What is the maximum permissible water absorption for sandstone slabs?

The maximum water absorption should not exceed 2.5 percent by mass.

What is the acceptable tolerance for hand-dressed sandstone thickness?

A tolerance of ± 5 mm is generally acceptable for hand-dressed slabs, whereas machine-cut slabs have a tighter tolerance of ± 2 mm.

Which IS code details the testing methods for the physical properties of this sandstone?

IS 1121 (Parts 1 to 4) is used for testing strength, and IS 1124 is used for water absorption.

IS 3622

: 1977

sandstone (slabs and tiles)

CurrentSpecializedSpecificationMaterials Science · Stones

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This standard lays down the requirements for dimensions, physical properties, and workmanship for sandstone slabs and tiles used for flooring, paving, facing, and cladding in building construction.

sandstone (slabs and tiles)

Quick Reference Values

Maximum water absorption2.5% by weight

Minimum modulus of rupture (transverse strength)15 N/mm²

Tolerance on length and width (machine cut)± 2 mm

Tolerance on thickness (machine cut)± 2 mm

Tolerance on thickness (hand dressed)± 5 mm

Practical Notes

Sandstone should always be laid such that its natural bedding plane is perpendicular to the direction of the applied load to prevent delamination.

For cladding purposes, careful checking of thickness tolerances is critical to avoid lippage and ensure a flush finish.

Visual inspection must rule out weathering defects, soft veins, or clay holes which compromise durability.