What is the maximum allowed water absorption for polished granite?

Maximum 0.50% by mass, as specified in Table 1.

What is the minimum required strength (Modulus of Rupture) for granite flooring?

12.0 N/mm² for 'General Use' which includes flooring, as per Table 1.

What is the standard thickness tolerance for a 20mm thick granite slab?

± 1.0 mm for slabs up to 30 mm thick, according to Clause 5.3.1.

How is the abrasion resistance of granite specified?

The 'Resistance to Wear' should be a maximum of 1.0 mm when tested as per IS 13630 (Part 3).

IS 14223

: 2000

polished building stones, Part 1: Granite

CurrentSpecializedSpecificationBIMMaterials Science · Stones

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This standard (Part 1) specifies the requirements for polished granite blocks, slabs, and tiles used as building stones. It outlines the material's dimensional tolerances, physical properties (like water absorption, strength, abrasion resistance), finish, and methods for sampling and testing.

polished building stones, Part 1: Granite

Quick Reference Values

Maximum Water Absorption0.50 % by mass

Minimum Modulus of Rupture (General Use)12.0 N/mm²

Minimum Modulus of Rupture (Lining)10.0 N/mm²

Maximum Resistance to Wear / Abrasion1.0 mm

Thickness Tolerance (up to 30 mm)± 1.0 mm

Flatness Tolerance (Diagonal > 1500 mm)± 3.0 mm

Practical Notes

The code provides different minimum strength (Modulus of Rupture) values for 'General Use' (e.g., flooring) and 'Lining' (e.g., wall cladding).

Always verify supplier test certificates against the physical properties in Table 1, especially for water absorption and abrasion resistance in high-traffic or wet areas.

Pay close attention to dimensional and flatness tolerances (Clause 5) during quality checks to prevent installation issues like lippage and uneven joints.