What applications does this IS code cover?

It covers limestone slabs and tiles intended for use in flooring, facing, and roofing of buildings.

What is the permissible tolerance on dimensions?

The general tolerance on length, width, and thickness is ± 2 mm to ensure uniformity during jointing.

How is the water absorption of the limestone tested?

It is tested in accordance with IS 1124, which is cross-referenced in this code.

IS 1128

: 1974

Limestone (Slab and Tiles)

CurrentSpecializedSpecificationArchitectural · Stones

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This code establishes the specifications for limestone slabs and tiles, including popular varieties like Kota stone. Engineers and architects use it to verify the dimensions, tolerances, and physical properties required for flooring, roofing, and facing in building construction.

Limestone (Slab and Tiles)

Quick Reference Values

Length range150 mm to 850 mm

Width range150 mm to 600 mm

Standard thicknesses15, 20, 25, 30, 40, and 50 mm

Tolerance on length and width± 2 mm

Tolerance on thickness± 2 mm

Practical Notes

Kota stone is the most widely used limestone variety governed by this code in India.

Thickness tolerance is critical during site execution; uneven thickness leads to lippage in flooring which requires excessive mortar or grinding.

Visual inspection is essential to ensure the stone is free from natural defects such as loose veins (kacha) or cracks before acceptance.