What is the difference between Class A and Class B soling bricks?

Class A has a higher minimum average compressive strength (5.0 N/mm²) and lower maximum water absorption (20%) than Class B (3.5 N/mm² and 25% respectively), as per Table 2.

What are the standard dimensions of a soling brick?

The standard modular sizes are 190 x 90 x 90 mm and 190 x 90 x 40 mm, as specified in Clause 4.1.

Can soling bricks be used for building walls?

No, they are not intended for load-bearing or non-load-bearing masonry. Their primary use is as a base course for floors and pavements.

How is the quality of soling bricks checked on site?

Visually check for uniform shape, size, and colour. Tap two bricks together; a clear ringing sound indicates good quality, while a dull thud suggests defects. Laboratory tests for strength and absorption are required for formal acceptance as per Clause 8.

IS 5779

: 1986

burnt clay soling bricks - Specification

CurrentFrequently UsedSpecificationBIMMaterials Science · Clay and Stabilized Soil Products

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This standard specifies the requirements for burnt clay soling bricks, which are used as a base course for ground floors and pavements. It covers classification (Class A and B), dimensions, tolerances, and physical characteristics such as compressive strength, water absorption, and efflorescence.

burnt clay soling bricks - Specification

Quick Reference Values

Standard Brick Size 1190 x 90 x 90 mm

Standard Brick Size 2190 x 90 x 40 mm

Min. Compressive Strength (Class A)5.0 N/mm²

Min. Compressive Strength (Class B)3.5 N/mm²

Max. Water Absorption (Class A)20 % by weight

Max. Water Absorption (Class B)25 % by weight

Efflorescence RatingSlight to Moderate

Practical Notes

Soling bricks are primarily used to create a firm, level base over compacted earth, not for structural masonry walls. Use IS 1077 bricks for walls.

Class A bricks are stronger and less absorbent, making them suitable for industrial floors or areas with potential dampness. Class B is adequate for most residential floors.

Ensure bricks are laid flat (soling) and tightly packed, with joints completely filled with coarse sand or a lean mortar mix to provide a stable sub-base.