clause 10.1.1: Standard Mark

• Tiles may also carry the BIS Standard Mark, indicating conformity to IS 13317.
• The Standard Mark assures compliance with quality and inspection norms.

Key Dimensions (Clause 6.1, Table 2)

Summary

• Marking ensures traceability and quality assurance.
• Marking size ≤ 5% of tile area.
• BIS Standard Mark indicates certified compliance.
• Refer to Table 2 for tile dimensional standards.

flowchart LR
    A[Roofing Tile] --> B[Marking]
    B --> C{Marking Type}
    C --> D[Source of Manufacture]
    C --> E[Standard Mark (optional)]
    B --> F[Max 5% tile area]

IS 13317: Water Absorption Test for Tiles

Key Formula (Clause 3.1)

[ \text{Percentage Absorption} = \frac{B - A}{A} \times 100 ]

• A = Weight of dry specimen (g)
• B = Weight after 24 hours immersion in cold water (g)

Statistical Evaluation (Clause 7.5.3)

• Calculate average absorption, ( X )
• Calculate range, ( R )
• Ensure:
  [ X + 0.5R \leq \text{Limit from Table 1} ]

Specifications (Clause 8.1 & Table 1)

• Water absorption must meet limits in Table 1 (not provided here, typically varies by tile type)
• Test procedure per Annex A

Test Procedure Summary (Annex A)

• Specimens dried and weighed (A)
• Immersed in cold water for 24 hours
• Weighed again (B)
• Calculate absorption using formula above

Practical Notes

• Use dry specimens with no surface moisture.
• Ensure complete immersion.
• Typical absorption limits range from 0.5% to 10% depending on tile type (ceramic, vitrified, etc.).

flowchart TD
    A[Dry Specimen] -->|Weigh| B[Weight A]
    B --> C[Immerse 24h in Cold Water]
    C --> D[Weigh Wet Specimen]
    D --> E[Weight B]
    E --> F[Calculate % Absorption = (B-A)/A * 100]
    F --> G[Check if (X + 0.5R) ≤ Limit from Table 1]

This ensures tile quality and durability against moisture ingress.

Breaking Load Test Procedure (IS 13317)

Key Points from IS 13317:

• Test Specimens:

  • 3 tiles tested separately in wet and dry conditions (Clause B-4.1).
  • Record individual breaking loads and calculate average.

• Test Setup:

  • Use a 1000 kgf proving ring with dial gauge for load measurement.
  • Components: tapered wooden plate, half-round tile, lower bearing roller, rigid MS plate, screw action for vertical loading.

• Acceptance Criteria (Clause 7.5.4 & Table 1):

  • Each individual breaking load ≥ minimum specified in Table 1.
  • Average of six tests (3 wet + 3 dry) ≥ minimum average specified in Table 1.

Typical Breaking Load Test Setup (Annex B):

graph LR
A[Load Application] --> B[Tapered Wooden Plate]
B --> C[Tile (Half Round)]
C --> D[Lower Bearing Roller]
D --> E[Rigid MS Plate]
E --> F[Proving Ring + Dial Gauge]

Summary Table (Example format for Table 1):

(Refer to actual IS 13317 Table 1 for exact values)

Formula:

[ \text{Average Breaking Load} = \frac{\sum_{i=1}^6 \text{Breaking Load}_i}{6} ]

• All individual values must be ≥ minimum individual limit.
• Average must be ≥ minimum average limit.

Ensure: Test conditions, specimen preparation, and equipment calibration follow IS 13317 Annex B for valid results.