What is the maximum allowed water absorption for machine-made terracing tiles?

The maximum permissible water absorption is 15% by weight after 24 hours of cold water immersion.

How is the strength of the terracing tile measured?

Strength is measured via a breaking load test where a line load is applied to the center of the tile supported on two parallel rollers.

What is the acceptable limit for efflorescence?

The efflorescence should not be more than 'Slight', meaning salt deposits cover less than 10% of the exposed area.

IS 2690 Part 2

: 1993

Burnt clay flat terracing tiles - Part 2: Machine-made

CurrentSpecializedSpecificationMaterials Science · Roofing Materials

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This standard specifies the dimensions, physical requirements, and testing procedures for machine-made burnt clay flat terracing tiles used primarily for roof terracing and waterproofing applications.

Specifies requirements for machine-made burnt clay flat terracing tiles.

Quick Reference Values

maximum water absorption15% by weight

standard thicknesses15 mm and 20 mm

efflorescence limitNot more than Slight

minimum breaking loadDepends on size (typically around 700 N for machine-made)

Practical Notes

Machine-made tiles offer tighter dimensional tolerances and lower water absorption compared to hand-made tiles (covered in Part 1).

Tiles must be thoroughly soaked in water before laying to prevent them from absorbing moisture from the mortar bed, which can cause shrinkage cracks.

Efflorescence testing is critical to ensure aesthetic longevity and prevent salt weathering on exposed terraces.