What is the primary purpose of IS 3978?

It outlines the recommended manufacturing processes and best practices for producing burnt clay Mangalore pattern roofing tiles.

Does this standard contain the strength or water absorption limits for the tiles?

No, product specifications and physical testing requirements are detailed in IS 654.

Why is the weathering of clay emphasized?

Weathering breaks down hard lumps and improves the overall plasticity and workability of the clay, which is crucial for achieving the distinctive Mangalore tile pattern without defects.

IS 3978

: 1967

Manufacture of burnt clay Mangalore pattern roofing tiles- Code of practice

CurrentSpecializedCode of PracticeMaterials Science · Clay and Stabilized Soil Products

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This standard provides a comprehensive code of practice for the manufacturing process of burnt clay Mangalore pattern roofing tiles. It covers critical stages from raw material selection and clay preparation (weathering, pugging) to the moulding, controlled drying, and firing (burning) processes required to produce high-quality roofing tiles.

Manufacture of burnt clay Mangalore pattern roofing tiles- Code of practice

Quick Reference Values

Typical firing temperature for clay tiles800 - 1000 °C

Typical moisture content for pugging15 - 20 %

Typical weathering duration for raw clay3 - 6 months

Practical Notes

This code acts as a manufacturing guide; for the physical specifications, testing, and acceptance criteria of the finished tiles, refer to IS 654.

Adequate weathering of clay is highly recommended to improve plasticity, remove impurities, and ensure uniform tile pressing.

Drying must be gradual and protected from direct sunlight and strong drafts to prevent warping and cracking prior to firing.