The 1992 edition of IS 13317 outlines the specifications for handmade clay roofing country tiles, including both half round and flat variants commonly used throughout India. It details classification criteria, precise dimensions, permissible tolerances, physical and mechanical properties such as water absorption and breaking strength, along with quality assurance protocols. This standard is essential for manufacturers, inspectors, and engineers engaged in the production, testing, and application of durable clay roofing tiles.
Overview
The 1992 edition of IS 13317 outlines the specifications for handmade clay roofing country tiles, including both half round and flat variants commonly used throughout India. It details classification criteria, precise dimensions, permissible tolerances, physical and mechanical properties such as water absorption and breaking strength, along with quality assurance protocols. This standard is essential for manufacturers, inspectors, and engineers engaged in the production, testing, and application of durable clay roofing tiles.
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Frequently Asked
As per IS 13317, the maximum permissible water absorption rates for clay country roofing tiles are: for Class AA half round and flat tiles, up to 19%; and for Class A half round and flat tiles, up to 24%. Testing involves drying six samples to constant weight and measuring absorption after 24 hours immersion in water. Lower absorption values indicate improved durability and weather resistance.
The breaking load test specified in IS 13317 requires testing six tiles — three in wet condition (soaked for 24 hours at 27 ± 2°C) and three dry. Tiles are supported according to type: half round tiles on a tapered wooden plank, flat tiles on a plywood base. A steel bearer is placed along the tile’s midlength, and load is applied perpendicularly at a controlled rate of 200 to 250 N/min using a screw-operated rig equipped with a proving ring. The breaking load at failure is recorded and reported, including the weight of the steel bearer.
IS 13317 defines two sizes for each tile type. Half round tiles are Size I: 200 mm length × 105 mm wide (wide end) × 85 mm wide (narrow end) and Size II: 250 mm × 120 mm × 95 mm. Flat tiles are Size I: 200 mm length × 175 mm wide (wide end) × 145 mm (narrow end) and Size II: 250 mm × 200 mm × 160 mm. Dimensional tolerances for length and width are ±5% of the specified size, and corner gaps must not exceed 8 mm when tiles are placed on a flat surface, ensuring structural rigidity.
IS 13317 prohibits visible impurities such as stones, lime, or foreign particles on the tile surface or fracture face, except for occasional particles not exceeding 2 mm. Tiles must be sound, producing a ringing sound when struck, and fractures must be clean and sharp. Uniform coloration is mandatory for Class AA tiles. The acceptable number of defective tiles in a sample depends on lot size, with strict limits to ensure quality control.
Conformity is established by sampling a specified number of tiles based on lot size and subjecting them to dimensional, water absorption, and breaking load tests. The lot is deemed conforming if all tiles meet dimensional tolerances, water absorption limits, and strength requirements, and if the number of defective tiles does not exceed the allowable maximum. Sampling sizes and acceptance criteria are defined in the standard to maintain consistent quality.
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