How is water permeability tested for these tiles?

A water column is maintained over the tile face for 24 hours to ensure no water drops fall from the underside.

What types of cement are permissible for tile manufacturing?

Ordinary Portland Cement (IS 269), Portland Slag Cement (IS 455), and Portland Pozzolana Cement (IS 1489) are permitted.

Are color pigments allowed in plain concrete tiles?

Yes, provided they are durable, weather-resistant mineral pigments that do not negatively affect the strength of the tile.

IS 4321 Part 2

: 1992

Concrete roofing tiles - Part 2: Interlocking tiles

CurrentSpecializedSpecificationArchitectural · Roofing Materials

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This standard (Part 2) prescribes the manufacturing criteria, material specifications, dimensions, tolerances, and physical testing requirements specifically for interlocking concrete roofing tiles.

Specifies requirements for interlocking concrete roofing tiles.

Quick Reference Values

Permeability test duration24 hours without water drop formation on underside

Typical plain tile length250 mm or 300 mm

Minimum thickness9.5 mm (nominal)

Key Formulas

Water Absorption (%) = [(M2 - M1) / M1] x 100

Practical Notes

Ensure strict adherence to dimensional tolerances; irregular tiles lead to improper overlapping and potential roof leaks.

When colored tiles are required, only durable, weather-resistant mineral pigments should be used so they do not degrade the structural integrity of the concrete.

Proper curing of the manufactured tiles is crucial to achieve the desired transverse strength and to prevent excessive efflorescence.